1 /* Test for NaN that does not need libm. 2 Copyright (C) 2007-2021 Free Software Foundation, Inc. 3 4 This file is free software: you can redistribute it and/or modify 5 it under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 2.1 of the 7 License, or (at your option) any later version. 8 9 This file 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 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public License 15 along with this program. If not, see <https://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) || (__clang_major__ >= 4) 21 /* GCC >= 4.0 and clang provide a type-generic built-in for isnan. 22 GCC >= 4.0 also provides __builtin_isnanf, but clang doesn't. */ 23 # undef isnanf 24 # define isnanf(x) __builtin_isnan ((float)(x)) 25 # elif defined isnan 26 # undef isnanf 27 # define isnanf(x) isnan ((float)(x)) 28 # else 29 /* Get declaration of isnanf(), if not declared in <math.h>. */ 30 # if defined __sgi 31 /* We can't include <ieeefp.h>, because it conflicts with our definition of 32 isnand. Therefore declare isnanf separately. */ 33 extern int isnanf (float x); 34 # endif 35 # endif 36 #else 37 /* Test whether X is a NaN. */ 38 # undef isnanf 39 # define isnanf rpl_isnanf 40 extern int isnanf (float x); 41 #endif