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 * isnan(x) returns 1 is x is nan, else 0;
19 #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);
35 libm_hidden_def(__isnan)
36 weak_alias(__isnan,isnan)
37 libm_hidden_weak(isnan)