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/* Macros for quiet not-a-number.
Copyright (C) 2007-2024 Free Software Foundation, Inc.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _GL_NAN_H
#define _GL_NAN_H
/* IBM z/OS supports both hexadecimal and IEEE floating-point formats. The
former does not support NaN and its isnan() implementation returns zero
for all values. */
#if defined __MVS__ && defined __IBMC__ && !defined __BFP__
# error "NaN is not supported with IBM's hexadecimal floating-point format; please re-compile with -qfloat=ieee"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* NaNf () returns a 'float' 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. The IBM XL C compiler on z/OS complains.
PGI 16.10 complains. clang 13 on mips64 does incorrect constant-folding. */
#if (defined __DECC || defined _MSC_VER \
|| (defined __MVS__ && defined __IBMC__) \
|| defined __PGI \
|| defined __mips__)
static float
NaNf ()
{
static float volatile zero = 0.0f;
return zero / zero;
}
#else
# define NaNf() (0.0f / 0.0f)
#endif
/* 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. The IBM XL C compiler on z/OS complains.
PGI 16.10 complains. clang 13 on mips64 does incorrect constant-folding. */
#if (defined __DECC || defined _MSC_VER \
|| (defined __MVS__ && defined __IBMC__) \
|| defined __PGI \
|| defined __mips__)
static double
NaNd ()
{
static double volatile zero = 0.0;
return zero / zero;
}
#else
# define NaNd() (0.0 / 0.0)
#endif
/* NaNl () returns a 'long double' not-a-number. */
/* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the
runtime type conversion.
The Microsoft MSVC 9 compiler chokes on the expression 0.0L / 0.0L.
The IBM XL C compiler on z/OS complains.
PGI 16.10 complains.
Avoid possible incorrect constant-folding on mips. */
#ifdef __sgi
static long double NaNl ()
{
double zero = 0.0;
return zero / zero;
}
#elif (defined _MSC_VER \
|| (defined __MVS__ && defined __IBMC__) \
|| defined __PGI \
|| defined __mips__)
static long double
NaNl ()
{
static long double volatile zero = 0.0L;
return zero / zero;
}
#else
# define NaNl() (0.0L / 0.0L)
#endif
#ifdef __cplusplus
}
#endif
#endif /* _GL_NAN_H */
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