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/* NaNs and Infinity in floating-point numbers.
Copyright (C) 2015-2023 Free Software Foundation, Inc.
This file was written by Daiki Ueno <ueno@gnu.org>, 2015.
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/>. */
/* Replacement 'trionan.c', using Gnulib functions. */
#include "config.h"
#include <float.h>
#include <math.h>
/* Copied from gnulib/tests/infinity.h. */
/* Infinityd () returns a 'double' +Infinity. */
/* The Microsoft MSVC 9 compiler chokes on the expression 1.0 / 0.0. */
#if defined _MSC_VER
static double
Infinityd ()
{
static double zero = 0.0;
return 1.0 / zero;
}
#else
# define Infinityd() (1.0 / 0.0)
#endif
/* Copied from gnulib/tests/nan.h. */
/* NaNd () returns a 'double' not-a-number. */
/* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
on the expression 0.0 / 0.0. */
#if defined __DECC || defined _MSC_VER
static double
NaNd ()
{
static double zero = 0.0;
return zero / zero;
}
#else
# define NaNd() (0.0 / 0.0)
#endif
/* Copied from gnulib/tests/minus-zero.h. */
/* minus_zerod represents the value -0.0. */
/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
ICC 10.0 has a bug when optimizing the expression -zero.
The expression -DBL_MIN * DBL_MIN does not work when cross-compiling
to PowerPC on Mac OS X 10.5. */
#if defined __hpux || defined __sgi || defined __ICC
_GL_ATTRIBUTE_MAYBE_UNUSED
static double
compute_minus_zerod (void)
{
return -DBL_MIN * DBL_MIN;
}
# define minus_zerod compute_minus_zerod ()
#else
_GL_ATTRIBUTE_MAYBE_UNUSED
static double minus_zerod = -0.0;
#endif
#undef INFINITY
#undef NAN
#define INFINITY Infinityd()
#define NAN NaNd()
#define trio_pinf() INFINITY
#define trio_ninf() -INFINITY
#define trio_nan() NAN
#define trio_nzero() minus_zerod
#define trio_isnan(x) isnan(x)
#define trio_isinf(x) isinf(x)
#define trio_signbit(x) signbit(x)
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