1 | /* Test for NaN that does not need libm. |
2 | Copyright (C) 2007-2013 Free Software Foundation, Inc. |
3 | |
4 | This program is free software: you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 3 of the License, or |
7 | (at your option) any later version. |
8 | |
9 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU General Public License |
15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
16 | |
17 | #if HAVE_ISNANL_IN_LIBC |
18 | /* Get declaration of isnan macro or (older) isnanl function. */ |
19 | # include <math.h> |
20 | # if __GNUC__ >= 4 |
21 | /* GCC 4.0 and newer provides three built-ins for isnan. */ |
22 | # undef isnanl |
23 | # define isnanl(x) __builtin_isnanl ((long double)(x)) |
24 | # elif defined isnan |
25 | # undef isnanl |
26 | # define isnanl(x) isnan ((long double)(x)) |
27 | # endif |
28 | #else |
29 | /* Test whether X is a NaN. */ |
30 | # undef isnanl |
31 | # define isnanl rpl_isnanl |
32 | extern int isnanl (long double x); |
33 | #endif |
34 | |