kc3-lang/gnulib/lib/isnand.h

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• Hash : 3e4b5182
  Author :
  Date : 2008-01-26T15:37:59
  

  Make use of GCC's __builtin_isnan.
  

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• lib/isnand.h

• /* Test for NaN that does not need libm.
     Copyright (C) 2007-2008 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #if HAVE_ISNAND_IN_LIBC
  /* Get declaration of isnan macro.  */
  # include <math.h>
  # if __GNUC__ >= 4
     /* GCC 4.0 and newer provides three built-ins for isnan.  */
  #  undef isnand
  #  define isnand(x) __builtin_isnan ((double)(x))
  # else
  #  undef isnand
  #  define isnand(x) isnan ((double)(x))
  # endif
  #else
  /* Test whether X is a NaN.  */
  # undef isnand
  # define isnand rpl_isnand
  extern int isnand (double x);
  #endif
  

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