1 /* s_isnanf.c -- float version of s_isnan.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16 #include <sys/cdefs.h>
17 #if defined(LIBM_SCCS) && !defined(lint)
18 __RCSID("$NetBSD: s_isnanf.c,v 1.7 2002/05/26 22:01:56 wiz Exp $");
19 #endif
20
21 /*
22 * isnanf(x) returns 1 is x is nan, else 0;
23 * no branching!
24 */
25
26 #include "math.h"
27 #include "math_private.h"
28
29 int
isnanf(float x)30 isnanf(float x)
31 {
32 int32_t ix;
33 GET_FLOAT_WORD(ix,x);
34 ix &= 0x7fffffff;
35 ix = 0x7f800000 - ix;
36 return (int)(((u_int32_t)(ix))>>31);
37 }
38