mirror of
https://github.com/jart/cosmopolitan.git
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550b52abf6
- Introduce epoll_pwait() - Rewrite -ftrapv and ffs() libraries in C code - Use more FreeBSD code in math function library - Get significantly more tests passing on qemu-aarch64 - Fix many Musl long double functions that were broken on AARCH64
37 lines
1.7 KiB
C
37 lines
1.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=4 sts=4 sw=4 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Python 3 │
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│ https://docs.python.org/3/license.html │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/python/pyconfig.h"
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/* clang-format off */
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#ifdef X87_DOUBLE_ROUNDING
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/* On x86 platforms using an x87 FPU, this function is called from the
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Py_FORCE_DOUBLE macro (defined in pymath.h) to force a floating-point
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number out of an 80-bit x87 FPU register and into a 64-bit memory location,
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thus rounding from extended precision to double precision. */
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double _Py_force_double(double x)
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{
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volatile double y;
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y = x;
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return y;
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}
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#endif
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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
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