mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 05:40:06 +00:00
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/* Return 1 if argument is a NaN, else 0.
|
|
Copyright (C) 1997, 2000, 2002, 2006 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 (x)
|
|
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
|