mirror of https://github.com/python/cpython
68 lines
1.2 KiB
C
68 lines
1.2 KiB
C
#include "Python.h"
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#ifdef HAVE_GCC_ASM_FOR_X87
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// Inline assembly for getting and setting the 387 FPU control word on
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// GCC/x86.
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#ifdef _Py_MEMORY_SANITIZER
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__attribute__((no_sanitize_memory))
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#endif
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unsigned short _Py_get_387controlword(void) {
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unsigned short cw;
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__asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
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return cw;
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}
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void _Py_set_387controlword(unsigned short cw) {
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__asm__ __volatile__ ("fldcw %0" : : "m" (cw));
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}
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#endif // HAVE_GCC_ASM_FOR_X87
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#ifndef HAVE_HYPOT
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double hypot(double x, double y)
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{
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double yx;
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x = fabs(x);
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y = fabs(y);
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if (x < y) {
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double temp = x;
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x = y;
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y = temp;
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}
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if (x == 0.)
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return 0.;
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else {
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yx = y/x;
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return x*sqrt(1.+yx*yx);
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}
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}
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#endif /* HAVE_HYPOT */
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#ifndef HAVE_COPYSIGN
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double
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copysign(double x, double y)
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{
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/* use atan2 to distinguish -0. from 0. */
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if (y > 0. || (y == 0. && atan2(y, -1.) > 0.)) {
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return fabs(x);
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} else {
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return -fabs(x);
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}
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}
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#endif /* HAVE_COPYSIGN */
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#ifndef HAVE_ROUND
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double
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round(double x)
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{
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double absx, y;
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absx = fabs(x);
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y = floor(absx);
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if (absx - y >= 0.5)
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y += 1.0;
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return copysign(y, x);
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}
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#endif /* HAVE_ROUND */
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