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