1/**
2 * This file has no copyright assigned and is placed in the Public Domain.
3 * This file is part of the mingw-w64 runtime package.
4 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
5 */
6#define __FP_SIGNBIT 0x0200
7int __signbit (double x);
8
9typedef union __mingw_dbl_type_t {
10 double x;
11 unsigned long long val;
12 __extension__ struct {
13 unsigned int low, high;
14 } lh;
15} __mingw_dbl_type_t;
16
17int __signbit (double x)
18{
19#if defined(__x86_64__) || defined(_AMD64_) || defined(__arm__) || defined(_ARM_) || defined(__aarch64__) || defined(_ARM64_)
20 __mingw_dbl_type_t hlp;
21
22 hlp.x = x;
23 return ((hlp.lh.high & 0x80000000) != 0);
24#elif defined(__i386__) || defined(_X86_)
25 unsigned short sw;
26 __asm__ __volatile__ ("fxam; fstsw %%ax;"
27 : "=a" (sw)
28 : "t" (x) );
29 return (sw & __FP_SIGNBIT) != 0;
30#endif
31}
32
33#undef signbit
34int __attribute__ ((alias ("__signbit"))) signbit (double);
35