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
34