| /* Test for NaN that does not need libm. |
| Copyright (C) 2007-2019 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General PublicLicense as published by |
| the Free Software Foundation; either version 2.1 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 Lesser General PublicLicense for more details. |
| |
| You should have received a copy of the GNU Lesser General PublicLicense |
| 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 |
| /* GCC 4.0 and newer provides three built-ins for isnan. */ |
| # undef isnanf |
| # define isnanf(x) __builtin_isnanf ((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 |
