34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
/* Test for NaN that does not need libm.
|
|
Copyright (C) 2007-2012 Free Software Foundation, Inc.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#if HAVE_ISNANL_IN_LIBC
|
|
/* Get declaration of isnan macro or (older) isnanl function. */
|
|
# include <math.h>
|
|
# if __GNUC__ >= 4
|
|
/* GCC 4.0 and newer provides three built-ins for isnan. */
|
|
# undef isnanl
|
|
# define isnanl(x) __builtin_isnanl ((long double)(x))
|
|
# elif defined isnan
|
|
# undef isnanl
|
|
# define isnanl(x) isnan ((long double)(x))
|
|
# endif
|
|
#else
|
|
/* Test whether X is a NaN. */
|
|
# undef isnanl
|
|
# define isnanl rpl_isnanl
|
|
extern int isnanl (long double x);
|
|
#endif
|