/* Return 1 if argument is a NaN, else 0.
   Copyright (C) 1997 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.
  
   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "math.h"
#include <fenv_libc.h>

int __isnan(double x)
{
  fenv_t savedstate;
  int result;
  savedstate = fegetenv_register();
  reset_fpscr_bit(FPSCR_VE);
  result = !(x == x);
  fesetenv_register(savedstate);
  return result;
}
weak_alias (__isnan, isnan)
/* It turns out that the 'double' version will also always work for
   single-precision.  Use explicit assembler to stop gcc complaining
   that 'isnanf' takes a float parameter, not double.  */
asm ("\
        .globl __isnanf
        .globl isnanf
        .weak isnanf
	.set __isnanf,__isnan
	.set isnanf,__isnan
");
#ifdef NO_LONG_DOUBLE
strong_alias (__isnan, __isnanl)
weak_alias (__isnan, isnanl)
#endif