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0413b54c UD |
1 | /* Return 1 if argument is a NaN, else 0. |
2 | Copyright (C) 1997 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "math.h" | |
21 | #include <fenv_libc.h> | |
22 | ||
23 | int __isnan(double x) | |
24 | { | |
25 | fenv_t savedstate; | |
26 | int result; | |
27 | savedstate = fegetenv_register(); | |
28 | reset_fpscr_bit(FPSCR_VE); | |
29 | result = !(x == x); | |
30 | fesetenv_register(savedstate); | |
31 | return result; | |
32 | } | |
33 | weak_alias (__isnan, isnan) | |
34 | /* It turns out that the 'double' version will also always work for | |
35 | single-precision. Use explicit assembler to stop gcc complaining | |
36 | that 'isnanf' takes a float parameter, not double. */ | |
37 | asm ("\ | |
38 | .globl __isnanf | |
39 | .globl isnanf | |
40 | .weak isnanf | |
41 | .set __isnanf,__isnan | |
42 | .set isnanf,__isnan | |
43 | "); | |
44 | #ifdef NO_LONG_DOUBLE | |
45 | strong_alias (__isnan, __isnanl) | |
46 | weak_alias (__isnan, isnanl) | |
47 | #endif |