/* Return 1 if argument is a NaN, else 0. Copyright (C) 2007-2013 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library. If not, see . */ /* Ugly kludge to avoid declarations. */ #define __isnanf not___isnanf #define isnanf not_isnanf #define __GI___isnanf not__GI___isnanf #include #include #undef __isnanf #undef isnanf #undef __GI___isnanf int __isnan (double x) { return isunordered (x, x); } hidden_def (__isnan) weak_alias (__isnan, isnan) /* It turns out that the 'double' version will also always work for single-precision. */ strong_alias (__isnan, __isnanf) weak_alias (__isnan, isnanf) /* ??? GCC 4.8 fails to look through chains of aliases with asm names attached. Work around this for now. */ hidden_ver (__isnan, __isnanf) #ifdef NO_LONG_DOUBLE strong_alias (__isnan, __isnanl) weak_alias (__isnan, isnanl) #endif #if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0) compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0); compat_symbol (libc, isnan, isnanl, GLIBC_2_0); #endif