sysdeps/m68k/s_isnanl.c

   1 /* Copyright (C) 1991, 1992, 1995, 1997, 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <math.h>
  20 #include "ieee754.h"
  21
  22 /* Return nonzero if VALUE is not a number.  */
  23 int
  24 __isnanl (long double value)
  25 {
  26   union ieee854_long_double u;
  27
  28   u.d = value;
  29
  30   /* IEEE 854 NaN's have the maximum possible
  31      exponent and a nonzero mantissa.  In Motorola's
  32      interpretation the integer bit is ignored.  */
  33   return ((u.ieee.exponent & 0x7fff) == 0x7fff &&
  34           ((u.ieee.mantissa0 & 0x7fffffff) != 0 || u.ieee.mantissa1 != 0));
  35 }
  36
  37 hidden_def (__isnanl)
  38 weak_alias (__isnanl, isnanl);