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annotate Python/pymath.c @ 64209:dfd0229748ef 2.7

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Merged revisions 84239 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r84239 | antoine.pitrou | 2010-08-21 21:09:32 +0200 (sam., 21 août 2010) | 4 lines Issue #9617: Signals received during a low-level write operation aren't ignored by the buffered IO layer anymore. ........
author Antoine Pitrou <solipsis@pitrou.net>
date Sat, 21 Aug 2010 19:17:25 +0000
parents fd25030223b0
children b36cb4602e21
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1 #include "Python.h"
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2
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3 #ifdef X87_DOUBLE_ROUNDING
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4 /* On x86 platforms using an x87 FPU, this function is called from the
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5 Py_FORCE_DOUBLE macro (defined in pymath.h) to force a floating-point
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6 number out of an 80-bit x87 FPU register and into a 64-bit memory location,
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7 thus rounding from extended precision to double precision. */
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8 double _Py_force_double(double x)
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9 {
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10 volatile double y;
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11 y = x;
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12 return y;
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13 }
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14 #endif
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15
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16 #ifdef HAVE_GCC_ASM_FOR_X87
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17
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18 /* inline assembly for getting and setting the 387 FPU control word on
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19 gcc/x86 */
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20
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21 unsigned short _Py_get_387controlword(void) {
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22 unsigned short cw;
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23 __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
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24 return cw;
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25 }
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26
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27 void _Py_set_387controlword(unsigned short cw) {
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28 __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
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29 }
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30
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31 #endif
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32
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33
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34 #ifndef HAVE_HYPOT
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35 double hypot(double x, double y)
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36 {
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37 double yx;
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38
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39 x = fabs(x);
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40 y = fabs(y);
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41 if (x < y) {
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42 double temp = x;
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43 x = y;
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44 y = temp;
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45 }
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46 if (x == 0.)
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47 return 0.;
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48 else {
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49 yx = y/x;
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50 return x*sqrt(1.+yx*yx);
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51 }
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52 }
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53 #endif /* HAVE_HYPOT */
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54
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55 #ifndef HAVE_COPYSIGN
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56 double
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57 copysign(double x, double y)
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58 {
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59 /* use atan2 to distinguish -0. from 0. */
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60 if (y > 0. || (y == 0. && atan2(y, -1.) > 0.)) {
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61 return fabs(x);
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62 } else {
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63 return -fabs(x);
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64 }
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65 }
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66 #endif /* HAVE_COPYSIGN */
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67
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68 #ifndef HAVE_ROUND
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69 double
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70 round(double x)
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71 {
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72 double absx, y;
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73 absx = fabs(x);
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74 y = floor(absx);
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75 if (absx - y >= 0.5)
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76 y += 1.0;
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77 return copysign(y, x);
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78 }
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79 #endif /* HAVE_ROUND */