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46 lines
842 B
C
46 lines
842 B
C
/* sf_c_isnan.c -- float version of s_c_isnan.c.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* isnanf(x) returns 1 is x is nan, else 0;
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*
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* isnanf is an extension declared in <math.h>.
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*/
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#include "fdlibm.h"
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#include <ieeefp.h>
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#undef isnanf
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int
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isnanf (float x)
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{
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__int32_t ix;
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GET_FLOAT_WORD(ix,x);
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ix &= 0x7fffffff;
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return FLT_UWORD_IS_NAN(ix);
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}
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#ifdef _DOUBLE_IS_32BITS
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#undef isnan
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int
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isnan (double x)
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{
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return isnanf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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