/* @(#)s_isnan.c 5.1 93/09/24 */
/*
 * ====================================================
 * 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.
 * ====================================================
 */

/*
 * isnan(x) returns 1 is x is nan, else 0;
 * no branching!
 */

#include "math.h"
#include "math_private.h"

#undef __isnan
#ifdef __STDC__
	int __isnan(double x)
#else
	int __isnan(x)
	double x;
#endif
{
	int64_t hx;
	EXTRACT_WORDS64(hx,x);
	hx &= UINT64_C(0x7fffffffffffffff);
	hx = UINT64_C(0x7ff0000000000000) - hx;
	return (int)(((uint64_t)hx)>>63);
}
hidden_def (__isnan)
weak_alias (__isnan, isnan)
#ifdef NO_LONG_DOUBLE
strong_alias (__isnan, __isnanl)
weak_alias (__isnan, isnanl)
#endif
