sysdeps/alpha/fpu/s_isnan.c

   1 /* Return 1 if argument is a NaN, else 0.
   2    Copyright (C) 2007 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* Ugly kludge to avoid declarations.  */
  21 #define __isnanf        not___isnanf
  22 #define isnanf          not_isnanf
  23 #define __GI___isnanf   not__GI___isnanf
  24
  25 #include <math.h>
  26 #include <math_ldbl_opt.h>
  27
  28 #undef __isnanf
  29 #undef isnanf
  30 #undef __GI___isnanf
  31
  32 /* The hidden_proto in include/math.h was obscured by the macro hackery.  */
  33 __typeof (__isnan) __isnanf;
  34 hidden_proto (__isnanf)
  35
  36
  37 int
  38 __isnan (double x)
  39 {
  40   return isunordered (x, x);
  41 }
  42
  43 hidden_def (__isnan)
  44 weak_alias (__isnan, isnan)
  45
  46 /* It turns out that the 'double' version will also always work for
  47    single-precision.  */
  48 strong_alias (__isnan, __isnanf)
  49 hidden_def (__isnanf)
  50 weak_alias (__isnanf, isnanf)
  51
  52 #ifdef NO_LONG_DOUBLE
  53 strong_alias (__isnan, __isnanl)
  54 weak_alias (__isnan, isnanl)
  55 #endif
  56 #if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  57 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
  58 compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
  59 #endif