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/* Return 1 if argument is a NaN, else 0.
Copyright (C) 1997-2019 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
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