Source code of Windows XP (NT5)
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/* _LDtest function -- IEEE 754 version */#include "xmath.h"
_STD_BEGIN
#if _DLONG == 0
_CRTIMP2 short __cdecl _LDtest(long double *px) { /* categorize *px -- 64-bit */ return (_Dtest((double *)px)); }
#elif _DLONG == 1
_CRTIMP2 short __cdecl _LDtest(long double *px) { /* categorize *px -- 80-bit */ unsigned short *ps = (unsigned short *)px; short xchar = ps[_L0] & _LMASK;
if (xchar == _LMAX) return ((ps[_L1] & 0x7fff) != 0 || ps[_L2] != 0 || ps[_L3] != 0 || ps[_L4] != 0 ? _NANCODE : _INFCODE); else if (0 < xchar || ps[_L1] != 0 || ps[_L2] || ps[_L3] || ps[_L4]) return (_FINITE); else return (0); }
#else /* 1 < _DLONG */
_CRTIMP2 short __cdecl _LDtest(long double *px) { /* categorize *px -- 128-bit SPARC */ unsigned short *ps = (unsigned short *)px; short xchar = ps[_L0] & _LMASK;
if (xchar == _LMAX) return (ps[_L1] != 0 || ps[_L2] != 0 || ps[_L3] != 0 || ps[_L4] != 0 || ps[_L5] != 0 || ps[_L6] != 0 || ps[_L7] != 0 ? _NANCODE : _INFCODE); else if (0 < xchar || ps[_L1] || ps[_L2] || ps[_L3] || ps[_L4] || ps[_L5] || ps[_L6] || ps[_L7]) return (_FINITE); else return (0); } #endif
_STD_END
/*
* Copyright (c) 1992-2001 by P.J. Plauger. ALL RIGHTS RESERVED. * Consult your license regarding permissions and restrictions. V3.10:0009 */
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