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python

std-python

python3.8.10

Python

pymath.c

pymath.c 1.60 KB

#include "Python.h"

#ifdef X87_DOUBLE_ROUNDING
/* On x86 platforms using an x87 FPU, this function is called from the
 Py_FORCE_DOUBLE macro (defined in pymath.h) to force a floating-point
 number out of an 80-bit x87 FPU register and into a 64-bit memory location,
 thus rounding from extended precision to double precision. */
double _Py_force_double(double x)
{
 volatile double y;
 y = x;
 return y;
}
#endif

#ifdef HAVE_GCC_ASM_FOR_X87

/* inline assembly for getting and setting the 387 FPU control word on
 gcc/x86 */
#ifdef _Py_MEMORY_SANITIZER
__attribute__((no_sanitize_memory))
#endif
unsigned short _Py_get_387controlword(void) {
 unsigned short cw;
 __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
 return cw;
}

void _Py_set_387controlword(unsigned short cw) {
 __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
}

#endif

#ifndef HAVE_HYPOT
double hypot(double x, double y)
{
 double yx;

x = fabs(x);
 y = fabs(y);
 if (x < y) {
 double temp = x;
 x = y;
 y = temp;
 }
 if (x == 0.)
 return 0.;
 else {
 yx = y/x;
 return x*sqrt(1.+yx*yx);
 }
}
#endif /* HAVE_HYPOT */

#ifndef HAVE_COPYSIGN
double
copysign(double x, double y)
{
 /* use atan2 to distinguish -0. from 0. */
 if (y > 0. || (y == 0. && atan2(y, -1.) > 0.)) {
 return fabs(x);
 } else {
 return -fabs(x);
 }
}
#endif /* HAVE_COPYSIGN */

#ifndef HAVE_ROUND
double
round(double x)
{
 double absx, y;
 absx = fabs(x);
 y = floor(absx);
 if (absx - y >= 0.5)
 y += 1.0;
 return copysign(y, x);
}
#endif /* HAVE_ROUND */

一键复制编辑原始数据按行查看历史

bayanxing 提交于 2021年10月22日 16:55 +08:00 . python3.8 for openharmony l2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

#include "Python.h"

#ifdef X87_DOUBLE_ROUNDING
/* On x86 platforms using an x87 FPU, this function is called from the
 Py_FORCE_DOUBLE macro (defined in pymath.h) to force a floating-point
 number out of an 80-bit x87 FPU register and into a 64-bit memory location,
 thus rounding from extended precision to double precision. */
double _Py_force_double(double x)
{
 volatile double y;
 y = x;
 return y;
}
#endif

#ifdef HAVE_GCC_ASM_FOR_X87

/* inline assembly for getting and setting the 387 FPU control word on
 gcc/x86 */
#ifdef _Py_MEMORY_SANITIZER
__attribute__((no_sanitize_memory))
#endif
unsigned short _Py_get_387controlword(void) {
 unsigned short cw;
 __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
 return cw;
}

void _Py_set_387controlword(unsigned short cw) {
 __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
}

#endif


#ifndef HAVE_HYPOT
double hypot(double x, double y)
{
 double yx;

 x = fabs(x);
 y = fabs(y);
 if (x < y) {
 double temp = x;
 x = y;
 y = temp;
 }
 if (x == 0.)
 return 0.;
 else {
 yx = y/x;
 return x*sqrt(1.+yx*yx);
 }
}
#endif /* HAVE_HYPOT */

#ifndef HAVE_COPYSIGN
double
copysign(double x, double y)
{
 /* use atan2 to distinguish -0. from 0. */
 if (y > 0. || (y == 0. && atan2(y, -1.) > 0.)) {
 return fabs(x);
 } else {
 return -fabs(x);
 }
}
#endif /* HAVE_COPYSIGN */

#ifndef HAVE_ROUND
double
round(double x)
{
 double absx, y;
 absx = fabs(x);
 y = floor(absx);
 if (absx - y >= 0.5)
 y += 1.0;
 return copysign(y, x);
}
#endif /* HAVE_ROUND */