/* Return 1 if argument is a NaN, else 0.

   Copyright (C) 1997-2018 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 Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* Ugly kludge to avoid declarations.  */

#define __isnanf __Xisnanf

#define isnanf Xisnanf

#define __GI___isnanf __GI___Xisnanf

#include <math.h>

#include <math_ldbl_opt.h>

#include <fenv_libc.h>

#undef __isnanf

#undef isnanf

#undef __GI___isnanf

/* The hidden_proto in include/math.h was obscured by the macro hackery.  */

__typeof (__isnan) __isnanf;

hidden_proto (__isnanf)

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;

}

hidden_def (__isnan)

weak_alias (__isnan, isnan)

/* It turns out that the 'double' version will also always work for

   single-precision.  */

strong_alias (__isnan, __isnanf)

hidden_def (__isnanf)

weak_alias (__isnanf, isnanf)

#ifdef NO_LONG_DOUBLE

strong_alias (__isnan, __isnanl)

weak_alias (__isnan, isnanl)

#endif