| /* Return 1 if argument is a NaN, else 0. |
| Copyright (C) 1997, 2000, 2002, 2006 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| /* Ugly kludge to avoid declarations. */ |
| #define __isnanf __Xisnanf |
| #define isnanf Xisnanf |
| #define __GI___isnanf __GI___Xisnanf |
| |
| #include "math.h" |
| #include <math_ldbl_opt.h> |
| #include <fenv_libc.h> |
| |
| #undef __isnanf |
| #undef isnanf |
| #undef __GI___isnanf |
| |
| |
| /* The hidden_proto in include/math.h was obscured by the macro hackery. */ |
| __typeof (__isnan) __isnanf; |
| hidden_proto (__isnanf) |
| |
| |
| int |
| __isnan (x) |
| double x; |
| { |
| fenv_t savedstate; |
| int result; |
| savedstate = fegetenv_register (); |
| reset_fpscr_bit (FPSCR_VE); |
| result = !(x == x); |
| fesetenv_register (savedstate); |
| return result; |
| } |
| 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) |
| hidden_def (__isnanf) |
| weak_alias (__isnanf, isnanf) |
| |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__isnan, __isnanl) |
| weak_alias (__isnan, isnanl) |
| #endif |
