File: isnand-nolibm.h

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/* Test for NaN that does not need libm.
   Copyright (C) 2007-2018 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   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 <https://www.gnu.org/licenses/>.  */

#if HAVE_ISNAND_IN_LIBC
/* Get declaration of isnan macro.  */
# include <math.h>
# if __GNUC__ >= 4
   /* GCC 4.0 and newer provides three built-ins for isnan.  */
#  undef isnand
#  define isnand(x) __builtin_isnan ((double)(x))
# else
#  undef isnand
#  define isnand(x) isnan ((double)(x))
# endif
#else
/* Test whether X is a NaN.  */
# undef isnand
# define isnand rpl_isnand
extern int isnand (double x);
#endif