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ef8566d72a
The macro __MATH_TG contains the logic to select between long double and
_Float128, when these types are ABI-distinct. This logic relies on
__builtin_types_compatible_p, which is not available in C++ mode.
On the other hand, C++ function overloading provides the means to
distinguish between the floating-point types. The overloading
resolution will match the correct parameter regardless of type
qualifiers, i.e.: const and volatile.
Tested for powerpc64le, s390x, and x86_64.
* math/math.h [defined __cplusplus] (issignaling): Provide a C++
definition for issignaling that does not rely on __MATH_TG,
since __MATH_TG uses __builtin_types_compatible_p, which is only
available in C mode.
(CFLAGS-test-math-issignaling.cc): New variable.
* math/Makefile [CXX] (tests): Add test-math-issignaling.
* math/test-math-issignaling.cc: New test for C++ implementation
of type-generic issignaling.
* sysdeps/powerpc/powerpc64le/Makefile [subdir == math]
(CXXFLAGS-test-math-issignaling.cc): Add -mfloat128 to the build
options of test-math-issignaling on powerpc64le.
(cherry picked from commit a16e8bc08e)
114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
/* Test for the C++ implementation of issignaling.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#define _GNU_SOURCE 1
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#include <math.h>
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#include <stdio.h>
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#include <limits>
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/* There is no signaling_NaN for _Float128 in std::numeric_limits.
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Include ieee754_float128.h and use the bitfields in the union
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ieee854_float128.ieee_nan to build a signaling NaN. */
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#if __HAVE_DISTINCT_FLOAT128
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# include <ieee754_float128.h>
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#endif
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static bool errors;
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static void
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check (int actual, int expected, const char *actual_expr, int line)
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{
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if (actual != expected)
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{
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errors = true;
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printf ("%s:%d: error: %s\n", __FILE__, line, actual_expr);
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printf ("%s:%d: expected: %d\n", __FILE__, line, expected);
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printf ("%s:%d: actual: %d\n", __FILE__, line, actual);
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}
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}
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#define CHECK(actual, expected) \
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check ((actual), (expected), #actual, __LINE__)
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template <class T>
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static void
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check_type ()
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{
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typedef std::numeric_limits<T> limits;
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CHECK (issignaling (T{0}), 0);
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if (limits::has_infinity)
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{
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CHECK (issignaling (limits::infinity ()), 0);
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CHECK (issignaling (-limits::infinity ()), 0);
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}
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if (limits::has_quiet_NaN)
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CHECK (issignaling (limits::quiet_NaN ()), 0);
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if (limits::has_signaling_NaN)
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CHECK (issignaling (limits::signaling_NaN ()), 1);
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}
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#if __HAVE_DISTINCT_FLOAT128
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static void
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check_float128 ()
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{
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ieee854_float128 q;
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q.d = 0;
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CHECK (issignaling (q.d), 0);
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/* Infinity. */
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q.ieee.negative = 0;
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q.ieee.exponent = 0x7FFF;
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q.ieee.mantissa0 = 0x0000;
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q.ieee.mantissa1 = 0x00000000;
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q.ieee.mantissa2 = 0x00000000;
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q.ieee.mantissa3 = 0x00000000;
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CHECK (issignaling (q.d), 0);
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/* Quiet NaN. */
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q.ieee_nan.quiet_nan = 1;
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q.ieee_nan.mantissa0 = 0x0000;
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CHECK (issignaling (q.d), 0);
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/* Still a quiet NaN. */
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q.ieee_nan.quiet_nan = 1;
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q.ieee_nan.mantissa0 = 0x4000;
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CHECK (issignaling (q.d), 0);
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/* Signaling NaN. */
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q.ieee_nan.quiet_nan = 0;
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q.ieee_nan.mantissa0 = 0x4000;
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CHECK (issignaling (q.d), 1);
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}
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#endif
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static int
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do_test (void)
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{
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check_type<float> ();
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check_type<double> ();
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check_type<long double> ();
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#if __HAVE_DISTINCT_FLOAT128
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check_float128 ();
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#endif
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return errors;
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}
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#include <support/test-driver.c>
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