1 /* @(#)s_isnan.c 5.1 93/09/24 */
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
10 * ====================================================
14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_isnan.c,v 1.5 1999/08/28 00:06:50 peter Exp $";
18 * isnan(x) returns 1 is x is nan, else 0;
23 #include "math_private.h"
33 EXTRACT_WORDS(hx,lx,x);
35 hx |= (u_int32_t)(lx|(-lx))>>31;
37 return (int)((u_int32_t)(hx))>>31;