cpython-lru_cache-weakref: Python/dtoa.c annotate

annotate Python/dtoa.c @ 80661:94de77bd0b4b 2.7

Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.

author	Andrew Svetlov <andrew.svetlov@gmail.com>
date	Thu, 29 Nov 2012 19:51:28 +0200
parents	5cea27275af1
children	6d6a018a3bb0

rev	line source
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1 /****************************************************************
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	3 * The author of this software is David M. Gay.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	4 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	5 * Copyright (c) 1991, 2000, 2001 by Lucent Technologies.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	6 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	7 * Permission to use, copy, modify, and distribute this software for any
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	8 * purpose without fee is hereby granted, provided that this entire notice
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	9 * is included in all copies of any software which is or includes a copy
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	10 * or modification of this software and in all copies of the supporting
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	11 * documentation for such software.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	12 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	13 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	14 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	15 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	16 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	17 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	18 ***************************************************************/
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	19
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	20 /****************************************************************
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	21 * This is dtoa.c by David M. Gay, downloaded from
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	22 * http://www.netlib.org/fp/dtoa.c on April 15, 2009 and modified for
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	23 * inclusion into the Python core by Mark E. T. Dickinson and Eric V. Smith.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	24 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	25 * Please remember to check http://www.netlib.org/fp regularly (and especially
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	26 * before any Python release) for bugfixes and updates.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	27 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	28 * The major modifications from Gay's original code are as follows:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	29 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	30 * 0. The original code has been specialized to Python's needs by removing
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	31 * many of the #ifdef'd sections. In particular, code to support VAX and
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	32 * IBM floating-point formats, hex NaNs, hex floats, locale-aware
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	33 * treatment of the decimal point, and setting of the inexact flag have
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	34 * been removed.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	35 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	36 * 1. We use PyMem_Malloc and PyMem_Free in place of malloc and free.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	37 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	38 * 2. The public functions strtod, dtoa and freedtoa all now have
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	39 * a _Py_dg_ prefix.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	40 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	41 * 3. Instead of assuming that PyMem_Malloc always succeeds, we thread
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	42 * PyMem_Malloc failures through the code. The functions
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	43 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	44 * Balloc, multadd, s2b, i2b, mult, pow5mult, lshift, diff, d2b
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	45 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	46 * of return type *Bigint all return NULL to indicate a malloc failure.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	47 * Similarly, rv_alloc and nrv_alloc (return type char *) return NULL on
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	48 * failure. bigcomp now has return type int (it used to be void) and
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	49 * returns -1 on failure and 0 otherwise. _Py_dg_dtoa returns NULL
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	50 * on failure. _Py_dg_strtod indicates failure due to malloc failure
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	51 * by returning -1.0, setting errno=ENOMEM and *se to s00.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	52 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	53 * 4. The static variable dtoa_result has been removed. Callers of
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	54 * _Py_dg_dtoa are expected to call _Py_dg_freedtoa to free
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	55 * the memory allocated by _Py_dg_dtoa.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	56 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	57 * 5. The code has been reformatted to better fit with Python's
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	58 * C style guide (PEP 7).
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	59 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	60 * 6. A bug in the memory allocation has been fixed: to avoid FREEing memory
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	61 * that hasn't been MALLOC'ed, private_mem should only be used when k <=
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	62 * Kmax.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	63 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	64 * 7. _Py_dg_strtod has been modified so that it doesn't accept strings with
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	65 * leading whitespace.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	66 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	67 ***************************************************************/
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	68
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	69 /* Please send bug reports for the original dtoa.c code to David M. Gay (dmg
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	70 * at acm dot org, with " at " changed at "@" and " dot " changed to ".").
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	71 * Please report bugs for this modified version using the Python issue tracker
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	72 * (http://bugs.python.org). */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	73
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	74 /* On a machine with IEEE extended-precision registers, it is
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	75 * necessary to specify double-precision (53-bit) rounding precision
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	76 * before invoking strtod or dtoa. If the machine uses (the equivalent
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	77 * of) Intel 80x87 arithmetic, the call
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	78 * _control87(PC_53, MCW_PC);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	79 * does this with many compilers. Whether this or another call is
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	80 * appropriate depends on the compiler; for this to work, it may be
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	81 * necessary to #include "float.h" or another system-dependent header
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	82 * file.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	83 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	84
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	85 /* strtod for IEEE-, VAX-, and IBM-arithmetic machines.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	86 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	87 * This strtod returns a nearest machine number to the input decimal
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	88 * string (or sets errno to ERANGE). With IEEE arithmetic, ties are
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	89 * broken by the IEEE round-even rule. Otherwise ties are broken by
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	90 * biased rounding (add half and chop).
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	91 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	92 * Inspired loosely by William D. Clinger's paper "How to Read Floating
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	93 * Point Numbers Accurately" [Proc. ACM SIGPLAN '90, pp. 92-101].
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	94 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	95 * Modifications:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	96 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	97 * 1. We only require IEEE, IBM, or VAX double-precision
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	98 * arithmetic (not IEEE double-extended).
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	99 * 2. We get by with floating-point arithmetic in a case that
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	100 * Clinger missed -- when we're computing d * 10^n
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	101 * for a small integer d and the integer n is not too
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	102 * much larger than 22 (the maximum integer k for which
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	103 * we can represent 10^k exactly), we may be able to
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	104 * compute (d10^k) 10^(e-k) with just one roundoff.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	105 * 3. Rather than a bit-at-a-time adjustment of the binary
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	106 * result in the hard case, we use floating-point
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	107 * arithmetic to determine the adjustment to within
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	108 * one bit; only in really hard cases do we need to
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	109 * compute a second residual.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	110 * 4. Because of 3., we don't need a large table of powers of 10
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	111 * for ten-to-e (just some small tables, e.g. of 10^k
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	112 * for 0 <= k <= 22).
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	113 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	114
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	115 /* Linking of Python's #defines to Gay's #defines starts here. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	116
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	117 #include "Python.h"
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	118
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	119 /* if PY_NO_SHORT_FLOAT_REPR is defined, then don't even try to compile
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	120 the following code */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	121 #ifndef PY_NO_SHORT_FLOAT_REPR
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	122
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	123 #include "float.h"
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	124
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	125 #define MALLOC PyMem_Malloc
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	126 #define FREE PyMem_Free
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	127
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	128 /* This code should also work for ARM mixed-endian format on little-endian
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	129 machines, where doubles have byte order 45670123 (in increasing address
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	130 order, 0 being the least significant byte). */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	131 #ifdef DOUBLE_IS_LITTLE_ENDIAN_IEEE754
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	132 # define IEEE_8087
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	133 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	134 #if defined(DOUBLE_IS_BIG_ENDIAN_IEEE754) \|\| \
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	135 defined(DOUBLE_IS_ARM_MIXED_ENDIAN_IEEE754)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	136 # define IEEE_MC68k
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	137 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	138 #if defined(IEEE_8087) + defined(IEEE_MC68k) != 1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	139 #error "Exactly one of IEEE_8087 or IEEE_MC68k should be defined."
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	140 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	141
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	142 /* The code below assumes that the endianness of integers matches the
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	143 endianness of the two 32-bit words of a double. Check this. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	144 #if defined(WORDS_BIGENDIAN) && (defined(DOUBLE_IS_LITTLE_ENDIAN_IEEE754) \|\| \
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	145 defined(DOUBLE_IS_ARM_MIXED_ENDIAN_IEEE754))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	146 #error "doubles and ints have incompatible endianness"
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	147 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	148
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	149 #if !defined(WORDS_BIGENDIAN) && defined(DOUBLE_IS_BIG_ENDIAN_IEEE754)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	150 #error "doubles and ints have incompatible endianness"
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	151 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	152
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	153
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	154 #if defined(HAVE_UINT32_T) && defined(HAVE_INT32_T)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	155 typedef PY_UINT32_T ULong;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	156 typedef PY_INT32_T Long;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	157 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	158 #error "Failed to find an exact-width 32-bit integer type"
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	159 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	160
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	161 #if defined(HAVE_UINT64_T)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	162 #define ULLong PY_UINT64_T
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	163 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	164 #undef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	165 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	166
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	167 #undef DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	168 #ifdef Py_DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	169 #define DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	170 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	171
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	172 /* End Python #define linking */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	173
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	174 #ifdef DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	175 #define Bug(x) {fprintf(stderr, "%s\n", x); exit(1);}
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	176 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	177
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	178 #ifndef PRIVATE_MEM
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	179 #define PRIVATE_MEM 2304
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	180 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	181 #define PRIVATE_mem ((PRIVATE_MEM+sizeof(double)-1)/sizeof(double))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	182 static double private_mem[PRIVATE_mem], *pmem_next = private_mem;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	183
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	184 #ifdef __cplusplus
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	185 extern "C" {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	186 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	187
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	188 typedef union { double d; ULong L[2]; } U;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	189
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	190 #ifdef IEEE_8087
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	191 #define word0(x) (x)->L[1]
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	192 #define word1(x) (x)->L[0]
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	193 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	194 #define word0(x) (x)->L[0]
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	195 #define word1(x) (x)->L[1]
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	196 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	197 #define dval(x) (x)->d
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	198
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	199 #ifndef STRTOD_DIGLIM
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	200 #define STRTOD_DIGLIM 40
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	201 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	202
58249 33e402909cf2 Change a variable type to avoid signed overflow; replace repeated '19999' constant by a define. Mark Dickinson <dickinsm@gmail.com> parents: 58239 diff changeset	203 /* maximum permitted exponent value for strtod; exponents larger than
33e402909cf2 Change a variable type to avoid signed overflow; replace repeated '19999' constant by a define. Mark Dickinson <dickinsm@gmail.com> parents: 58239 diff changeset	204 MAX_ABS_EXP in absolute value get truncated to +-MAX_ABS_EXP. MAX_ABS_EXP
33e402909cf2 Change a variable type to avoid signed overflow; replace repeated '19999' constant by a define. Mark Dickinson <dickinsm@gmail.com> parents: 58239 diff changeset	205 should fit into an int. */
33e402909cf2 Change a variable type to avoid signed overflow; replace repeated '19999' constant by a define. Mark Dickinson <dickinsm@gmail.com> parents: 58239 diff changeset	206 #ifndef MAX_ABS_EXP
33e402909cf2 Change a variable type to avoid signed overflow; replace repeated '19999' constant by a define. Mark Dickinson <dickinsm@gmail.com> parents: 58239 diff changeset	207 #define MAX_ABS_EXP 19999U
33e402909cf2 Change a variable type to avoid signed overflow; replace repeated '19999' constant by a define. Mark Dickinson <dickinsm@gmail.com> parents: 58239 diff changeset	208 #endif
33e402909cf2 Change a variable type to avoid signed overflow; replace repeated '19999' constant by a define. Mark Dickinson <dickinsm@gmail.com> parents: 58239 diff changeset	209
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	210 /* The following definition of Storeinc is appropriate for MIPS processors.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	211 * An alternative that might be better on some machines is
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	212 * #define Storeinc(a,b,c) (*a++ = b << 16 \| c & 0xffff)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	213 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	214 #if defined(IEEE_8087)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	215 #define Storeinc(a,b,c) (((unsigned short *)a)[1] = (unsigned short)b, \
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	216 ((unsigned short *)a)[0] = (unsigned short)c, a++)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	217 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	218 #define Storeinc(a,b,c) (((unsigned short *)a)[0] = (unsigned short)b, \
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	219 ((unsigned short *)a)[1] = (unsigned short)c, a++)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	220 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	221
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	222 /* #define P DBL_MANT_DIG */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	223 /* Ten_pmax = floor(Plog(2)/log(5)) /
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	224 /* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	225 /* Quick_max = floor((P-1)log(FLT_RADIX)/log(10) - 1) /
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	226 /* Int_max = floor(Plog(FLT_RADIX)/log(10) - 1) /
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	227
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	228 #define Exp_shift 20
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	229 #define Exp_shift1 20
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	230 #define Exp_msk1 0x100000
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	231 #define Exp_msk11 0x100000
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	232 #define Exp_mask 0x7ff00000
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	233 #define P 53
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	234 #define Nbits 53
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	235 #define Bias 1023
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	236 #define Emax 1023
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	237 #define Emin (-1022)
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	238 #define Etiny (-1074) /* smallest denormal is 2*Etiny /
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	239 #define Exp_1 0x3ff00000
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	240 #define Exp_11 0x3ff00000
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	241 #define Ebits 11
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	242 #define Frac_mask 0xfffff
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	243 #define Frac_mask1 0xfffff
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	244 #define Ten_pmax 22
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	245 #define Bletch 0x10
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	246 #define Bndry_mask 0xfffff
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	247 #define Bndry_mask1 0xfffff
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	248 #define Sign_bit 0x80000000
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	249 #define Log2P 1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	250 #define Tiny0 0
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	251 #define Tiny1 1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	252 #define Quick_max 14
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	253 #define Int_max 14
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	254
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	255 #ifndef Flt_Rounds
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	256 #ifdef FLT_ROUNDS
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	257 #define Flt_Rounds FLT_ROUNDS
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	258 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	259 #define Flt_Rounds 1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	260 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	261 #endif /Flt_Rounds/
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	262
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	263 #define Rounding Flt_Rounds
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	264
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	265 #define Big0 (Frac_mask1 \| Exp_msk1*(DBL_MAX_EXP+Bias-1))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	266 #define Big1 0xffffffff
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	267
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	268 /* struct BCinfo is used to pass information from _Py_dg_strtod to bigcomp */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	269
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	270 typedef struct BCinfo BCinfo;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	271 struct
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	272 BCinfo {
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	273 int e0, nd, nd0, scale;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	274 };
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	275
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	276 #define FFFFFFFF 0xffffffffUL
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	277
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	278 #define Kmax 7
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	279
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	280 /* struct Bigint is used to represent arbitrary-precision integers. These
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	281 integers are stored in sign-magnitude format, with the magnitude stored as
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	282 an array of base 2**32 digits. Bigints are always normalized: if x is a
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	283 Bigint then x->wds >= 1, and either x->wds == 1 or x[wds-1] is nonzero.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	284
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	285 The Bigint fields are as follows:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	286
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	287 - next is a header used by Balloc and Bfree to keep track of lists
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	288 of freed Bigints; it's also used for the linked list of
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	289 powers of 5 of the form 52i used by pow5mult.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	290 - k indicates which pool this Bigint was allocated from
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	291 - maxwds is the maximum number of words space was allocated for
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	292 (usually maxwds == 2**k)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	293 - sign is 1 for negative Bigints, 0 for positive. The sign is unused
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	294 (ignored on inputs, set to 0 on outputs) in almost all operations
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	295 involving Bigints: a notable exception is the diff function, which
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	296 ignores signs on inputs but sets the sign of the output correctly.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	297 - wds is the actual number of significant words
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	298 - x contains the vector of words (digits) for this Bigint, from least
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	299 significant (x[0]) to most significant (x[wds-1]).
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	300 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	301
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	302 struct
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	303 Bigint {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	304 struct Bigint *next;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	305 int k, maxwds, sign, wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	306 ULong x[1];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	307 };
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	308
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	309 typedef struct Bigint Bigint;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	310
58401 5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	311 #ifndef Py_USING_MEMORY_DEBUGGER
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	312
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	313 /* Memory management: memory is allocated from, and returned to, Kmax+1 pools
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	314 of memory, where pool k (0 <= k <= Kmax) is for Bigints b with b->maxwds ==
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	315 1 << k. These pools are maintained as linked lists, with freelist[k]
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	316 pointing to the head of the list for pool k.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	317
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	318 On allocation, if there's no free slot in the appropriate pool, MALLOC is
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	319 called to get more memory. This memory is not returned to the system until
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	320 Python quits. There's also a private memory pool that's allocated from
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	321 in preference to using MALLOC.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	322
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	323 For Bigints with more than (1 << Kmax) digits (which implies at least 1233
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	324 decimal digits), memory is directly allocated using MALLOC, and freed using
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	325 FREE.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	326
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	327 XXX: it would be easy to bypass this memory-management system and
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	328 translate each call to Balloc into a call to PyMem_Malloc, and each
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	329 Bfree to PyMem_Free. Investigate whether this has any significant
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	330 performance on impact. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	331
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	332 static Bigint *freelist[Kmax+1];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	333
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	334 /* Allocate space for a Bigint with up to 1<<k digits */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	335
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	336 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	337 Balloc(int k)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	338 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	339 int x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	340 Bigint *rv;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	341 unsigned int len;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	342
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	343 if (k <= Kmax && (rv = freelist[k]))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	344 freelist[k] = rv->next;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	345 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	346 x = 1 << k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	347 len = (sizeof(Bigint) + (x-1)*sizeof(ULong) + sizeof(double) - 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	348 /sizeof(double);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	349 if (k <= Kmax && pmem_next - private_mem + len <= PRIVATE_mem) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	350 rv = (Bigint*)pmem_next;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	351 pmem_next += len;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	352 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	353 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	354 rv = (Bigint)MALLOC(lensizeof(double));
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	355 if (rv == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	356 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	357 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	358 rv->k = k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	359 rv->maxwds = x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	360 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	361 rv->sign = rv->wds = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	362 return rv;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	363 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	364
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	365 /* Free a Bigint allocated with Balloc */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	366
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	367 static void
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	368 Bfree(Bigint *v)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	369 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	370 if (v) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	371 if (v->k > Kmax)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	372 FREE((void*)v);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	373 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	374 v->next = freelist[v->k];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	375 freelist[v->k] = v;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	376 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	377 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	378 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	379
58401 5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	380 #else
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	381
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	382 /* Alternative versions of Balloc and Bfree that use PyMem_Malloc and
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	383 PyMem_Free directly in place of the custom memory allocation scheme above.
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	384 These are provided for the benefit of memory debugging tools like
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	385 Valgrind. */
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	386
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	387 /* Allocate space for a Bigint with up to 1<<k digits */
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	388
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	389 static Bigint *
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	390 Balloc(int k)
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	391 {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	392 int x;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	393 Bigint *rv;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	394 unsigned int len;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	395
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	396 x = 1 << k;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	397 len = (sizeof(Bigint) + (x-1)*sizeof(ULong) + sizeof(double) - 1)
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	398 /sizeof(double);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	399
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	400 rv = (Bigint)MALLOC(lensizeof(double));
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	401 if (rv == NULL)
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	402 return NULL;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	403
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	404 rv->k = k;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	405 rv->maxwds = x;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	406 rv->sign = rv->wds = 0;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	407 return rv;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	408 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	409
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	410 /* Free a Bigint allocated with Balloc */
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	411
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	412 static void
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	413 Bfree(Bigint *v)
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	414 {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	415 if (v) {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	416 FREE((void*)v);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	417 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	418 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	419
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	420 #endif /* Py_USING_MEMORY_DEBUGGER */
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	421
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	422 #define Bcopy(x,y) memcpy((char )&x->sign, (char )&y->sign, \
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	423 y->wdssizeof(Long) + 2sizeof(int))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	424
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	425 /* Multiply a Bigint b by m and add a. Either modifies b in place and returns
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	426 a pointer to the modified b, or Bfrees b and returns a pointer to a copy.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	427 On failure, return NULL. In this case, b will have been already freed. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	428
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	429 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	430 multadd(Bigint b, int m, int a) / multiply by m and add a */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	431 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	432 int i, wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	433 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	434 ULong *x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	435 ULLong carry, y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	436 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	437 ULong carry, *x, y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	438 ULong xi, z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	439 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	440 Bigint *b1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	441
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	442 wds = b->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	443 x = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	444 i = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	445 carry = a;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	446 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	447 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	448 y = x (ULLong)m + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	449 carry = y >> 32;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	450 *x++ = (ULong)(y & FFFFFFFF);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	451 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	452 xi = *x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	453 y = (xi & 0xffff) * m + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	454 z = (xi >> 16) * m + (y >> 16);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	455 carry = z >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	456 *x++ = (z << 16) + (y & 0xffff);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	457 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	458 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	459 while(++i < wds);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	460 if (carry) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	461 if (wds >= b->maxwds) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	462 b1 = Balloc(b->k+1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	463 if (b1 == NULL){
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	464 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	465 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	466 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	467 Bcopy(b1, b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	468 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	469 b = b1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	470 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	471 b->x[wds++] = (ULong)carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	472 b->wds = wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	473 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	474 return b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	475 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	476
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	477 /* convert a string s containing nd decimal digits (possibly containing a
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	478 decimal separator at position nd0, which is ignored) to a Bigint. This
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	479 function carries on where the parsing code in _Py_dg_strtod leaves off: on
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	480 entry, y9 contains the result of converting the first 9 digits. Returns
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	481 NULL on failure. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	482
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	483 static Bigint *
58310 b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	484 s2b(const char *s, int nd0, int nd, ULong y9)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	485 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	486 Bigint *b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	487 int i, k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	488 Long x, y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	489
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	490 x = (nd + 8) / 9;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	491 for(k = 0, y = 1; x > y; y <<= 1, k++) ;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	492 b = Balloc(k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	493 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	494 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	495 b->x[0] = y9;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	496 b->wds = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	497
58310 b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	498 if (nd <= 9)
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	499 return b;
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	500
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	501 s += 9;
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	502 for (i = 9; i < nd0; i++) {
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	503 b = multadd(b, 10, *s++ - '0');
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	504 if (b == NULL)
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	505 return NULL;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	506 }
58310 b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	507 s++;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	508 for(; i < nd; i++) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	509 b = multadd(b, 10, *s++ - '0');
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	510 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	511 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	512 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	513 return b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	514 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	515
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	516 /* count leading 0 bits in the 32-bit integer x. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	517
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	518 static int
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	519 hi0bits(ULong x)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	520 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	521 int k = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	522
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	523 if (!(x & 0xffff0000)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	524 k = 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	525 x <<= 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	526 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	527 if (!(x & 0xff000000)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	528 k += 8;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	529 x <<= 8;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	530 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	531 if (!(x & 0xf0000000)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	532 k += 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	533 x <<= 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	534 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	535 if (!(x & 0xc0000000)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	536 k += 2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	537 x <<= 2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	538 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	539 if (!(x & 0x80000000)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	540 k++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	541 if (!(x & 0x40000000))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	542 return 32;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	543 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	544 return k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	545 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	546
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	547 /* count trailing 0 bits in the 32-bit integer y, and shift y right by that
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	548 number of bits. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	549
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	550 static int
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	551 lo0bits(ULong *y)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	552 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	553 int k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	554 ULong x = *y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	555
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	556 if (x & 7) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	557 if (x & 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	558 return 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	559 if (x & 2) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	560 *y = x >> 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	561 return 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	562 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	563 *y = x >> 2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	564 return 2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	565 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	566 k = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	567 if (!(x & 0xffff)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	568 k = 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	569 x >>= 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	570 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	571 if (!(x & 0xff)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	572 k += 8;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	573 x >>= 8;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	574 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	575 if (!(x & 0xf)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	576 k += 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	577 x >>= 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	578 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	579 if (!(x & 0x3)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	580 k += 2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	581 x >>= 2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	582 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	583 if (!(x & 1)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	584 k++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	585 x >>= 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	586 if (!x)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	587 return 32;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	588 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	589 *y = x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	590 return k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	591 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	592
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	593 /* convert a small nonnegative integer to a Bigint */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	594
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	595 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	596 i2b(int i)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	597 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	598 Bigint *b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	599
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	600 b = Balloc(1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	601 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	602 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	603 b->x[0] = i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	604 b->wds = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	605 return b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	606 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	607
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	608 /* multiply two Bigints. Returns a new Bigint, or NULL on failure. Ignores
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	609 the signs of a and b. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	610
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	611 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	612 mult(Bigint a, Bigint b)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	613 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	614 Bigint *c;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	615 int k, wa, wb, wc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	616 ULong x, xa, xae, xb, xbe, xc, *xc0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	617 ULong y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	618 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	619 ULLong carry, z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	620 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	621 ULong carry, z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	622 ULong z2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	623 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	624
58458 d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	625 if ((!a->x[0] && a->wds == 1) \|\| (!b->x[0] && b->wds == 1)) {
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	626 c = Balloc(0);
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	627 if (c == NULL)
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	628 return NULL;
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	629 c->wds = 1;
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	630 c->x[0] = 0;
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	631 return c;
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	632 }
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	633
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	634 if (a->wds < b->wds) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	635 c = a;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	636 a = b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	637 b = c;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	638 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	639 k = a->k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	640 wa = a->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	641 wb = b->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	642 wc = wa + wb;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	643 if (wc > a->maxwds)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	644 k++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	645 c = Balloc(k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	646 if (c == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	647 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	648 for(x = c->x, xa = x + wc; x < xa; x++)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	649 *x = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	650 xa = a->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	651 xae = xa + wa;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	652 xb = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	653 xbe = xb + wb;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	654 xc0 = c->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	655 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	656 for(; xb < xbe; xc0++) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	657 if ((y = *xb++)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	658 x = xa;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	659 xc = xc0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	660 carry = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	661 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	662 z = x++ (ULLong)y + *xc + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	663 carry = z >> 32;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	664 *xc++ = (ULong)(z & FFFFFFFF);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	665 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	666 while(x < xae);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	667 *xc = (ULong)carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	668 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	669 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	670 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	671 for(; xb < xbe; xb++, xc0++) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	672 if (y = *xb & 0xffff) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	673 x = xa;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	674 xc = xc0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	675 carry = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	676 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	677 z = (x & 0xffff) y + (*xc & 0xffff) + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	678 carry = z >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	679 z2 = (x++ >> 16) y + (*xc >> 16) + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	680 carry = z2 >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	681 Storeinc(xc, z2, z);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	682 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	683 while(x < xae);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	684 *xc = carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	685 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	686 if (y = *xb >> 16) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	687 x = xa;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	688 xc = xc0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	689 carry = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	690 z2 = *xc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	691 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	692 z = (x & 0xffff) y + (*xc >> 16) + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	693 carry = z >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	694 Storeinc(xc, z, z2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	695 z2 = (x++ >> 16) y + (*xc & 0xffff) + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	696 carry = z2 >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	697 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	698 while(x < xae);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	699 *xc = z2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	700 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	701 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	702 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	703 for(xc0 = c->x, xc = xc0 + wc; wc > 0 && !*--xc; --wc) ;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	704 c->wds = wc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	705 return c;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	706 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	707
58401 5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	708 #ifndef Py_USING_MEMORY_DEBUGGER
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	709
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	710 /* p5s is a linked list of powers of 5 of the form 5(2i), i >= 2 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	711
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	712 static Bigint *p5s;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	713
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	714 /* multiply the Bigint b by 5**k. Returns a pointer to the result, or NULL on
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	715 failure; if the returned pointer is distinct from b then the original
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	716 Bigint b will have been Bfree'd. Ignores the sign of b. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	717
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	718 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	719 pow5mult(Bigint *b, int k)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	720 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	721 Bigint b1, p5, *p51;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	722 int i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	723 static int p05[3] = { 5, 25, 125 };
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	724
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	725 if ((i = k & 3)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	726 b = multadd(b, p05[i-1], 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	727 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	728 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	729 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	730
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	731 if (!(k >>= 2))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	732 return b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	733 p5 = p5s;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	734 if (!p5) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	735 /* first time */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	736 p5 = i2b(625);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	737 if (p5 == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	738 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	739 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	740 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	741 p5s = p5;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	742 p5->next = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	743 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	744 for(;;) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	745 if (k & 1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	746 b1 = mult(b, p5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	747 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	748 b = b1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	749 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	750 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	751 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	752 if (!(k >>= 1))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	753 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	754 p51 = p5->next;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	755 if (!p51) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	756 p51 = mult(p5,p5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	757 if (p51 == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	758 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	759 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	760 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	761 p51->next = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	762 p5->next = p51;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	763 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	764 p5 = p51;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	765 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	766 return b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	767 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	768
58401 5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	769 #else
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	770
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	771 /* Version of pow5mult that doesn't cache powers of 5. Provided for
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	772 the benefit of memory debugging tools like Valgrind. */
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	773
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	774 static Bigint *
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	775 pow5mult(Bigint *b, int k)
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	776 {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	777 Bigint b1, p5, *p51;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	778 int i;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	779 static int p05[3] = { 5, 25, 125 };
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	780
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	781 if ((i = k & 3)) {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	782 b = multadd(b, p05[i-1], 0);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	783 if (b == NULL)
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	784 return NULL;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	785 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	786
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	787 if (!(k >>= 2))
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	788 return b;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	789 p5 = i2b(625);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	790 if (p5 == NULL) {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	791 Bfree(b);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	792 return NULL;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	793 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	794
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	795 for(;;) {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	796 if (k & 1) {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	797 b1 = mult(b, p5);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	798 Bfree(b);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	799 b = b1;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	800 if (b == NULL) {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	801 Bfree(p5);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	802 return NULL;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	803 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	804 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	805 if (!(k >>= 1))
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	806 break;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	807 p51 = mult(p5, p5);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	808 Bfree(p5);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	809 p5 = p51;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	810 if (p5 == NULL) {
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	811 Bfree(b);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	812 return NULL;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	813 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	814 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	815 Bfree(p5);
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	816 return b;
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	817 }
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	818
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	819 #endif /* Py_USING_MEMORY_DEBUGGER */
5c9c53a721a5 Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the Mark Dickinson <dickinsm@gmail.com> parents: 58390 diff changeset	820
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	821 /* shift a Bigint b left by k bits. Return a pointer to the shifted result,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	822 or NULL on failure. If the returned pointer is distinct from b then the
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	823 original b will have been Bfree'd. Ignores the sign of b. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	824
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	825 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	826 lshift(Bigint *b, int k)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	827 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	828 int i, k1, n, n1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	829 Bigint *b1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	830 ULong x, x1, *xe, z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	831
58458 d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	832 if (!k \|\| (!b->x[0] && b->wds == 1))
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	833 return b;
d77c947ff7db Issue #7743: Add checks for zero inputs to the lshift and mult functions; Mark Dickinson <dickinsm@gmail.com> parents: 58444 diff changeset	834
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	835 n = k >> 5;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	836 k1 = b->k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	837 n1 = n + b->wds + 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	838 for(i = b->maxwds; n1 > i; i <<= 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	839 k1++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	840 b1 = Balloc(k1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	841 if (b1 == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	842 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	843 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	844 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	845 x1 = b1->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	846 for(i = 0; i < n; i++)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	847 *x1++ = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	848 x = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	849 xe = x + b->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	850 if (k &= 0x1f) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	851 k1 = 32 - k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	852 z = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	853 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	854 x1++ = x << k \| z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	855 z = *x++ >> k1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	856 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	857 while(x < xe);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	858 if ((*x1 = z))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	859 ++n1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	860 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	861 else do
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	862 x1++ = x++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	863 while(x < xe);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	864 b1->wds = n1 - 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	865 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	866 return b1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	867 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	868
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	869 /* Do a three-way compare of a and b, returning -1 if a < b, 0 if a == b and
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	870 1 if a > b. Ignores signs of a and b. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	871
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	872 static int
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	873 cmp(Bigint a, Bigint b)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	874 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	875 ULong xa, xa0, xb, xb0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	876 int i, j;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	877
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	878 i = a->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	879 j = b->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	880 #ifdef DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	881 if (i > 1 && !a->x[i-1])
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	882 Bug("cmp called with a->x[a->wds-1] == 0");
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	883 if (j > 1 && !b->x[j-1])
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	884 Bug("cmp called with b->x[b->wds-1] == 0");
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	885 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	886 if (i -= j)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	887 return i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	888 xa0 = a->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	889 xa = xa0 + j;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	890 xb0 = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	891 xb = xb0 + j;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	892 for(;;) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	893 if (--xa != --xb)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	894 return xa < xb ? -1 : 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	895 if (xa <= xa0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	896 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	897 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	898 return 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	899 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	900
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	901 /* Take the difference of Bigints a and b, returning a new Bigint. Returns
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	902 NULL on failure. The signs of a and b are ignored, but the sign of the
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	903 result is set appropriately. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	904
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	905 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	906 diff(Bigint a, Bigint b)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	907 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	908 Bigint *c;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	909 int i, wa, wb;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	910 ULong xa, xae, xb, xbe, *xc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	911 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	912 ULLong borrow, y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	913 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	914 ULong borrow, y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	915 ULong z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	916 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	917
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	918 i = cmp(a,b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	919 if (!i) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	920 c = Balloc(0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	921 if (c == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	922 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	923 c->wds = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	924 c->x[0] = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	925 return c;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	926 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	927 if (i < 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	928 c = a;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	929 a = b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	930 b = c;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	931 i = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	932 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	933 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	934 i = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	935 c = Balloc(a->k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	936 if (c == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	937 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	938 c->sign = i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	939 wa = a->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	940 xa = a->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	941 xae = xa + wa;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	942 wb = b->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	943 xb = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	944 xbe = xb + wb;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	945 xc = c->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	946 borrow = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	947 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	948 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	949 y = (ULLong)xa++ - xb++ - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	950 borrow = y >> 32 & (ULong)1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	951 *xc++ = (ULong)(y & FFFFFFFF);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	952 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	953 while(xb < xbe);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	954 while(xa < xae) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	955 y = *xa++ - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	956 borrow = y >> 32 & (ULong)1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	957 *xc++ = (ULong)(y & FFFFFFFF);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	958 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	959 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	960 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	961 y = (xa & 0xffff) - (xb & 0xffff) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	962 borrow = (y & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	963 z = (xa++ >> 16) - (xb++ >> 16) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	964 borrow = (z & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	965 Storeinc(xc, z, y);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	966 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	967 while(xb < xbe);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	968 while(xa < xae) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	969 y = (*xa & 0xffff) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	970 borrow = (y & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	971 z = (*xa++ >> 16) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	972 borrow = (z & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	973 Storeinc(xc, z, y);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	974 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	975 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	976 while(!*--xc)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	977 wa--;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	978 c->wds = wa;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	979 return c;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	980 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	981
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	982 /* Given a positive normal double x, return the difference between x and the
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	983 next double up. Doesn't give correct results for subnormals. */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	984
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	985 static double
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	986 ulp(U *x)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	987 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	988 Long L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	989 U u;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	990
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	991 L = (word0(x) & Exp_mask) - (P-1)*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	992 word0(&u) = L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	993 word1(&u) = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	994 return dval(&u);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	995 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	996
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	997 /* Convert a Bigint to a double plus an exponent */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	998
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	999 static double
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1000 b2d(Bigint a, int e)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1001 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1002 ULong xa, xa0, w, y, z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1003 int k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1004 U d;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1005
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1006 xa0 = a->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1007 xa = xa0 + a->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1008 y = *--xa;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1009 #ifdef DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1010 if (!y) Bug("zero y in b2d");
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1011 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1012 k = hi0bits(y);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1013 *e = 32 - k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1014 if (k < Ebits) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1015 word0(&d) = Exp_1 \| y >> (Ebits - k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1016 w = xa > xa0 ? *--xa : 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1017 word1(&d) = y << ((32-Ebits) + k) \| w >> (Ebits - k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1018 goto ret_d;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1019 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1020 z = xa > xa0 ? *--xa : 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1021 if (k -= Ebits) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1022 word0(&d) = Exp_1 \| y << k \| z >> (32 - k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1023 y = xa > xa0 ? *--xa : 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1024 word1(&d) = z << k \| y >> (32 - k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1025 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1026 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1027 word0(&d) = Exp_1 \| y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1028 word1(&d) = z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1029 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1030 ret_d:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1031 return dval(&d);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1032 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1033
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1034 /* Convert a scaled double to a Bigint plus an exponent. Similar to d2b,
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1035 except that it accepts the scale parameter used in _Py_dg_strtod (which
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1036 should be either 0 or 2*P), and the normalization for the return value is
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1037 different (see below). On input, d should be finite and nonnegative, and d
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1038 / 2**scale should be exactly representable as an IEEE 754 double.
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1039
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1040 Returns a Bigint b and an integer e such that
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1041
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1042 dval(d) / 2*scale = b 2**e.
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1043
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1044 Unlike d2b, b is not necessarily odd: b and e are normalized so
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1045 that either 2(P-1) <= b < 2P and e >= Etiny, or b < 2**P
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1046 and e == Etiny. This applies equally to an input of 0.0: in that
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1047 case the return values are b = 0 and e = Etiny.
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1048
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1049 The above normalization ensures that for all possible inputs d,
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1050 2e gives ulp(d/2scale).
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1051
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1052 Returns NULL on failure.
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1053 */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1054
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1055 static Bigint *
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1056 sd2b(U d, int scale, int e)
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1057 {
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1058 Bigint *b;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1059
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1060 b = Balloc(1);
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1061 if (b == NULL)
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1062 return NULL;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1063
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1064 /* First construct b and e assuming that scale == 0. */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1065 b->wds = 2;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1066 b->x[0] = word1(d);
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1067 b->x[1] = word0(d) & Frac_mask;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1068 *e = Etiny - 1 + (int)((word0(d) & Exp_mask) >> Exp_shift);
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1069 if (*e < Etiny)
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1070 *e = Etiny;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1071 else
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1072 b->x[1] \|= Exp_msk1;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1073
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1074 /* Now adjust for scale, provided that b != 0. */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1075 if (scale && (b->x[0] \|\| b->x[1])) {
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1076 *e -= scale;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1077 if (*e < Etiny) {
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1078 scale = Etiny - *e;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1079 *e = Etiny;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1080 /* We can't shift more than P-1 bits without shifting out a 1. */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1081 assert(0 < scale && scale <= P - 1);
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1082 if (scale >= 32) {
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1083 /* The bits shifted out should all be zero. */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1084 assert(b->x[0] == 0);
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1085 b->x[0] = b->x[1];
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1086 b->x[1] = 0;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1087 scale -= 32;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1088 }
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1089 if (scale) {
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1090 /* The bits shifted out should all be zero. */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1091 assert(b->x[0] << (32 - scale) == 0);
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1092 b->x[0] = (b->x[0] >> scale) \| (b->x[1] << (32 - scale));
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1093 b->x[1] >>= scale;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1094 }
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1095 }
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1096 }
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1097 /* Ensure b is normalized. */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1098 if (!b->x[1])
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1099 b->wds = 1;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1100
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1101 return b;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1102 }
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1103
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1104 /* Convert a double to a Bigint plus an exponent. Return NULL on failure.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1105
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1106 Given a finite nonzero double d, return an odd Bigint b and exponent *e
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1107 such that fabs(d) = b * 2*e. On return, bbits gives the number of
58151 8ca377853321 Fix typo in comment. Mark Dickinson <dickinsm@gmail.com> parents: 56709 diff changeset	1108 significant bits of b; that is, 2*(bbits-1) <= b < 2*(bbits).
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1109
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1110 If d is zero, then b == 0, e == -1010, bbits = 0.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1111 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1112
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1113 static Bigint *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1114 d2b(U d, int e, int *bits)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1115 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1116 Bigint *b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1117 int de, k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1118 ULong *x, y, z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1119 int i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1120
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1121 b = Balloc(1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1122 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1123 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1124 x = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1125
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1126 z = word0(d) & Frac_mask;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1127 word0(d) &= 0x7fffffff; /* clear sign bit, which we ignore */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1128 if ((de = (int)(word0(d) >> Exp_shift)))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1129 z \|= Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1130 if ((y = word1(d))) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1131 if ((k = lo0bits(&y))) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1132 x[0] = y \| z << (32 - k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1133 z >>= k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1134 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1135 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1136 x[0] = y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1137 i =
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1138 b->wds = (x[1] = z) ? 2 : 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1139 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1140 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1141 k = lo0bits(&z);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1142 x[0] = z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1143 i =
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1144 b->wds = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1145 k += 32;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1146 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1147 if (de) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1148 *e = de - Bias - (P-1) + k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1149 *bits = P - k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1150 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1151 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1152 *e = de - Bias - (P-1) + 1 + k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1153 bits = 32i - hi0bits(x[i-1]);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1154 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1155 return b;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1156 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1157
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1158 /* Compute the ratio of two Bigints, as a double. The result may have an
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1159 error of up to 2.5 ulps. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1160
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1161 static double
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1162 ratio(Bigint a, Bigint b)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1163 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1164 U da, db;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1165 int k, ka, kb;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1166
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1167 dval(&da) = b2d(a, &ka);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1168 dval(&db) = b2d(b, &kb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1169 k = ka - kb + 32*(a->wds - b->wds);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1170 if (k > 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1171 word0(&da) += k*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1172 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1173 k = -k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1174 word0(&db) += k*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1175 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1176 return dval(&da) / dval(&db);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1177 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1178
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1179 static const double
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1180 tens[] = {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1181 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1182 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1183 1e20, 1e21, 1e22
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1184 };
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1185
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1186 static const double
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1187 bigtens[] = { 1e16, 1e32, 1e64, 1e128, 1e256 };
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1188 static const double tinytens[] = { 1e-16, 1e-32, 1e-64, 1e-128,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1189 9007199254740992.*9007199254740992.e-256
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1190 /* = 2^106 * 1e-256 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1191 };
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1192 /* The factor of 2^53 in tinytens[4] helps us avoid setting the underflow */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1193 /* flag unnecessarily. It leads to a song and dance at the end of strtod. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1194 #define Scale_Bit 0x10
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1195 #define n_bigtens 5
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1196
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1197 #define ULbits 32
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1198 #define kshift 5
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1199 #define kmask 31
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1200
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1201
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1202 static int
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1203 dshift(Bigint *b, int p2)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1204 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1205 int rv = hi0bits(b->x[b->wds-1]) - 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1206 if (p2 > 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1207 rv -= p2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1208 return rv & kmask;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1209 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1210
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1211 /* special case of Bigint division. The quotient is always in the range 0 <=
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1212 quotient < 10, and on entry the divisor S is normalized so that its top 4
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1213 bits (28--31) are zero and bit 27 is set. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1214
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1215 static int
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1216 quorem(Bigint b, Bigint S)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1217 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1218 int n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1219 ULong bx, bxe, q, sx, sxe;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1220 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1221 ULLong borrow, carry, y, ys;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1222 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1223 ULong borrow, carry, y, ys;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1224 ULong si, z, zs;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1225 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1226
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1227 n = S->wds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1228 #ifdef DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1229 /debug/ if (b->wds > n)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1230 /debug/ Bug("oversize b in quorem");
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1231 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1232 if (b->wds < n)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1233 return 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1234 sx = S->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1235 sxe = sx + --n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1236 bx = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1237 bxe = bx + n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1238 q = bxe / (sxe + 1); /* ensure q <= true quotient */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1239 #ifdef DEBUG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1240 /debug/ if (q > 9)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1241 /debug/ Bug("oversized quotient in quorem");
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1242 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1243 if (q) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1244 borrow = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1245 carry = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1246 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1247 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1248 ys = sx++ (ULLong)q + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1249 carry = ys >> 32;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1250 y = *bx - (ys & FFFFFFFF) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1251 borrow = y >> 32 & (ULong)1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1252 *bx++ = (ULong)(y & FFFFFFFF);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1253 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1254 si = *sx++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1255 ys = (si & 0xffff) * q + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1256 zs = (si >> 16) * q + (ys >> 16);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1257 carry = zs >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1258 y = (*bx & 0xffff) - (ys & 0xffff) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1259 borrow = (y & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1260 z = (*bx >> 16) - (zs & 0xffff) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1261 borrow = (z & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1262 Storeinc(bx, z, y);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1263 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1264 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1265 while(sx <= sxe);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1266 if (!*bxe) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1267 bx = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1268 while(--bxe > bx && !*bxe)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1269 --n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1270 b->wds = n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1271 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1272 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1273 if (cmp(b, S) >= 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1274 q++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1275 borrow = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1276 carry = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1277 bx = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1278 sx = S->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1279 do {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1280 #ifdef ULLong
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1281 ys = *sx++ + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1282 carry = ys >> 32;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1283 y = *bx - (ys & FFFFFFFF) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1284 borrow = y >> 32 & (ULong)1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1285 *bx++ = (ULong)(y & FFFFFFFF);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1286 #else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1287 si = *sx++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1288 ys = (si & 0xffff) + carry;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1289 zs = (si >> 16) + (ys >> 16);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1290 carry = zs >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1291 y = (*bx & 0xffff) - (ys & 0xffff) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1292 borrow = (y & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1293 z = (*bx >> 16) - (zs & 0xffff) - borrow;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1294 borrow = (z & 0x10000) >> 16;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1295 Storeinc(bx, z, y);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1296 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1297 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1298 while(sx <= sxe);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1299 bx = b->x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1300 bxe = bx + n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1301 if (!*bxe) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1302 while(--bxe > bx && !*bxe)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1303 --n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1304 b->wds = n;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1305 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1306 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1307 return q;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1308 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1309
58305 c5a0a5d6acb0 Clarify that sulp expects a nonnegative input, but that +0.0 is fine. Mark Dickinson <dickinsm@gmail.com> parents: 58304 diff changeset	1310 /* sulp(x) is a version of ulp(x) that takes bc.scale into account.
58278 b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1311
58305 c5a0a5d6acb0 Clarify that sulp expects a nonnegative input, but that +0.0 is fine. Mark Dickinson <dickinsm@gmail.com> parents: 58304 diff changeset	1312 Assuming that x is finite and nonnegative (positive zero is fine
c5a0a5d6acb0 Clarify that sulp expects a nonnegative input, but that +0.0 is fine. Mark Dickinson <dickinsm@gmail.com> parents: 58304 diff changeset	1313 here) and x / 2^bc.scale is exactly representable as a double,
c5a0a5d6acb0 Clarify that sulp expects a nonnegative input, but that +0.0 is fine. Mark Dickinson <dickinsm@gmail.com> parents: 58304 diff changeset	1314 sulp(x) is equivalent to 2^bc.scale * ulp(x / 2^bc.scale). */
58278 b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1315
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1316 static double
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1317 sulp(U x, BCinfo bc)
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1318 {
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1319 U u;
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1320
58309 c7f33d5216f9 Fix buggy comparison: LHS of comparison was being treated as unsigned. Mark Dickinson <dickinsm@gmail.com> parents: 58308 diff changeset	1321 if (bc->scale && 2*P + 1 > (int)((word0(x) & Exp_mask) >> Exp_shift)) {
58278 b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1322 /* rv/2^bc->scale is subnormal */
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1323 word0(&u) = (P+2)*Exp_msk1;
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1324 word1(&u) = 0;
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1325 return u.d;
b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1326 }
58305 c5a0a5d6acb0 Clarify that sulp expects a nonnegative input, but that +0.0 is fine. Mark Dickinson <dickinsm@gmail.com> parents: 58304 diff changeset	1327 else {
c5a0a5d6acb0 Clarify that sulp expects a nonnegative input, but that +0.0 is fine. Mark Dickinson <dickinsm@gmail.com> parents: 58304 diff changeset	1328 assert(word0(x) \|\| word1(x)); /* x != 0.0 */
58278 b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1329 return ulp(x);
58305 c5a0a5d6acb0 Clarify that sulp expects a nonnegative input, but that +0.0 is fine. Mark Dickinson <dickinsm@gmail.com> parents: 58304 diff changeset	1330 }
58278 b4f301cea115 Issue #7632: Fix a bug in dtoa.c that could lead to incorrectly-rounded results. Mark Dickinson <dickinsm@gmail.com> parents: 58277 diff changeset	1331 }
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1332
58304 57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1333 /* The bigcomp function handles some hard cases for strtod, for inputs
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1334 with more than STRTOD_DIGLIM digits. It's called once an initial
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1335 estimate for the double corresponding to the input string has
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1336 already been obtained by the code in _Py_dg_strtod.
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1337
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1338 The bigcomp function is only called after _Py_dg_strtod has found a
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1339 double value rv such that either rv or rv + 1ulp represents the
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1340 correctly rounded value corresponding to the original string. It
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1341 determines which of these two values is the correct one by
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1342 computing the decimal digits of rv + 0.5ulp and comparing them with
58308 0f974bb238ed Simplify and annotate the bigcomp function, removing unused special cases. Mark Dickinson <dickinsm@gmail.com> parents: 58305 diff changeset	1343 the corresponding digits of s0.
58304 57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1344
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1345 In the following, write dv for the absolute value of the number represented
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1346 by the input string.
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1347
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1348 Inputs:
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1349
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1350 s0 points to the first significant digit of the input string.
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1351
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1352 rv is a (possibly scaled) estimate for the closest double value to the
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1353 value represented by the original input to _Py_dg_strtod. If
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1354 bc->scale is nonzero, then rv/2^(bc->scale) is the approximation to
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1355 the input value.
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1356
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1357 bc is a struct containing information gathered during the parsing and
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1358 estimation steps of _Py_dg_strtod. Description of fields follows:
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1359
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1360 bc->e0 gives the exponent of the input value, such that dv = (integer
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1361 given by the bd->nd digits of s0) * 10**e0
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1362
58310 b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	1363 bc->nd gives the total number of significant digits of s0. It will
b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	1364 be at least 1.
58304 57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1365
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1366 bc->nd0 gives the number of significant digits of s0 before the
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1367 decimal separator. If there's no decimal separator, bc->nd0 ==
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1368 bc->nd.
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1369
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1370 bc->scale is the value used to scale rv to avoid doing arithmetic with
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1371 subnormal values. It's either 0 or 2*P (=106).
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1372
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1373 Outputs:
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1374
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1375 On successful exit, rv/2^(bc->scale) is the closest double to dv.
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1376
57102283ab5e Add comments explaining the role of the bigcomp function in dtoa.c. Mark Dickinson <dickinsm@gmail.com> parents: 58278 diff changeset	1377 Returns 0 on success, -1 on failure (e.g., due to a failed malloc call). */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1378
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1379 static int
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1380 bigcomp(U rv, const char s0, BCinfo *bc)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1381 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1382 Bigint b, d;
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1383 int b2, d2, dd, i, nd, nd0, odd, p2, p5;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1384
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1385 nd = bc->nd;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1386 nd0 = bc->nd0;
58277 2a9f66df4dc4 Issue #7632: Fix a problem with _Py_dg_strtod that could lead to Mark Dickinson <dickinsm@gmail.com> parents: 58249 diff changeset	1387 p5 = nd + bc->e0;
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1388 b = sd2b(rv, bc->scale, &p2);
58308 0f974bb238ed Simplify and annotate the bigcomp function, removing unused special cases. Mark Dickinson <dickinsm@gmail.com> parents: 58305 diff changeset	1389 if (b == NULL)
0f974bb238ed Simplify and annotate the bigcomp function, removing unused special cases. Mark Dickinson <dickinsm@gmail.com> parents: 58305 diff changeset	1390 return -1;
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1391
58317 76fb7dbd7388 Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. Mark Dickinson <dickinsm@gmail.com> parents: 58316 diff changeset	1392 /* record whether the lsb of rv/2^(bc->scale) is odd: in the exact halfway
76fb7dbd7388 Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. Mark Dickinson <dickinsm@gmail.com> parents: 58316 diff changeset	1393 case, this is used for round to even. */
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1394 odd = b->x[0] & 1;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1395
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1396 /* left shift b by 1 bit and or a 1 into the least significant bit;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1397 this gives us b * 2*p2 = rv/2^(bc->scale) + 0.5 ulp. /
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1398 b = lshift(b, 1);
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1399 if (b == NULL)
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1400 return -1;
58308 0f974bb238ed Simplify and annotate the bigcomp function, removing unused special cases. Mark Dickinson <dickinsm@gmail.com> parents: 58305 diff changeset	1401 b->x[0] \|= 1;
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1402 p2--;
58308 0f974bb238ed Simplify and annotate the bigcomp function, removing unused special cases. Mark Dickinson <dickinsm@gmail.com> parents: 58305 diff changeset	1403
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1404 p2 -= p5;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1405 d = i2b(1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1406 if (d == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1407 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1408 return -1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1409 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1410 /* Arrange for convenient computation of quotients:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1411 * shift left if necessary so divisor has 4 leading 0 bits.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1412 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1413 if (p5 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1414 d = pow5mult(d, p5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1415 if (d == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1416 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1417 return -1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1418 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1419 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1420 else if (p5 < 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1421 b = pow5mult(b, -p5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1422 if (b == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1423 Bfree(d);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1424 return -1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1425 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1426 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1427 if (p2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1428 b2 = p2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1429 d2 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1430 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1431 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1432 b2 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1433 d2 = -p2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1434 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1435 i = dshift(d, d2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1436 if ((b2 += i) > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1437 b = lshift(b, b2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1438 if (b == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1439 Bfree(d);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1440 return -1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1441 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1442 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1443 if ((d2 += i) > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1444 d = lshift(d, d2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1445 if (d == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1446 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1447 return -1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1448 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1449 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1450
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1451 /* Compare s0 with b/d: set dd to -1, 0, or 1 according as s0 < b/d, s0 ==
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1452 * b/d, or s0 > b/d. Here the digits of s0 are thought of as representing
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1453 * a number in the range [0.1, 1). */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1454 if (cmp(b, d) >= 0)
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1455 /* b/d >= 1 */
58277 2a9f66df4dc4 Issue #7632: Fix a problem with _Py_dg_strtod that could lead to Mark Dickinson <dickinsm@gmail.com> parents: 58249 diff changeset	1456 dd = -1;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1457 else {
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1458 i = 0;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1459 for(;;) {
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1460 b = multadd(b, 10, 0);
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1461 if (b == NULL) {
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1462 Bfree(d);
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1463 return -1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1464 }
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1465 dd = s0[i < nd0 ? i : i+1] - '0' - quorem(b, d);
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1466 i++;
58317 76fb7dbd7388 Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. Mark Dickinson <dickinsm@gmail.com> parents: 58316 diff changeset	1467
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1468 if (dd)
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1469 break;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1470 if (!b->x[0] && b->wds == 1) {
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1471 /* b/d == 0 */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1472 dd = i < nd;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1473 break;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1474 }
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1475 if (!(i < nd)) {
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1476 /* b/d != 0, but digits of s0 exhausted */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1477 dd = -1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1478 break;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1479 }
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1480 }
58310 b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	1481 }
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1482 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1483 Bfree(d);
58317 76fb7dbd7388 Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. Mark Dickinson <dickinsm@gmail.com> parents: 58316 diff changeset	1484 if (dd > 0 \|\| (dd == 0 && odd))
58308 0f974bb238ed Simplify and annotate the bigcomp function, removing unused special cases. Mark Dickinson <dickinsm@gmail.com> parents: 58305 diff changeset	1485 dval(rv) += sulp(rv, bc);
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1486 return 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1487 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1488
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1489 double
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1490 _Py_dg_strtod(const char s00, char *se)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1491 {
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1492 int bb2, bb5, bbe, bd2, bd5, bs2, c, dsign, e, e1, error;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1493 int esign, i, j, k, lz, nd, nd0, odd, sign;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1494 const char s, s0, *s1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1495 double aadj, aadj1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1496 U aadj2, adj, rv, rv0;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1497 ULong y, z, abs_exp;
58358 5c32f3b65d21 Fix multiple uses of variable 'L' in _Py_dg_strtod, where one use requires an unsigned long and the other a signed long. See also r77421. Mark Dickinson <dickinsm@gmail.com> parents: 58356 diff changeset	1498 Long L;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1499 BCinfo bc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1500 Bigint bb, bb1, bd, bd0, bs, delta;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1501
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1502 dval(&rv) = 0.;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1503
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1504 /* Start parsing. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1505 c = *(s = s00);
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1506
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1507 /* Parse optional sign, if present. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1508 sign = 0;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1509 switch (c) {
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1510 case '-':
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1511 sign = 1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1512 /* no break */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1513 case '+':
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1514 c = *++s;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1515 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1516
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1517 /* Skip leading zeros: lz is true iff there were leading zeros. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1518 s1 = s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1519 while (c == '0')
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1520 c = *++s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1521 lz = s != s1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1522
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1523 /* Point s0 at the first nonzero digit (if any). nd0 will be the position
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1524 of the point relative to s0. nd will be the total number of digits
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1525 ignoring leading zeros. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1526 s0 = s1 = s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1527 while ('0' <= c && c <= '9')
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1528 c = *++s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1529 nd0 = nd = s - s1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1530
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1531 /* Parse decimal point and following digits. */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1532 if (c == '.') {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1533 c = *++s;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1534 if (!nd) {
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1535 s1 = s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1536 while (c == '0')
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1537 c = *++s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1538 lz = lz \|\| s != s1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1539 nd0 -= s - s1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1540 s0 = s;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1541 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1542 s1 = s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1543 while ('0' <= c && c <= '9')
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1544 c = *++s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1545 nd += s - s1;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1546 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1547
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1548 /* Now lz is true if and only if there were leading zero digits, and nd
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1549 gives the total number of digits ignoring leading zeros. A valid input
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1550 must have at least one digit. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1551 if (!nd && !lz) {
58420 5dbbc43c591b Don't try to put a value into a NULL pointer. Mark Dickinson <dickinsm@gmail.com> parents: 58419 diff changeset	1552 if (se)
5dbbc43c591b Don't try to put a value into a NULL pointer. Mark Dickinson <dickinsm@gmail.com> parents: 58419 diff changeset	1553 se = (char )s00;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1554 goto parse_error;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1555 }
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1556
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1557 /* Parse exponent. */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1558 e = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1559 if (c == 'e' \|\| c == 'E') {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1560 s00 = s;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1561 c = *++s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1562
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1563 /* Exponent sign. */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1564 esign = 0;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1565 switch (c) {
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1566 case '-':
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1567 esign = 1;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1568 /* no break */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1569 case '+':
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1570 c = *++s;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1571 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1572
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1573 /* Skip zeros. lz is true iff there are leading zeros. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1574 s1 = s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1575 while (c == '0')
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1576 c = *++s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1577 lz = s != s1;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1578
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1579 /* Get absolute value of the exponent. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1580 s1 = s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1581 abs_exp = 0;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1582 while ('0' <= c && c <= '9') {
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1583 abs_exp = 10*abs_exp + (c - '0');
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1584 c = *++s;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1585 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1586
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1587 /* abs_exp will be correct modulo 232. But 109 < 2**32, so if
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1588 there are at most 9 significant exponent digits then overflow is
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1589 impossible. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1590 if (s - s1 > 9 \|\| abs_exp > MAX_ABS_EXP)
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1591 e = (int)MAX_ABS_EXP;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1592 else
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1593 e = (int)abs_exp;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1594 if (esign)
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1595 e = -e;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1596
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1597 /* A valid exponent must have at least one digit. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1598 if (s == s1 && !lz)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1599 s = s00;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1600 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1601
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1602 /* Adjust exponent to take into account position of the point. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1603 e -= nd - nd0;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1604 if (nd0 <= 0)
58356 8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1605 nd0 = nd;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1606
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1607 /* Finished parsing. Set se to indicate how far we parsed */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1608 if (se)
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1609 se = (char )s;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1610
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1611 /* If all digits were zero, exit with return value +-0.0. Otherwise,
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1612 strip trailing zeros: scan back until we hit a nonzero digit. */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1613 if (!nd)
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1614 goto ret;
58356 8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1615 for (i = nd; i > 0; ) {
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1616 --i;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1617 if (s0[i < nd0 ? i : i+1] != '0') {
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1618 ++i;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1619 break;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1620 }
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1621 }
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1622 e += nd - i;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1623 nd = i;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1624 if (nd0 > nd)
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1625 nd0 = nd;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1626
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1627 /* Summary of parsing results. After parsing, and dealing with zero
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1628 * inputs, we have values s0, nd0, nd, e, sign, where:
58356 8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1629 *
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1630 * - s0 points to the first significant digit of the input string
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1631 *
58356 8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1632 * - nd is the total number of significant digits (here, and
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1633 * below, 'significant digits' means the set of digits of the
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1634 * significand of the input that remain after ignoring leading
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1635 * and trailing zeros).
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1636 *
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1637 * - nd0 indicates the position of the decimal point, if present; it
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1638 * satisfies 1 <= nd0 <= nd. The nd significant digits are in
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1639 * s0[0:nd0] and s0[nd0+1:nd+1] using the usual Python half-open slice
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1640 * notation. (If nd0 < nd, then s0[nd0] contains a '.' character; if
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1641 * nd0 == nd, then s0[nd0] could be any non-digit character.)
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1642 *
58356 8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1643 * - e is the adjusted exponent: the absolute value of the number
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1644 * represented by the original input string is n * 10**e, where
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1645 * n is the integer represented by the concatenation of
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1646 * s0[0:nd0] and s0[nd0+1:nd+1]
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1647 *
58356 8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1648 * - sign gives the sign of the input: 1 for negative, 0 for positive
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1649 *
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1650 * - the first and last significant digits are nonzero
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1651 */
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1652
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1653 /* put first DBL_DIG+1 digits into integer y and z.
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1654 *
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1655 * - y contains the value represented by the first min(9, nd)
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1656 * significant digits
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1657 *
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1658 * - if nd > 9, z contains the value represented by significant digits
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1659 * with indices in [9, min(16, nd)). So y * 10**(min(16, nd) - 9) + z
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1660 * gives the value represented by the first min(16, nd) sig. digits.
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1661 */
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1662
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1663 bc.e0 = e1 = e;
58356 8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1664 y = z = 0;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1665 for (i = 0; i < nd; i++) {
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1666 if (i < 9)
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1667 y = 10*y + s0[i < nd0 ? i : i+1] - '0';
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1668 else if (i < DBL_DIG+1)
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1669 z = 10*z + s0[i < nd0 ? i : i+1] - '0';
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1670 else
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1671 break;
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1672 }
8e179a0fcb5e Issue #7632: Fix one more case of incorrect rounding for str -> float Mark Dickinson <dickinsm@gmail.com> parents: 58345 diff changeset	1673
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1674 k = nd < DBL_DIG + 1 ? nd : DBL_DIG + 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1675 dval(&rv) = y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1676 if (k > 9) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1677 dval(&rv) = tens[k - 9] * dval(&rv) + z;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1678 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1679 bd0 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1680 if (nd <= DBL_DIG
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1681 && Flt_Rounds == 1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1682 ) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1683 if (!e)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1684 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1685 if (e > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1686 if (e <= Ten_pmax) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1687 dval(&rv) *= tens[e];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1688 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1689 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1690 i = DBL_DIG - nd;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1691 if (e <= Ten_pmax + i) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1692 /* A fancier test would sometimes let us do
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1693 * this for larger i values.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1694 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1695 e -= i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1696 dval(&rv) *= tens[i];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1697 dval(&rv) *= tens[e];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1698 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1699 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1700 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1701 else if (e >= -Ten_pmax) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1702 dval(&rv) /= tens[-e];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1703 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1704 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1705 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1706 e1 += nd - k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1707
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1708 bc.scale = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1709
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1710 /* Get starting approximation = rv * 10*e1 /
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1711
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1712 if (e1 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1713 if ((i = e1 & 15))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1714 dval(&rv) *= tens[i];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1715 if (e1 &= ~15) {
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1716 if (e1 > DBL_MAX_10_EXP)
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1717 goto ovfl;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1718 e1 >>= 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1719 for(j = 0; e1 > 1; j++, e1 >>= 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1720 if (e1 & 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1721 dval(&rv) *= bigtens[j];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1722 /* The last multiplication could overflow. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1723 word0(&rv) -= P*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1724 dval(&rv) *= bigtens[j];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1725 if ((z = word0(&rv) & Exp_mask)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1726 > Exp_msk1*(DBL_MAX_EXP+Bias-P))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1727 goto ovfl;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1728 if (z > Exp_msk1*(DBL_MAX_EXP+Bias-1-P)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1729 /* set to largest number */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1730 /* (Can't trust DBL_MAX) */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1731 word0(&rv) = Big0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1732 word1(&rv) = Big1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1733 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1734 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1735 word0(&rv) += P*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1736 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1737 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1738 else if (e1 < 0) {
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1739 /* The input decimal value lies in [10e1, 10(e1+16)).
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1740
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1741 If e1 <= -512, underflow immediately.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1742 If e1 <= -256, set bc.scale to 2*P.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1743
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1744 So for input value < 1e-256, bc.scale is always set;
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1745 for input value >= 1e-240, bc.scale is never set.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1746 For input values in [1e-256, 1e-240), bc.scale may or may
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1747 not be set. */
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1748
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1749 e1 = -e1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1750 if ((i = e1 & 15))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1751 dval(&rv) /= tens[i];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1752 if (e1 >>= 4) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1753 if (e1 >= 1 << n_bigtens)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1754 goto undfl;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1755 if (e1 & Scale_Bit)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1756 bc.scale = 2*P;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1757 for(j = 0; e1 > 0; j++, e1 >>= 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1758 if (e1 & 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1759 dval(&rv) *= tinytens[j];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1760 if (bc.scale && (j = 2*P + 1 - ((word0(&rv) & Exp_mask)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1761 >> Exp_shift)) > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1762 /* scaled rv is denormal; clear j low bits */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1763 if (j >= 32) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1764 word1(&rv) = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1765 if (j >= 53)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1766 word0(&rv) = (P+2)*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1767 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1768 word0(&rv) &= 0xffffffff << (j-32);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1769 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1770 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1771 word1(&rv) &= 0xffffffff << j;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1772 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1773 if (!dval(&rv))
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1774 goto undfl;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1775 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1776 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1777
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1778 /* Now the hard part -- adjusting rv to the correct value.*/
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1779
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1780 /* Put digits into bd: true value = bd * 10^e */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1781
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1782 bc.nd = nd;
58239 3e1712221fa6 Remove unused BCinfo fields and an unused macro. Mark Dickinson <dickinsm@gmail.com> parents: 58151 diff changeset	1783 bc.nd0 = nd0; /* Only needed if nd > STRTOD_DIGLIM, but done here */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1784 /* to silence an erroneous warning about bc.nd0 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1785 /* possibly not being initialized. */
58239 3e1712221fa6 Remove unused BCinfo fields and an unused macro. Mark Dickinson <dickinsm@gmail.com> parents: 58151 diff changeset	1786 if (nd > STRTOD_DIGLIM) {
3e1712221fa6 Remove unused BCinfo fields and an unused macro. Mark Dickinson <dickinsm@gmail.com> parents: 58151 diff changeset	1787 /* ASSERT(STRTOD_DIGLIM >= 18); 18 == one more than the */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1788 /* minimum number of decimal digits to distinguish double values */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1789 /* in IEEE arithmetic. */
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1790
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1791 /* Truncate input to 18 significant digits, then discard any trailing
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1792 zeros on the result by updating nd, nd0, e and y suitably. (There's
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1793 no need to update z; it's not reused beyond this point.) */
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1794 for (i = 18; i > 0; ) {
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1795 /* scan back until we hit a nonzero digit. significant digit 'i'
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1796 is s0[i] if i < nd0, s0[i+1] if i >= nd0. */
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1797 --i;
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1798 if (s0[i < nd0 ? i : i+1] != '0') {
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1799 ++i;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1800 break;
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1801 }
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1802 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1803 e += nd - i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1804 nd = i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1805 if (nd0 > nd)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1806 nd0 = nd;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1807 if (nd < 9) { /* must recompute y */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1808 y = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1809 for(i = 0; i < nd0; ++i)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1810 y = 10*y + s0[i] - '0';
58345 5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1811 for(; i < nd; ++i)
5673dc3b6432 Issue #7632: Fix a serious wrong output bug for string -> float conversion. Mark Dickinson <dickinsm@gmail.com> parents: 58318 diff changeset	1812 y = 10*y + s0[i+1] - '0';
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1813 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1814 }
58310 b39a0219f727 More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. Mark Dickinson <dickinsm@gmail.com> parents: 58309 diff changeset	1815 bd0 = s2b(s0, nd0, nd, y);
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1816 if (bd0 == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1817 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1818
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1819 /* Notation for the comments below. Write:
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1820
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1821 - dv for the absolute value of the number represented by the original
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1822 decimal input string.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1823
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1824 - if we've truncated dv, write tdv for the truncated value.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1825 Otherwise, set tdv == dv.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1826
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1827 - srv for the quantity rv/2^bc.scale; so srv is the current binary
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1828 approximation to tdv (and dv). It should be exactly representable
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1829 in an IEEE 754 double.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1830 */
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1831
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1832 for(;;) {
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1833
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1834 /* This is the main correction loop for _Py_dg_strtod.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1835
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1836 We've got a decimal value tdv, and a floating-point approximation
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1837 srv=rv/2^bc.scale to tdv. The aim is to determine whether srv is
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1838 close enough (i.e., within 0.5 ulps) to tdv, and to compute a new
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1839 approximation if not.
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1840
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1841 To determine whether srv is close enough to tdv, compute integers
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1842 bd, bb and bs proportional to tdv, srv and 0.5 ulp(srv)
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1843 respectively, and then use integer arithmetic to determine whether
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1844 \|tdv - srv\| is less than, equal to, or greater than 0.5 ulp(srv).
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1845 */
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1846
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1847 bd = Balloc(bd0->k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1848 if (bd == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1849 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1850 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1851 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1852 Bcopy(bd, bd0);
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1853 bb = sd2b(&rv, bc.scale, &bbe); /* srv = bb * 2^bbe */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1854 if (bb == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1855 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1856 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1857 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1858 }
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1859 /* Record whether lsb of bb is odd, in case we need this
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1860 for the round-to-even step later. */
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1861 odd = bb->x[0] & 1;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1862
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1863 /* tdv = bd * 10*e; srv = bb 2*bbe /
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1864 bs = i2b(1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1865 if (bs == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1866 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1867 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1868 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1869 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1870 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1871
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1872 if (e >= 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1873 bb2 = bb5 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1874 bd2 = bd5 = e;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1875 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1876 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1877 bb2 = bb5 = -e;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1878 bd2 = bd5 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1879 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1880 if (bbe >= 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1881 bb2 += bbe;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1882 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1883 bd2 -= bbe;
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1884 bs2 = bb2;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1885 bb2++;
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1886 bd2++;
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1887
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1888 /* At this stage bd5 - bb5 == e == bd2 - bb2 + bbe, bb2 - bs2 == 1,
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1889 and bs == 1, so:
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1890
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1891 tdv == bd * 10*e = bd 2*(bbe - bb2 + bd2) 5**(bd5 - bb5)
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1892 srv == bb * 2*bbe = bb 2**(bbe - bb2 + bb2)
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1893 0.5 ulp(srv) == 2*(bbe-1) = bs 2**(bbe - bb2 + bs2)
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1894
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1895 It follows that:
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1896
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1897 M * tdv = bd * 2*bd2 5**bd5
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1898 M * srv = bb * 2*bb2 5**bb5
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1899 M * 0.5 ulp(srv) = bs * 2*bs2 5**bb5
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1900
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1901 for some constant M. (Actually, M == 2*(bb2 - bbe) 5**bb5, but
7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1902 this fact is not needed below.)
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1903 */
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1904
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	1905 /* Remove factor of 2*i, where i = min(bb2, bd2, bs2). /
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1906 i = bb2 < bd2 ? bb2 : bd2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1907 if (i > bs2)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1908 i = bs2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1909 if (i > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1910 bb2 -= i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1911 bd2 -= i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1912 bs2 -= i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1913 }
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1914
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1915 /* Scale bb, bd, bs by the appropriate powers of 2 and 5. */
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1916 if (bb5 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1917 bs = pow5mult(bs, bb5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1918 if (bs == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1919 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1920 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1921 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1922 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1923 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1924 bb1 = mult(bs, bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1925 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1926 bb = bb1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1927 if (bb == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1928 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1929 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1930 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1931 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1932 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1933 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1934 if (bb2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1935 bb = lshift(bb, bb2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1936 if (bb == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1937 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1938 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1939 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1940 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1941 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1942 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1943 if (bd5 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1944 bd = pow5mult(bd, bd5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1945 if (bd == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1946 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1947 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1948 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1949 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1950 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1951 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1952 if (bd2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1953 bd = lshift(bd, bd2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1954 if (bd == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1955 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1956 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1957 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1958 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1959 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1960 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1961 if (bs2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1962 bs = lshift(bs, bs2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1963 if (bs == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1964 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1965 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1966 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1967 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1968 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1969 }
58421 886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1970
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1971 /* Now bd, bb and bs are scaled versions of tdv, srv and 0.5 ulp(srv),
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1972 respectively. Compute the difference \|tdv - srv\|, and compare
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1973 with 0.5 ulp(srv). */
886320f1ba82 Additional explanatory comments for _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58420 diff changeset	1974
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1975 delta = diff(bb, bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1976 if (delta == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1977 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1978 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1979 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1980 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1981 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1982 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1983 dsign = delta->sign;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1984 delta->sign = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1985 i = cmp(delta, bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1986 if (bc.nd > nd && i <= 0) {
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	1987 if (dsign)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	1988 break; /* Must use bigcomp(). */
58318 92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1989
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1990 /* Here rv overestimates the truncated decimal value by at most
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1991 0.5 ulp(rv). Hence rv either overestimates the true decimal
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1992 value by <= 0.5 ulp(rv), or underestimates it by some small
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1993 amount (< 0.1 ulp(rv)); either way, rv is within 0.5 ulps of
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1994 the true decimal value, so it's possible to exit.
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1995
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1996 Exception: if scaled rv is a normal exact power of 2, but not
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1997 DBL_MIN, then rv - 0.5 ulp(rv) takes us all the way down to the
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1998 next double, so the correctly rounded result is either rv - 0.5
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	1999 ulp(rv) or rv; in this case, use bigcomp to distinguish. */
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2000
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2001 if (!word1(&rv) && !(word0(&rv) & Bndry_mask)) {
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2002 /* rv can't be 0, since it's an overestimate for some
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2003 nonzero value. So rv is a normal power of 2. */
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2004 j = (int)(word0(&rv) & Exp_mask) >> Exp_shift;
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2005 /* rv / 2^bc.scale = 2^(j - 1023 - bc.scale); use bigcomp if
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2006 rv / 2^bc.scale >= 2^-1021. */
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2007 if (j - bc.scale >= 2) {
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2008 dval(&rv) -= 0.5 * sulp(&rv, &bc);
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2009 break; /* Use bigcomp. */
58318 92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2010 }
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2011 }
92384d7f425a Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) Mark Dickinson <dickinsm@gmail.com> parents: 58317 diff changeset	2012
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2013 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2014 bc.nd = nd;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2015 i = -1; /* Discarded digits make delta smaller. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2016 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2017 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2018
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2019 if (i < 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2020 /* Error is less than half an ulp -- check for
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2021 * special case of mantissa a power of two.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2022 */
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2023 if (dsign \|\| word1(&rv) \|\| word0(&rv) & Bndry_mask
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2024 \|\| (word0(&rv) & Exp_mask) <= (2P+1)Exp_msk1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2025 ) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2026 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2027 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2028 if (!delta->x[0] && delta->wds <= 1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2029 /* exact result */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2030 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2031 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2032 delta = lshift(delta,Log2P);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2033 if (delta == NULL) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2034 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2035 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2036 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2037 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2038 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2039 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2040 if (cmp(delta, bs) > 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2041 goto drop_down;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2042 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2043 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2044 if (i == 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2045 /* exactly half-way between */
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2046 if (dsign) {
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2047 if ((word0(&rv) & Bndry_mask1) == Bndry_mask1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2048 && word1(&rv) == (
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2049 (bc.scale &&
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2050 (y = word0(&rv) & Exp_mask) <= 2PExp_msk1) ?
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2051 (0xffffffff & (0xffffffff << (2*P+1-(y>>Exp_shift)))) :
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2052 0xffffffff)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2053 /boundary case -- increment exponent/
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2054 word0(&rv) = (word0(&rv) & Exp_mask)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2055 + Exp_msk1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2056 ;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2057 word1(&rv) = 0;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2058 dsign = 0;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2059 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2060 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2061 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2062 else if (!(word0(&rv) & Bndry_mask) && !word1(&rv)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2063 drop_down:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2064 /* boundary case -- decrement exponent */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2065 if (bc.scale) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2066 L = word0(&rv) & Exp_mask;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2067 if (L <= (2P+1)Exp_msk1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2068 if (L > (P+2)*Exp_msk1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2069 /* round even ==> */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2070 /* accept rv */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2071 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2072 /* rv = smallest denormal */
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2073 if (bc.nd > nd)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2074 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2075 goto undfl;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2076 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2077 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2078 L = (word0(&rv) & Exp_mask) - Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2079 word0(&rv) = L \| Bndry_mask1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2080 word1(&rv) = 0xffffffff;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2081 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2082 }
58444 7a9f36cc6df1 Issue #7743: Fix a potential incorrect rounding bug in dtoa.c (2nd bug Mark Dickinson <dickinsm@gmail.com> parents: 58421 diff changeset	2083 if (!odd)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2084 break;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2085 if (dsign)
58459 b40a5a568e76 dtoa.c fix from upstream that fixes incorrectly rounded results for certain subnormals that are also halfway cases. Mark Dickinson <dickinsm@gmail.com> parents: 58458 diff changeset	2086 dval(&rv) += sulp(&rv, &bc);
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2087 else {
58459 b40a5a568e76 dtoa.c fix from upstream that fixes incorrectly rounded results for certain subnormals that are also halfway cases. Mark Dickinson <dickinsm@gmail.com> parents: 58458 diff changeset	2088 dval(&rv) -= sulp(&rv, &bc);
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2089 if (!dval(&rv)) {
58239 3e1712221fa6 Remove unused BCinfo fields and an unused macro. Mark Dickinson <dickinsm@gmail.com> parents: 58151 diff changeset	2090 if (bc.nd >nd)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2091 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2092 goto undfl;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2093 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2094 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2095 dsign = 1 - dsign;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2096 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2097 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2098 if ((aadj = ratio(delta, bs)) <= 2.) {
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2099 if (dsign)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2100 aadj = aadj1 = 1.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2101 else if (word1(&rv) \|\| word0(&rv) & Bndry_mask) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2102 if (word1(&rv) == Tiny1 && !word0(&rv)) {
58239 3e1712221fa6 Remove unused BCinfo fields and an unused macro. Mark Dickinson <dickinsm@gmail.com> parents: 58151 diff changeset	2103 if (bc.nd >nd)
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2104 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2105 goto undfl;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2106 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2107 aadj = 1.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2108 aadj1 = -1.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2109 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2110 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2111 /* special case -- power of FLT_RADIX to be */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2112 /* rounded down... */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2113
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2114 if (aadj < 2./FLT_RADIX)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2115 aadj = 1./FLT_RADIX;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2116 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2117 aadj *= 0.5;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2118 aadj1 = -aadj;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2119 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2120 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2121 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2122 aadj *= 0.5;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2123 aadj1 = dsign ? aadj : -aadj;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2124 if (Flt_Rounds == 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2125 aadj1 += 0.5;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2126 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2127 y = word0(&rv) & Exp_mask;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2128
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2129 /* Check for overflow */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2130
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2131 if (y == Exp_msk1*(DBL_MAX_EXP+Bias-1)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2132 dval(&rv0) = dval(&rv);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2133 word0(&rv) -= P*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2134 adj.d = aadj1 * ulp(&rv);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2135 dval(&rv) += adj.d;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2136 if ((word0(&rv) & Exp_mask) >=
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2137 Exp_msk1*(DBL_MAX_EXP+Bias-P)) {
58390 7322c5691294 Issue #7632: Fix a memory leak in _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58358 diff changeset	2138 if (word0(&rv0) == Big0 && word1(&rv0) == Big1) {
7322c5691294 Issue #7632: Fix a memory leak in _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58358 diff changeset	2139 Bfree(bb);
7322c5691294 Issue #7632: Fix a memory leak in _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58358 diff changeset	2140 Bfree(bd);
7322c5691294 Issue #7632: Fix a memory leak in _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58358 diff changeset	2141 Bfree(bs);
7322c5691294 Issue #7632: Fix a memory leak in _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58358 diff changeset	2142 Bfree(bd0);
7322c5691294 Issue #7632: Fix a memory leak in _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58358 diff changeset	2143 Bfree(delta);
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2144 goto ovfl;
58390 7322c5691294 Issue #7632: Fix a memory leak in _Py_dg_strtod. Mark Dickinson <dickinsm@gmail.com> parents: 58358 diff changeset	2145 }
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2146 word0(&rv) = Big0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2147 word1(&rv) = Big1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2148 goto cont;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2149 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2150 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2151 word0(&rv) += P*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2152 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2153 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2154 if (bc.scale && y <= 2PExp_msk1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2155 if (aadj <= 0x7fffffff) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2156 if ((z = (ULong)aadj) <= 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2157 z = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2158 aadj = z;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2159 aadj1 = dsign ? aadj : -aadj;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2160 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2161 dval(&aadj2) = aadj1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2162 word0(&aadj2) += (2P+1)Exp_msk1 - y;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2163 aadj1 = dval(&aadj2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2164 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2165 adj.d = aadj1 * ulp(&rv);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2166 dval(&rv) += adj.d;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2167 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2168 z = word0(&rv) & Exp_mask;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2169 if (bc.nd == nd) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2170 if (!bc.scale)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2171 if (y == z) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2172 /* Can we stop now? */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2173 L = (Long)aadj;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2174 aadj -= L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2175 /* The tolerances below are conservative. */
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2176 if (dsign \|\| word1(&rv) \|\| word0(&rv) & Bndry_mask) {
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2177 if (aadj < .4999999 \|\| aadj > .5000001)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2178 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2179 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2180 else if (aadj < .4999999/FLT_RADIX)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2181 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2182 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2183 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2184 cont:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2185 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2186 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2187 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2188 Bfree(delta);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2189 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2190 Bfree(bb);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2191 Bfree(bd);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2192 Bfree(bs);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2193 Bfree(bd0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2194 Bfree(delta);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2195 if (bc.nd > nd) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2196 error = bigcomp(&rv, s0, &bc);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2197 if (error)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2198 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2199 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2200
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2201 if (bc.scale) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2202 word0(&rv0) = Exp_1 - 2PExp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2203 word1(&rv0) = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2204 dval(&rv) *= dval(&rv0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2205 }
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2206
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2207 ret:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2208 return sign ? -dval(&rv) : dval(&rv);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2209
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2210 parse_error:
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2211 return 0.0;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2212
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2213 failed_malloc:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2214 errno = ENOMEM;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2215 return -1.0;
58419 bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2216
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2217 undfl:
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2218 return sign ? -0.0 : 0.0;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2219
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2220 ovfl:
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2221 errno = ERANGE;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2222 /* Can't trust HUGE_VAL */
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2223 word0(&rv) = Exp_mask;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2224 word1(&rv) = 0;
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2225 return sign ? -dval(&rv) : dval(&rv);
bac821dffea8 Various dtoa.c cleanups. 1. Despagghetify _Py_dg_strtod parsing code Mark Dickinson <dickinsm@gmail.com> parents: 58401 diff changeset	2226
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2227 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2228
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2229 static char *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2230 rv_alloc(int i)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2231 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2232 int j, k, *r;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2233
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2234 j = sizeof(ULong);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2235 for(k = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2236 sizeof(Bigint) - sizeof(ULong) - sizeof(int) + j <= (unsigned)i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2237 j <<= 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2238 k++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2239 r = (int*)Balloc(k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2240 if (r == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2241 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2242 *r = k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2243 return (char *)(r+1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2244 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2245
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2246 static char *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2247 nrv_alloc(char s, char *rve, int n)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2248 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2249 char rv, t;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2250
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2251 rv = rv_alloc(n);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2252 if (rv == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2253 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2254 t = rv;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2255 while((t = s++)) t++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2256 if (rve)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2257 *rve = t;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2258 return rv;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2259 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2260
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2261 /* freedtoa(s) must be used to free values s returned by dtoa
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2262 * when MULTIPLE_THREADS is #defined. It should be used in all cases,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2263 * but for consistency with earlier versions of dtoa, it is optional
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2264 * when MULTIPLE_THREADS is not defined.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2265 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2266
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2267 void
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2268 _Py_dg_freedtoa(char *s)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2269 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2270 Bigint b = (Bigint )((int *)s - 1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2271 b->maxwds = 1 << (b->k = (int)b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2272 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2273 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2274
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2275 /* dtoa for IEEE arithmetic (dmg): convert double to ASCII string.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2276 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2277 * Inspired by "How to Print Floating-Point Numbers Accurately" by
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2278 * Guy L. Steele, Jr. and Jon L. White [Proc. ACM SIGPLAN '90, pp. 112-126].
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2279 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2280 * Modifications:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2281 * 1. Rather than iterating, we use a simple numeric overestimate
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2282 * to determine k = floor(log10(d)). We scale relevant
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2283 * quantities using O(log2(k)) rather than O(k) multiplications.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2284 * 2. For some modes > 2 (corresponding to ecvt and fcvt), we don't
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2285 * try to generate digits strictly left to right. Instead, we
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2286 * compute with fewer bits and propagate the carry if necessary
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2287 * when rounding the final digit up. This is often faster.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2288 * 3. Under the assumption that input will be rounded nearest,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2289 * mode 0 renders 1e23 as 1e23 rather than 9.999999999999999e22.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2290 * That is, we allow equality in stopping tests when the
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2291 * round-nearest rule will give the same floating-point value
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2292 * as would satisfaction of the stopping test with strict
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2293 * inequality.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2294 * 4. We remove common factors of powers of 2 from relevant
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2295 * quantities.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2296 * 5. When converting floating-point integers less than 1e16,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2297 * we use floating-point arithmetic rather than resorting
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2298 * to multiple-precision integers.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2299 * 6. When asked to produce fewer than 15 digits, we first try
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2300 * to get by with floating-point arithmetic; we resort to
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2301 * multiple-precision integer arithmetic only if we cannot
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2302 * guarantee that the floating-point calculation has given
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2303 * the correctly rounded result. For k requested digits and
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2304 * "uniformly" distributed input, the probability is
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2305 * something like 10^(k-15) that we must resort to the Long
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2306 * calculation.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2307 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2308
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2309 /* Additional notes (METD): (1) returns NULL on failure. (2) to avoid memory
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2310 leakage, a successful call to _Py_dg_dtoa should always be matched by a
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2311 call to _Py_dg_freedtoa. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2312
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2313 char *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2314 _Py_dg_dtoa(double dd, int mode, int ndigits,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2315 int decpt, int sign, char **rve)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2316 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2317 /* Arguments ndigits, decpt, sign are similar to those
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2318 of ecvt and fcvt; trailing zeros are suppressed from
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2319 the returned string. If not null, *rve is set to point
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2320 to the end of the return value. If d is +-Infinity or NaN,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2321 then *decpt is set to 9999.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2322
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2323 mode:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2324 0 ==> shortest string that yields d when read in
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2325 and rounded to nearest.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2326 1 ==> like 0, but with Steele & White stopping rule;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2327 e.g. with IEEE P754 arithmetic , mode 0 gives
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2328 1e23 whereas mode 1 gives 9.999999999999999e22.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2329 2 ==> max(1,ndigits) significant digits. This gives a
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2330 return value similar to that of ecvt, except
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2331 that trailing zeros are suppressed.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2332 3 ==> through ndigits past the decimal point. This
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2333 gives a return value similar to that from fcvt,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2334 except that trailing zeros are suppressed, and
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2335 ndigits can be negative.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2336 4,5 ==> similar to 2 and 3, respectively, but (in
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2337 round-nearest mode) with the tests of mode 0 to
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2338 possibly return a shorter string that rounds to d.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2339 With IEEE arithmetic and compilation with
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2340 -DHonor_FLT_ROUNDS, modes 4 and 5 behave the same
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2341 as modes 2 and 3 when FLT_ROUNDS != 1.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2342 6-9 ==> Debugging modes similar to mode - 4: don't try
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2343 fast floating-point estimate (if applicable).
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2344
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2345 Values of mode other than 0-9 are treated as mode 0.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2346
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2347 Sufficient space is allocated to the return value
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2348 to hold the suppressed trailing zeros.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2349 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2350
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2351 int bbits, b2, b5, be, dig, i, ieps, ilim, ilim0, ilim1,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2352 j, j1, k, k0, k_check, leftright, m2, m5, s2, s5,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2353 spec_case, try_quick;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2354 Long L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2355 int denorm;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2356 ULong x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2357 Bigint b, b1, delta, mlo, mhi, S;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2358 U d2, eps, u;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2359 double ds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2360 char s, s0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2361
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2362 /* set pointers to NULL, to silence gcc compiler warnings and make
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2363 cleanup easier on error */
61267 5cea27275af1 Remove three unneeded variable assignments. Brett Cannon <bcannon@gmail.com> parents: 58459 diff changeset	2364 mlo = mhi = S = 0;
56700 2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2365 s0 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2366
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2367 u.d = dd;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2368 if (word0(&u) & Sign_bit) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2369 /* set sign for everything, including 0's and NaNs */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2370 *sign = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2371 word0(&u) &= ~Sign_bit; /* clear sign bit */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2372 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2373 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2374 *sign = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2375
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2376 /* quick return for Infinities, NaNs and zeros */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2377 if ((word0(&u) & Exp_mask) == Exp_mask)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2378 {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2379 /* Infinity or NaN */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2380 *decpt = 9999;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2381 if (!word1(&u) && !(word0(&u) & 0xfffff))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2382 return nrv_alloc("Infinity", rve, 8);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2383 return nrv_alloc("NaN", rve, 3);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2384 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2385 if (!dval(&u)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2386 *decpt = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2387 return nrv_alloc("0", rve, 1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2388 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2389
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2390 /* compute k = floor(log10(d)). The computation may leave k
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2391 one too large, but should never leave k too small. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2392 b = d2b(&u, &be, &bbits);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2393 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2394 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2395 if ((i = (int)(word0(&u) >> Exp_shift1 & (Exp_mask>>Exp_shift1)))) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2396 dval(&d2) = dval(&u);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2397 word0(&d2) &= Frac_mask1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2398 word0(&d2) \|= Exp_11;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2399
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2400 /* log(x) ~=~ log(1.5) + (x-1.5)/1.5
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2401 * log10(x) = log(x) / log(10)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2402 * ~=~ log(1.5)/log(10) + (x-1.5)/(1.5*log(10))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2403 * log10(d) = (i-Bias)*log(2)/log(10) + log10(d2)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2404 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2405 * This suggests computing an approximation k to log10(d) by
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2406 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2407 * k = (i - Bias)*0.301029995663981
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2408 * + ( (d2-1.5)*0.289529654602168 + 0.176091259055681 );
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2409 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2410 * We want k to be too large rather than too small.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2411 * The error in the first-order Taylor series approximation
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2412 * is in our favor, so we just round up the constant enough
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2413 * to compensate for any error in the multiplication of
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2414 * (i - Bias) by 0.301029995663981; since \|i - Bias\| <= 1077,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2415 * and 1077 * 0.30103 * 2^-52 ~=~ 7.2e-14,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2416 * adding 1e-13 to the constant term more than suffices.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2417 * Hence we adjust the constant term to 0.1760912590558.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2418 * (We could get a more accurate k by invoking log10,
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2419 * but this is probably not worthwhile.)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2420 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2421
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2422 i -= Bias;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2423 denorm = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2424 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2425 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2426 /* d is denormalized */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2427
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2428 i = bbits + be + (Bias + (P-1) - 1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2429 x = i > 32 ? word0(&u) << (64 - i) \| word1(&u) >> (i - 32)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2430 : word1(&u) << (32 - i);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2431 dval(&d2) = x;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2432 word0(&d2) -= 31Exp_msk1; / adjust exponent */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2433 i -= (Bias + (P-1) - 1) + 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2434 denorm = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2435 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2436 ds = (dval(&d2)-1.5)*0.289529654602168 + 0.1760912590558 +
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2437 i*0.301029995663981;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2438 k = (int)ds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2439 if (ds < 0. && ds != k)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2440 k--; /* want k = floor(ds) */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2441 k_check = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2442 if (k >= 0 && k <= Ten_pmax) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2443 if (dval(&u) < tens[k])
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2444 k--;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2445 k_check = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2446 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2447 j = bbits - i - 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2448 if (j >= 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2449 b2 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2450 s2 = j;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2451 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2452 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2453 b2 = -j;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2454 s2 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2455 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2456 if (k >= 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2457 b5 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2458 s5 = k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2459 s2 += k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2460 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2461 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2462 b2 -= k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2463 b5 = -k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2464 s5 = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2465 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2466 if (mode < 0 \|\| mode > 9)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2467 mode = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2468
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2469 try_quick = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2470
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2471 if (mode > 5) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2472 mode -= 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2473 try_quick = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2474 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2475 leftright = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2476 ilim = ilim1 = -1; /* Values for cases 0 and 1; done here to */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2477 /* silence erroneous "gcc -Wall" warning. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2478 switch(mode) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2479 case 0:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2480 case 1:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2481 i = 18;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2482 ndigits = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2483 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2484 case 2:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2485 leftright = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2486 /* no break */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2487 case 4:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2488 if (ndigits <= 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2489 ndigits = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2490 ilim = ilim1 = i = ndigits;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2491 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2492 case 3:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2493 leftright = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2494 /* no break */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2495 case 5:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2496 i = ndigits + k + 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2497 ilim = i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2498 ilim1 = i - 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2499 if (i <= 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2500 i = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2501 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2502 s0 = rv_alloc(i);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2503 if (s0 == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2504 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2505 s = s0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2506
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2507
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2508 if (ilim >= 0 && ilim <= Quick_max && try_quick) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2509
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2510 /* Try to get by with floating-point arithmetic. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2511
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2512 i = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2513 dval(&d2) = dval(&u);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2514 k0 = k;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2515 ilim0 = ilim;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2516 ieps = 2; /* conservative */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2517 if (k > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2518 ds = tens[k&0xf];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2519 j = k >> 4;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2520 if (j & Bletch) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2521 /* prevent overflows */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2522 j &= Bletch - 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2523 dval(&u) /= bigtens[n_bigtens-1];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2524 ieps++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2525 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2526 for(; j; j >>= 1, i++)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2527 if (j & 1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2528 ieps++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2529 ds *= bigtens[i];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2530 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2531 dval(&u) /= ds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2532 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2533 else if ((j1 = -k)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2534 dval(&u) *= tens[j1 & 0xf];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2535 for(j = j1 >> 4; j; j >>= 1, i++)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2536 if (j & 1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2537 ieps++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2538 dval(&u) *= bigtens[i];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2539 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2540 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2541 if (k_check && dval(&u) < 1. && ilim > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2542 if (ilim1 <= 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2543 goto fast_failed;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2544 ilim = ilim1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2545 k--;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2546 dval(&u) *= 10.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2547 ieps++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2548 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2549 dval(&eps) = ieps*dval(&u) + 7.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2550 word0(&eps) -= (P-1)*Exp_msk1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2551 if (ilim == 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2552 S = mhi = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2553 dval(&u) -= 5.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2554 if (dval(&u) > dval(&eps))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2555 goto one_digit;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2556 if (dval(&u) < -dval(&eps))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2557 goto no_digits;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2558 goto fast_failed;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2559 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2560 if (leftright) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2561 /* Use Steele & White method of only
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2562 * generating digits needed.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2563 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2564 dval(&eps) = 0.5/tens[ilim-1] - dval(&eps);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2565 for(i = 0;;) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2566 L = (Long)dval(&u);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2567 dval(&u) -= L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2568 *s++ = '0' + (int)L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2569 if (dval(&u) < dval(&eps))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2570 goto ret1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2571 if (1. - dval(&u) < dval(&eps))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2572 goto bump_up;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2573 if (++i >= ilim)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2574 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2575 dval(&eps) *= 10.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2576 dval(&u) *= 10.;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2577 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2578 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2579 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2580 /* Generate ilim digits, then fix them up. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2581 dval(&eps) *= tens[ilim-1];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2582 for(i = 1;; i++, dval(&u) *= 10.) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2583 L = (Long)(dval(&u));
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2584 if (!(dval(&u) -= L))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2585 ilim = i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2586 *s++ = '0' + (int)L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2587 if (i == ilim) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2588 if (dval(&u) > 0.5 + dval(&eps))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2589 goto bump_up;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2590 else if (dval(&u) < 0.5 - dval(&eps)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2591 while(*--s == '0');
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2592 s++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2593 goto ret1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2594 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2595 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2596 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2597 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2598 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2599 fast_failed:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2600 s = s0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2601 dval(&u) = dval(&d2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2602 k = k0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2603 ilim = ilim0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2604 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2605
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2606 /* Do we have a "small" integer? */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2607
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2608 if (be >= 0 && k <= Int_max) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2609 /* Yes. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2610 ds = tens[k];
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2611 if (ndigits < 0 && ilim <= 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2612 S = mhi = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2613 if (ilim < 0 \|\| dval(&u) <= 5*ds)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2614 goto no_digits;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2615 goto one_digit;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2616 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2617 for(i = 1;; i++, dval(&u) *= 10.) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2618 L = (Long)(dval(&u) / ds);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2619 dval(&u) -= L*ds;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2620 *s++ = '0' + (int)L;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2621 if (!dval(&u)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2622 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2623 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2624 if (i == ilim) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2625 dval(&u) += dval(&u);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2626 if (dval(&u) > ds \|\| (dval(&u) == ds && L & 1)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2627 bump_up:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2628 while(*--s == '9')
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2629 if (s == s0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2630 k++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2631 *s = '0';
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2632 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2633 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2634 ++*s++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2635 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2636 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2637 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2638 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2639 goto ret1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2640 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2641
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2642 m2 = b2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2643 m5 = b5;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2644 if (leftright) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2645 i =
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2646 denorm ? be + (Bias + (P-1) - 1 + 1) :
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2647 1 + P - bbits;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2648 b2 += i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2649 s2 += i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2650 mhi = i2b(1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2651 if (mhi == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2652 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2653 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2654 if (m2 > 0 && s2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2655 i = m2 < s2 ? m2 : s2;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2656 b2 -= i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2657 m2 -= i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2658 s2 -= i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2659 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2660 if (b5 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2661 if (leftright) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2662 if (m5 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2663 mhi = pow5mult(mhi, m5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2664 if (mhi == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2665 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2666 b1 = mult(mhi, b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2667 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2668 b = b1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2669 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2670 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2671 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2672 if ((j = b5 - m5)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2673 b = pow5mult(b, j);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2674 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2675 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2676 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2677 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2678 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2679 b = pow5mult(b, b5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2680 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2681 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2682 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2683 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2684 S = i2b(1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2685 if (S == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2686 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2687 if (s5 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2688 S = pow5mult(S, s5);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2689 if (S == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2690 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2691 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2692
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2693 /* Check for special case that d is a normalized power of 2. */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2694
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2695 spec_case = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2696 if ((mode < 2 \|\| leftright)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2697 ) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2698 if (!word1(&u) && !(word0(&u) & Bndry_mask)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2699 && word0(&u) & (Exp_mask & ~Exp_msk1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2700 ) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2701 /* The special case */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2702 b2 += Log2P;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2703 s2 += Log2P;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2704 spec_case = 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2705 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2706 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2707
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2708 /* Arrange for convenient computation of quotients:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2709 * shift left if necessary so divisor has 4 leading 0 bits.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2710 *
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2711 * Perhaps we should just compute leading 28 bits of S once
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2712 * and for all and pass them and a shift to quorem, so it
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2713 * can do shifts and ors to compute the numerator for q.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2714 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2715 #define iInc 28
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2716 i = dshift(S, s2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2717 b2 += i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2718 m2 += i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2719 s2 += i;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2720 if (b2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2721 b = lshift(b, b2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2722 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2723 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2724 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2725 if (s2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2726 S = lshift(S, s2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2727 if (S == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2728 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2729 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2730 if (k_check) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2731 if (cmp(b,S) < 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2732 k--;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2733 b = multadd(b, 10, 0); /* we botched the k estimate */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2734 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2735 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2736 if (leftright) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2737 mhi = multadd(mhi, 10, 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2738 if (mhi == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2739 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2740 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2741 ilim = ilim1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2742 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2743 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2744 if (ilim <= 0 && (mode == 3 \|\| mode == 5)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2745 if (ilim < 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2746 /* no digits, fcvt style */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2747 no_digits:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2748 k = -1 - ndigits;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2749 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2750 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2751 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2752 S = multadd(S, 5, 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2753 if (S == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2754 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2755 if (cmp(b, S) <= 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2756 goto no_digits;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2757 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2758 one_digit:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2759 *s++ = '1';
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2760 k++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2761 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2762 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2763 if (leftright) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2764 if (m2 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2765 mhi = lshift(mhi, m2);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2766 if (mhi == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2767 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2768 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2769
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2770 /* Compute mlo -- check for special case
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2771 * that d is a normalized power of 2.
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2772 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2773
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2774 mlo = mhi;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2775 if (spec_case) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2776 mhi = Balloc(mhi->k);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2777 if (mhi == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2778 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2779 Bcopy(mhi, mlo);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2780 mhi = lshift(mhi, Log2P);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2781 if (mhi == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2782 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2783 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2784
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2785 for(i = 1;;i++) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2786 dig = quorem(b,S) + '0';
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2787 /* Do we yet have the shortest decimal string
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2788 * that will round to d?
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2789 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2790 j = cmp(b, mlo);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2791 delta = diff(S, mhi);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2792 if (delta == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2793 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2794 j1 = delta->sign ? 1 : cmp(b, delta);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2795 Bfree(delta);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2796 if (j1 == 0 && mode != 1 && !(word1(&u) & 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2797 ) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2798 if (dig == '9')
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2799 goto round_9_up;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2800 if (j > 0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2801 dig++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2802 *s++ = dig;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2803 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2804 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2805 if (j < 0 \|\| (j == 0 && mode != 1
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2806 && !(word1(&u) & 1)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2807 )) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2808 if (!b->x[0] && b->wds <= 1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2809 goto accept_dig;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2810 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2811 if (j1 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2812 b = lshift(b, 1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2813 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2814 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2815 j1 = cmp(b, S);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2816 if ((j1 > 0 \|\| (j1 == 0 && dig & 1))
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2817 && dig++ == '9')
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2818 goto round_9_up;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2819 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2820 accept_dig:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2821 *s++ = dig;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2822 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2823 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2824 if (j1 > 0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2825 if (dig == '9') { /* possible if i == 1 */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2826 round_9_up:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2827 *s++ = '9';
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2828 goto roundoff;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2829 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2830 *s++ = dig + 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2831 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2832 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2833 *s++ = dig;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2834 if (i == ilim)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2835 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2836 b = multadd(b, 10, 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2837 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2838 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2839 if (mlo == mhi) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2840 mlo = mhi = multadd(mhi, 10, 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2841 if (mlo == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2842 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2843 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2844 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2845 mlo = multadd(mlo, 10, 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2846 if (mlo == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2847 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2848 mhi = multadd(mhi, 10, 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2849 if (mhi == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2850 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2851 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2852 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2853 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2854 else
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2855 for(i = 1;; i++) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2856 *s++ = dig = quorem(b,S) + '0';
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2857 if (!b->x[0] && b->wds <= 1) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2858 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2859 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2860 if (i >= ilim)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2861 break;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2862 b = multadd(b, 10, 0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2863 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2864 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2865 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2866
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2867 /* Round off last digit */
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2868
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2869 b = lshift(b, 1);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2870 if (b == NULL)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2871 goto failed_malloc;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2872 j = cmp(b, S);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2873 if (j > 0 \|\| (j == 0 && dig & 1)) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2874 roundoff:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2875 while(*--s == '9')
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2876 if (s == s0) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2877 k++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2878 *s++ = '1';
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2879 goto ret;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2880 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2881 ++*s++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2882 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2883 else {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2884 while(*--s == '0');
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2885 s++;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2886 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2887 ret:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2888 Bfree(S);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2889 if (mhi) {
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2890 if (mlo && mlo != mhi)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2891 Bfree(mlo);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2892 Bfree(mhi);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2893 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2894 ret1:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2895 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2896 *s = 0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2897 *decpt = k + 1;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2898 if (rve)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2899 *rve = s;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2900 return s0;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2901 failed_malloc:
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2902 if (S)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2903 Bfree(S);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2904 if (mlo && mlo != mhi)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2905 Bfree(mlo);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2906 if (mhi)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2907 Bfree(mhi);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2908 if (b)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2909 Bfree(b);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2910 if (s0)
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2911 _Py_dg_freedtoa(s0);
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2912 return NULL;
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2913 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2914 #ifdef __cplusplus
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2915 }
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2916 #endif
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2917
2146bbdf4ed7 Issue #7117: Prepare for backport of py3k float repr. Mark Dickinson <dickinsm@gmail.com> parents: diff changeset	2918 #endif /* PY_NO_SHORT_FLOAT_REPR */

Mercurial > cpython-lru_cache-weakref

annotate Python/dtoa.c @ 80661:94de77bd0b4b 2.7