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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_ISNANF_IN_LIBC
18 /* Get declaration of isnan macro or (older) isnanf function.  */
19 # include <math.h>
20 # if __GNUC__ >= 4
21    /* GCC 4.0 and newer provides three built-ins for isnan.  */
22 #  undef isnanf
23 #  define isnanf(x) __builtin_isnanf ((float)(x))
24 # elif defined isnan
25 #  undef isnanf
26 #  define isnanf(x) isnan ((float)(x))
27 # else
28    /* Get declaration of isnanf(), if not declared in <math.h>.  */
29 #  if defined __sgi
30    /* We can't include <ieeefp.h>, because it conflicts with our definition of
31       isnand.  Therefore declare isnanf separately.  */
32 extern int isnanf (float x);
33 #  endif
34 # endif
35 #else
36 /* Test whether X is a NaN.  */
37 # undef isnanf
38 # define isnanf rpl_isnanf
39 extern int isnanf (float x);
40 #endif
41