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. */ 32extern 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 39extern int isnanf (float x); 40#endif 41