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/* 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
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