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/* Macros for quiet not-a-number.
Copyright (C) 2023-2024 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _SIGNED_NAN_H
#define _SIGNED_NAN_H
#include <math.h>
#include "nan.h"
/* Returns a quiet 'float' NaN with sign bit == 0. */
_GL_UNUSED static float
positive_NaNf ()
{
/* 'volatile' works around a GCC bug:
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655> */
float volatile nan = NaNf ();
return (signbit (nan) ? - nan : nan);
}
/* Returns a quiet 'float' NaN with sign bit == 1. */
_GL_UNUSED static float
negative_NaNf ()
{
/* 'volatile' works around a GCC bug:
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655> */
float volatile nan = NaNf ();
return (signbit (nan) ? nan : - nan);
}
/* Returns a quiet 'double' NaN with sign bit == 0. */
_GL_UNUSED static double
positive_NaNd ()
{
/* 'volatile' works around a GCC bug:
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655> */
double volatile nan = NaNd ();
return (signbit (nan) ? - nan : nan);
}
/* Returns a quiet 'double' NaN with sign bit == 1. */
_GL_UNUSED static double
negative_NaNd ()
{
/* 'volatile' works around a GCC bug:
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655> */
double volatile nan = NaNd ();
return (signbit (nan) ? nan : - nan);
}
/* Returns a quiet 'long double' NaN with sign bit == 0. */
_GL_UNUSED static long double
positive_NaNl ()
{
/* 'volatile' works around a GCC bug:
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655> */
long double volatile nan = NaNl ();
return (signbit (nan) ? - nan : nan);
}
/* Returns a quiet 'long double' NaN with sign bit == 1. */
_GL_UNUSED static long double
negative_NaNl ()
{
/* 'volatile' works around a GCC bug:
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655> */
long double volatile nan = NaNl ();
return (signbit (nan) ? nan : - nan);
}
#endif /* _SIGNED_NAN_H */
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