Mercurial > cpython-lru_cache-weakref

annotate Include/floatobject.h @ 45837:c5241069fffd legacy-trunk

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Speed up test_dict by about 10x by only checking selected dict literal sizes, instead of every integer from 0 to 400. Exhaustive testing wastes time without providing enough more assurance that the code is correct.
author Jeffrey Yasskin <jyasskin@gmail.com>
date Tue, 18 Mar 2008 05:12:41 +0000
parents 8fdd6d62ea55
children 5bc7b20dc04a
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2 /* Float object interface */
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3
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4 /*
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5 PyFloatObject represents a (double precision) floating point number.
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6 */
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8 #ifndef Py_FLOATOBJECT_H
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9 #define Py_FLOATOBJECT_H
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10 #ifdef __cplusplus
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11 extern "C" {
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12 #endif
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14 typedef struct {
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15 PyObject_HEAD
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16 double ob_fval;
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17 } PyFloatObject;
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19 PyAPI_DATA(PyTypeObject) PyFloat_Type;
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20
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21 #define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type)
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22 #define PyFloat_CheckExact(op) (Py_TYPE(op) == &PyFloat_Type)
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24 PyAPI_FUNC(double) PyFloat_GetMax(void);
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25 PyAPI_FUNC(double) PyFloat_GetMin(void);
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26 PyAPI_FUNC(PyObject *) PyFloat_GetInfo(void);
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27
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28 /* Return Python float from string PyObject. Second argument ignored on
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29 input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
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30 purpose once but can't be made to work as intended). */
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31 PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*, char** junk);
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32
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33 /* Return Python float from C double. */
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34 PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);
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36 /* Extract C double from Python float. The macro version trades safety for
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37 speed. */
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38 PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
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39 #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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41 /* Write repr(v) into the char buffer argument, followed by null byte. The
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42 buffer must be "big enough"; >= 100 is very safe.
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43 PyFloat_AsReprString(buf, x) strives to print enough digits so that
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44 PyFloat_FromString(buf) then reproduces x exactly. */
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45 PyAPI_FUNC(void) PyFloat_AsReprString(char*, PyFloatObject *v);
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47 /* Write str(v) into the char buffer argument, followed by null byte. The
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48 buffer must be "big enough"; >= 100 is very safe. Note that it's
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49 unusual to be able to get back the float you started with from
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50 PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
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51 preserve precision across conversions. */
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52 PyAPI_FUNC(void) PyFloat_AsString(char*, PyFloatObject *v);
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54 /* _PyFloat_{Pack,Unpack}{4,8}
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55 *
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56 * The struct and pickle (at least) modules need an efficient platform-
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57 * independent way to store floating-point values as byte strings.
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58 * The Pack routines produce a string from a C double, and the Unpack
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59 * routines produce a C double from such a string. The suffix (4 or 8)
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60 * specifies the number of bytes in the string.
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61 *
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62 * On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats
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63 * these functions work by copying bits. On other platforms, the formats the
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64 * 4- byte format is identical to the IEEE-754 single precision format, and
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65 * the 8-byte format to the IEEE-754 double precision format, although the
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66 * packing of INFs and NaNs (if such things exist on the platform) isn't
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67 * handled correctly, and attempting to unpack a string containing an IEEE
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68 * INF or NaN will raise an exception.
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69 *
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70 * On non-IEEE platforms with more precision, or larger dynamic range, than
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71 * 754 supports, not all values can be packed; on non-IEEE platforms with less
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72 * precision, or smaller dynamic range, not all values can be unpacked. What
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73 * happens in such cases is partly accidental (alas).
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74 */
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75
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76 /* The pack routines write 4 or 8 bytes, starting at p. le is a bool
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77 * argument, true if you want the string in little-endian format (exponent
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78 * last, at p+3 or p+7), false if you want big-endian format (exponent
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79 * first, at p).
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80 * Return value: 0 if all is OK, -1 if error (and an exception is
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81 * set, most likely OverflowError).
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82 * There are two problems on non-IEEE platforms:
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83 * 1): What this does is undefined if x is a NaN or infinity.
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84 * 2): -0.0 and +0.0 produce the same string.
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85 */
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86 PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);
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87 PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);
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88
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89 /* Used to get the important decimal digits of a double */
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90 PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum);
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91 PyAPI_FUNC(void) _PyFloat_DigitsInit(void);
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92
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93 /* The unpack routines read 4 or 8 bytes, starting at p. le is a bool
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94 * argument, true if the string is in little-endian format (exponent
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95 * last, at p+3 or p+7), false if big-endian (exponent first, at p).
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96 * Return value: The unpacked double. On error, this is -1.0 and
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97 * PyErr_Occurred() is true (and an exception is set, most likely
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98 * OverflowError). Note that on a non-IEEE platform this will refuse
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99 * to unpack a string that represents a NaN or infinity.
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100 */
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101 PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);
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102 PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);
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103
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104 /* free list api */
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105 PyAPI_FUNC(void) PyFloat_CompactFreeList(size_t *, size_t *, size_t *);
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106
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107 #ifdef __cplusplus
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108 }
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109 #endif
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110 #endif /* !Py_FLOATOBJECT_H */