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math: Define iszero as a function template for C++ [BZ #20715]

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This increases compatibility with C++ code which is forced to
compile with _GNU_SOURCE.
This commit is contained in:
Florian Weimer 2016-10-21 18:26:53 +02:00
parent 0f04fc07f6
commit b3918c44db
4 changed files with 116 additions and 6 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2016-10-21 Florian Weimer <fweimer@redhat.com>
[BZ #20715]
* math/math.h [__cplusplus] (iszero): Define as function template.
* math/Makefile [CXX] (tests): Add test-math-iszero.
(CFLAGS-test-math-iszero.cc): Set.
* math/test-math-iszero.cc: New file.
2016-10-20 Joseph Myers <joseph@codesourcery.com>
[BZ #20660]

3
math/Makefile
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@ -165,7 +165,7 @@ tests-static = test-fpucw-static test-fpucw-ieee-static \
test-signgam-ullong-static test-signgam-ullong-init-static
ifneq (,$(CXX))
tests += test-math-isinff
tests += test-math-isinff test-math-iszero
endif
ifneq (no,$(PERL))
@ -267,6 +267,7 @@ CFLAGS-test-signgam-ullong-static.c = -std=c99
CFLAGS-test-signgam-ullong-init-static.c = -std=c99
CFLAGS-test-math-isinff.cc = -std=gnu++11
CFLAGS-test-math-iszero.cc = -std=gnu++11
CFLAGS-test-iszero-excess-precision.c = -fexcess-precision=standard
CFLAGS-test-iseqsig-excess-precision.c = -fexcess-precision=standard

24
math/math.h
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@ -335,11 +335,25 @@ enum
# define issubnormal(x) (fpclassify (x) == FP_SUBNORMAL)
/* Return nonzero value if X is zero. */
# ifdef __SUPPORT_SNAN__
# define iszero(x) (fpclassify (x) == FP_ZERO)
# else
# define iszero(x) (((__typeof (x)) (x)) == 0)
# endif
# ifndef __cplusplus
# ifdef __SUPPORT_SNAN__
# define iszero(x) (fpclassify (x) == FP_ZERO)
# else
# define iszero(x) (((__typeof (x)) (x)) == 0)
# endif
# else /* __cplusplus */
__END_DECLS
template <class __T> inline bool
iszero (__T __val)
{
# ifdef __SUPPORT_SNAN__
return fpclassify (__val) == FP_ZERO;
# else
return __val == 0;
# endif
}
__BEGIN_DECLS
# endif /* __cplusplus */
#endif /* Use IEC_60559_BFP_EXT. */
#ifdef __USE_MISC

87
math/test-math-iszero.cc Normal file
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@ -0,0 +1,87 @@
/* Test for the C++ implementation of iszero.
Copyright (C) 2016 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/>. */
#define _GNU_SOURCE 1
#include <math.h>
#include <stdio.h>
#include <limits>
static bool errors;
static void
check (int actual, int expected, const char *actual_expr, int line)
{
if (actual != expected)
{
errors = true;
printf ("%s:%d: error: %s\n", __FILE__, line, actual_expr);
printf ("%s:%d: expected: %d\n", __FILE__, line, expected);
printf ("%s:%d: actual: %d\n", __FILE__, line, actual);
}
}
#define CHECK(actual, expected) \
check ((actual), (expected), #actual, __LINE__)
template <class T>
static void
check_type ()
{
typedef std::numeric_limits<T> limits;
CHECK (iszero (T{}), 1);
CHECK (iszero (T{0}), 1);
CHECK (iszero (T{-0.0}), 1);
CHECK (iszero (T{1}), 0);
CHECK (iszero (T{-1}), 0);
CHECK (iszero (limits::min ()), 0);
CHECK (iszero (-limits::min ()), 0);
CHECK (iszero (limits::max ()), 0);
CHECK (iszero (-limits::max ()), 0);
if (limits::has_infinity)
{
CHECK (iszero (limits::infinity ()), 0);
CHECK (iszero (-limits::infinity ()), 0);
}
CHECK (iszero (limits::epsilon ()), 0);
CHECK (iszero (-limits::epsilon ()), 0);
if (limits::has_quiet_NaN)
CHECK (iszero (limits::quiet_NaN ()), 0);
if (limits::has_signaling_NaN)
CHECK (iszero (limits::signaling_NaN ()), 0);
if (limits::has_signaling_NaN)
CHECK (iszero (limits::signaling_NaN ()), 0);
CHECK (iszero (limits::denorm_min ()),
std::numeric_limits<T>::has_denorm == std::denorm_absent);
CHECK (iszero (-limits::denorm_min ()),
std::numeric_limits<T>::has_denorm == std::denorm_absent);
}
static int
do_test (void)
{
check_type<float> ();
check_type<double> ();
#ifndef NO_LONG_DOUBLE
check_type<long double> ();
#endif
return errors;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"