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>
29 EXTRACT_WORDS(hx
,lx
,x
);
31 hx
|= (u_int32_t
)(lx
|(-lx
))>>31;
33 return (int)(((u_int32_t
)hx
)>>31);
36 weak_alias (__isnan
, isnan
)
38 strong_alias (__isnan
, __isnanl
)
39 weak_alias (__isnan
, isnanl
)