mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/* Return 1 if argument is a NaN, else 0.
|
|
Copyright (C) 2007-2014 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_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
|