newlib-cygwin/newlib/libm/common/s_fpclassify.c

53 lines
1.3 KiB
C

/* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software
* is freely granted, provided that this notice is preserved.
*/
#include "fdlibm.h"
int
__fpclassifyf (float x)
{
unsigned int w;
GET_FLOAT_WORD(w,x);
if (w == 0x00000000 || w == 0x80000000)
return FP_ZERO;
else if ((w >= 0x00800000 && w <= 0x7f7fffff) ||
(w >= 0x80800000 && w <= 0xff7fffff))
return FP_NORMAL;
else if ((w >= 0x00000001 && w <= 0x007fffff) ||
(w >= 0x80000001 && w <= 0x807fffff))
return FP_SUBNORMAL;
else if (w == 0x7f800000 || w == 0xff800000)
return FP_INFINITE;
else
return FP_NAN;
}
int
__fpclassifyd (double x)
{
unsigned int msw, lsw;
EXTRACT_WORDS(msw,lsw,x);
if ((msw == 0x00000000 && lsw == 0x00000000) ||
(msw == 0x80000000 && lsw == 0x00000000))
return FP_ZERO;
else if ((msw >= 0x00100000 && msw <= 0x7fefffff) ||
(msw >= 0x80100000 && msw <= 0xffefffff))
return FP_NORMAL;
else if ((msw >= 0x00000000 && msw <= 0x000fffff) ||
(msw >= 0x80000000 && msw <= 0x800fffff))
/* zero is already handled above */
return FP_SUBNORMAL;
else if ((msw == 0x7ff00000 && lsw == 0x00000000) ||
(msw == 0xfff00000 && lsw == 0x00000000))
return FP_INFINITE;
else
return FP_NAN;
}