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, 2011 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 | #if defined(LIBM_SCCS) && !defined(lint) |
17 | static char rcsid[] = "$NetBSD: s_isnanf.c,v 1.4 1995/05/10 20:47:38 jtc Exp $" ; |
18 | #endif |
19 | |
20 | /* |
21 | * isnanf(x) returns 1 is x is nan, else 0; |
22 | * no branching! |
23 | */ |
24 | |
25 | #include <math.h> |
26 | #include <math_private.h> |
27 | |
28 | #undef __isnanf |
29 | int __isnanf(float x) |
30 | { |
31 | int32_t ix; |
32 | GET_FLOAT_WORD(ix,x); |
33 | ix &= 0x7fffffff; |
34 | ix = 0x7f800000 - ix; |
35 | return (int)(((uint32_t)(ix))>>31); |
36 | } |
37 | hidden_def (__isnanf) |
38 | weak_alias (__isnanf, isnanf) |
39 | |