blob: f7303ec78d3285fe70d5c85c2456334ceaf62a04 [file] [log] [blame]
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
#define __CRT__NO_INLINE
#include <math.h>
/* 'fxam' sets FPU flags C3,C2,C0 'fstsw' stores:
FP_NAN 001 0x0100
FP_NORMAL 010 0x0400
FP_INFINITE 011 0x0500
FP_ZERO 100 0x4000
FP_SUBNORMAL 110 0x4400
and sets C1 flag (signbit) if neg */
int __fpclassify (double _x)
__mingw_dbl_type_t hlp;
unsigned int l, h;
hlp.x = _x;
h = hlp.lh.high;
l = hlp.lh.low | (h & 0xfffff);
h &= 0x7ff00000;
if ((h | l) == 0)
return FP_ZERO;
if (!h)
if (h == 0x7ff00000)
return (l ? FP_NAN : FP_INFINITE);
return FP_NORMAL;