newlib-cygwin/newlib/libm/common/sf_isnan.c

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