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_WORDS64(hx,x);
30 hx &= UINT64_C(0x7fffffffffffffff);
31 hx = UINT64_C(0x7ff0000000000000) - hx;
32 return (int)(((uint64_t)hx)>>63);
35 weak_alias (__isnan, isnan)
37 strong_alias (__isnan, __isnanl)
38 weak_alias (__isnan, isnanl)