/* @(#)s_finite.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.
 * ====================================================
 */

#ifndef lint
static char rcsid[] = "$Id: s_finite.c,v 1.4 1994/03/03 17:04:34 jtc Exp $";
#endif

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

#include <math.h>
#include <machine/endian.h>

#if BYTE_ORDER == LITTLE_ENDIAN
#define n0	1
#else
#define n0	0
#endif

#ifdef __STDC__
	int finite(double x)
#else
	int finite(x)
	double x;
#endif
{
	int hx; 
	hx = *(n0+(int*)&x);
	return  (unsigned)((hx&0x7fffffff)-0x7ff00000)>>31;
}