]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c
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"
25 EXTRACT_WORDS64(hx
,x
);
26 hx
&= UINT64_C(0x7fffffffffffffff);
27 hx
= UINT64_C(0x7ff0000000000000) - hx
;
28 return (int)(((uint64_t)hx
)>>63);
31 weak_alias (__isnan
, isnan
)
33 strong_alias (__isnan
, __isnanl
)
34 weak_alias (__isnan
, isnanl
)