| 1 | /* Test for NaN that does not need libm. |
| 2 | Copyright (C) 2007-2016 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 |