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

   Copyright (C) 2007-2018 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	not___isnanf

#define isnanf		not_isnanf

#define __GI___isnanf	not__GI___isnanf

#include <math.h>

#include <math_private.h>

#include <math_ldbl_opt.h>

#undef __isnanf

#undef isnanf

#undef __GI___isnanf

int

__isnan (double x)

{

  uint64_t ix;

  EXTRACT_WORDS64 (ix, x);

  return ix * 2 > 0xffe0000000000000ul;

}

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)

weak_alias (__isnan, isnanf)

/* ??? GCC 4.8 fails to look through chains of aliases with asm names

   attached.  Work around this for now.  */

hidden_ver (__isnan, __isnanf)

#ifdef NO_LONG_DOUBLE

strong_alias (__isnan, __isnanl)

weak_alias (__isnan, isnanl)

#endif

#if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)

compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);

compat_symbol (libc, isnan, isnanl, GLIBC_2_0);

#endif