forked from KolibriOS/kolibrios
32 lines
928 B
C
32 lines
928 B
C
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/* Copyright (C) 2002, 2007 by Red Hat, Incorporated. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software
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* is freely granted, provided that this notice is preserved.
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*/
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#include "fdlibm.h"
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int
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__fpclassifyd (double x)
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{
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__uint32_t msw, lsw;
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EXTRACT_WORDS(msw,lsw,x);
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if ((msw == 0x00000000 && lsw == 0x00000000) ||
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(msw == 0x80000000 && lsw == 0x00000000))
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return FP_ZERO;
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else if ((msw >= 0x00100000 && msw <= 0x7fefffff) ||
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(msw >= 0x80100000 && msw <= 0xffefffff))
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return FP_NORMAL;
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else if ((msw >= 0x00000000 && msw <= 0x000fffff) ||
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(msw >= 0x80000000 && msw <= 0x800fffff))
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/* zero is already handled above */
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return FP_SUBNORMAL;
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else if ((msw == 0x7ff00000 && lsw == 0x00000000) ||
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(msw == 0xfff00000 && lsw == 0x00000000))
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return FP_INFINITE;
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else
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return FP_NAN;
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}
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