1/* s_isnanf.c -- float version of s_isnan.c.
2 */
3
4/*
5 * ====================================================
6 * Copyright (C) 1993, 2011 by Sun Microsystems, Inc. All rights reserved.
7 *
8 * Developed at SunPro, a Sun Microsystems, Inc. business.
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
11 * is preserved.
12 * ====================================================
13 */
14
15#if defined(LIBM_SCCS) && !defined(lint)
16static char rcsid[] = "$NetBSD: s_isnanf.c,v 1.4 1995/05/10 20:47:38 jtc Exp $";
17#endif
18
19/*
20 * isnanf(x) returns 1 is x is nan, else 0;
21 * no branching!
22 */
23
24#include <math.h>
25#include <math_private.h>
26
27#undef __isnanf
28int __isnanf(float x)
29{
30 int32_t ix;
31 GET_FLOAT_WORD(ix,x);
32 ix &= 0x7fffffff;
33 ix = 0x7f800000 - ix;
34 return (int)(((uint32_t)(ix))>>31);
35}
36hidden_def (__isnanf)
37weak_alias (__isnanf, isnanf)
38

source code of glibc/sysdeps/ieee754/flt-32/s_isnanf.c