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) |
16 | static 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 |
28 | int __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 | } |
36 | hidden_def (__isnanf) |
37 | weak_alias (__isnanf, isnanf) |
38 | |