49d1a4c562
also start prefering NtDll API. so far: * NtQueryInformationFile * NtClose adds a performance workaround for windows unicode conversion. but that should probably be removed before merging
35 lines
823 B
C
35 lines
823 B
C
/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the mingw-w64 runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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#define __CRT__NO_INLINE
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#include <math.h>
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/* 'fxam' sets FPU flags C3,C2,C0 'fstsw' stores:
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FP_NAN 001 0x0100
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FP_NORMAL 010 0x0400
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FP_INFINITE 011 0x0500
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FP_ZERO 100 0x4000
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FP_SUBNORMAL 110 0x4400
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and sets C1 flag (signbit) if neg */
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int __fpclassify (double _x)
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{
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__mingw_dbl_type_t hlp;
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unsigned int l, h;
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hlp.x = _x;
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h = hlp.lh.high;
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l = hlp.lh.low | (h & 0xfffff);
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h &= 0x7ff00000;
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if ((h | l) == 0)
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return FP_ZERO;
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if (!h)
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return FP_SUBNORMAL;
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if (h == 0x7ff00000)
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return (l ? FP_NAN : FP_INFINITE);
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return FP_NORMAL;
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}
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