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88b48903 WN |
1 | /* Test for NaN that does not need libm. |
2 | Copyright (C) 2007-2012 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_ISNAND_IN_LIBC | |
18 | /* Get declaration of isnan macro. */ | |
19 | # include <math.h> | |
20 | # if __GNUC__ >= 4 | |
21 | /* GCC 4.0 and newer provides three built-ins for isnan. */ | |
22 | # undef isnand | |
23 | # define isnand(x) __builtin_isnan ((double)(x)) | |
24 | # else | |
25 | # undef isnand | |
26 | # define isnand(x) isnan ((double)(x)) | |
27 | # endif | |
28 | #else | |
29 | /* Test whether X is a NaN. */ | |
30 | # undef isnand | |
31 | # define isnand rpl_isnand | |
32 | extern int isnand (double x); | |
33 | #endif |