42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
/* Test for NaN that does not need libm.
|
|
Copyright (C) 2007-2021 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 <https://www.gnu.org/licenses/>. */
|
|
|
|
#if HAVE_ISNANF_IN_LIBC
|
|
/* Get declaration of isnan macro or (older) isnanf function. */
|
|
# include <math.h>
|
|
# if (__GNUC__ >= 4) || (__clang_major__ >= 4)
|
|
/* GCC >= 4.0 and clang provide a type-generic built-in for isnan.
|
|
GCC >= 4.0 also provides __builtin_isnanf, but clang doesn't. */
|
|
# undef isnanf
|
|
# define isnanf(x) __builtin_isnan ((float)(x))
|
|
# elif defined isnan
|
|
# undef isnanf
|
|
# define isnanf(x) isnan ((float)(x))
|
|
# else
|
|
/* Get declaration of isnanf(), if not declared in <math.h>. */
|
|
# if defined __sgi
|
|
/* We can't include <ieeefp.h>, because it conflicts with our definition of
|
|
isnand. Therefore declare isnanf separately. */
|
|
extern int isnanf (float x);
|
|
# endif
|
|
# endif
|
|
#else
|
|
/* Test whether X is a NaN. */
|
|
# undef isnanf
|
|
# define isnanf rpl_isnanf
|
|
extern int isnanf (float x);
|
|
#endif
|