mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-30 19:53:46 +00:00
32 lines
897 B
C
32 lines
897 B
C
/* Copyright (C) 2002, 2007 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
|
|
__fpclassifyd (double x)
|
|
{
|
|
__uint32_t 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;
|
|
}
|