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 * ====================================================
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static char rcsid[] = "$NetBSD: s_isnan.c,v 1.8 1995/05/10 20:47:36 jtc Exp $";
18 * isnan(x) returns 1 is x is nan, else 0;
23 #include "math_private.h"
25 libm_hidden_proto (__isnan)
34 EXTRACT_WORDS(hx,lx,x);
36 hx |= (u_int32_t)(lx|(-lx))>>31;
38 return (int)(((u_int32_t)hx)>>31);
40 libm_hidden_def (__isnan)
41 weak_alias (__isnan, isnan)
43 strong_alias (__isnan, __isnanl)
44 weak_alias (__isnan, isnanl)