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/* Return 1 if argument is a NaN, else 0.
Copyright (C) 2007-2024 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
<https://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
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