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/* sf_c_isnan.c -- float version of s_c_isnan.c.
 */
 
/*
 * ====================================================
 * 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>.
 */
 
#include "fdlibm.h"
#include <ieeefp.h>
 
#undef isnanf
 
int
_DEFUN (isnanf, (x),
	float x)
{
	__int32_t ix;
	GET_FLOAT_WORD(ix,x);
	ix &= 0x7fffffff;
	return FLT_UWORD_IS_NAN(ix);
}
 
#ifdef _DOUBLE_IS_32BITS
 
#undef isnan
 
int
_DEFUN (isnan, (x),
	double x)
{
	return isnanf((float) x);
}
 
#endif /* defined(_DOUBLE_IS_32BITS) */