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 * ====================================================
12 * $FreeBSD: src/lib/msun/src/s_isnan.c,v 1.5 1999/08/28 00:06:50 peter Exp $
13 * $DragonFly: src/lib/msun/src/Attic/s_isnan.c,v 1.2 2003/06/17 04:26:53 dillon Exp $
17 * isnan(x) returns 1 is x is nan, else 0;
22 #include "math_private.h"
32 EXTRACT_WORDS(hx,lx,x);
34 hx |= (u_int32_t)(lx|(-lx))>>31;
36 return (int)((u_int32_t)(hx))>>31;