Provide a C++ version of iseqsig (bug 22377)
In C++ mode, __MATH_TG cannot be used for defining iseqsig, because __MATH_TG relies on __builtin_types_compatible_p, which is a C-only builtin. This is true when float128 is provided as an ABI-distinct type from long double. Moreover, the comparison macros from ISO C take two floating-point arguments, which need not have the same type. Choosing what underlying function to call requires evaluating the formats of the arguments, then selecting which is wider. The macro __MATH_EVAL_FMT2 provides this information, however, only the type of the macro expansion is relevant (actually evaluating the expression would be incorrect). This patch provides a C++ version of iseqsig, in which only the type of __MATH_EVAL_FMT2 (__typeof or decltype) is used as a template parameter for __iseqsig_type. This function calls the appropriate underlying function. Tested for powerpc64le and x86_64. [BZ #22377] * math/Makefile [C++] (tests): Add test for iseqsig. * math/math.h [C++] (iseqsig): New implementation, which does not rely on __MATH_TG/__builtin_types_compatible_p. * math/test-math-iseqsig.cc: New file. * sysdeps/powerpc/powerpc64le/Makefile (CFLAGS-test-math-iseqsig.cc): New variable.
This commit is contained in:
Gabriel F. T. Gomes
parent
10e93d9687
commit
c85e54ac6c
10
ChangeLog
10
ChangeLog
@ -1,3 +1,13 @@
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2017-12-19 Gabriel F. T. Gomes <gabriel@inconstante.eti.br>
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[BZ #22377]
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* math/Makefile [C++] (tests): Add test for iseqsig.
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* math/math.h [C++] (iseqsig): New implementation, which does
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not rely on __MATH_TG/__builtin_types_compatible_p.
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* math/test-math-iseqsig.cc: New file.
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* sysdeps/powerpc/powerpc64le/Makefile
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(CFLAGS-test-math-iseqsig.cc): New variable.
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2017-12-19 Dmitry V. Levin <ldv@altlinux.org>
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* elf/dl-load.c (is_trusted_path): Remove.
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@ -220,7 +220,7 @@ tests-static += atest-exp atest-sincos atest-exp2
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ifneq (,$(CXX))
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tests += test-math-isinff test-math-iszero test-math-issignaling \
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test-math-iscanonical test-math-cxx11
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test-math-iscanonical test-math-cxx11 test-math-iseqsig
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endif
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ifneq (no,$(PERL))
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72
math/math.h
72
math/math.h
@ -1182,8 +1182,76 @@ iszero (__T __val)
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/* Return X == Y but raising "invalid" and setting errno if X or Y is
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a NaN. */
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# define iseqsig(x, y) \
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__MATH_TG (__MATH_EVAL_FMT2 (x, y), __iseqsig, ((x), (y)))
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# if !defined __cplusplus || (__cplusplus < 201103L && !defined __GNUC__)
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# define iseqsig(x, y) \
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__MATH_TG (__MATH_EVAL_FMT2 (x, y), __iseqsig, ((x), (y)))
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# else
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/* In C++ mode, __MATH_TG cannot be used, because it relies on
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__builtin_types_compatible_p, which is a C-only builtin. Moreover,
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the comparison macros from ISO C take two floating-point arguments,
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which need not have the same type. Choosing what underlying function
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to call requires evaluating the formats of the arguments, then
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selecting which is wider. The macro __MATH_EVAL_FMT2 provides this
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information, however, only the type of the macro expansion is
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relevant (actually evaluating the expression would be incorrect).
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Thus, the type is used as a template parameter for __iseqsig_type,
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which calls the appropriate underlying function. */
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extern "C++" {
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template<typename> struct __iseqsig_type;
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template<> struct __iseqsig_type<float>
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{
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static int __call (float __x, float __y) throw ()
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{
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return __iseqsigf (__x, __y);
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}
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};
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template<> struct __iseqsig_type<double>
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{
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static int __call (double __x, double __y) throw ()
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{
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return __iseqsig (__x, __y);
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}
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};
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template<> struct __iseqsig_type<long double>
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{
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static int __call (double __x, double __y) throw ()
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{
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# ifndef __NO_LONG_DOUBLE_MATH
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return __iseqsigl (__x, __y);
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# else
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return __iseqsig (__x, __y);
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# endif
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}
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};
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# if __HAVE_DISTINCT_FLOAT128
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template<> struct __iseqsig_type<_Float128>
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{
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static int __call (_Float128 __x, _Float128 __y) throw ()
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{
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return __iseqsigf128 (__x, __y);
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}
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};
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# endif
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template<typename _T1, typename _T2>
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inline int
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iseqsig (_T1 __x, _T2 __y) throw ()
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{
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# if __cplusplus >= 201103L
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typedef decltype (__MATH_EVAL_FMT2 (__x, __y)) _T3;
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# else
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typedef __typeof (__MATH_EVAL_FMT2 (__x, __y)) _T3;
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# endif
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return __iseqsig_type<_T3>::__call (__x, __y);
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}
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} /* extern "C++" */
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# endif /* __cplusplus */
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#endif
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__END_DECLS
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111
math/test-math-iseqsig.cc
Normal file
111
math/test-math-iseqsig.cc
Normal file
@ -0,0 +1,111 @@
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/* Test for the C++ implementation of iseqsig.
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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 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 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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#include <support/check.h>
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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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support_record_failure ();
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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 T1, class T2>
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static void
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check_type ()
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{
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T1 t1 = 0;
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T2 t2 = 0;
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CHECK (iseqsig (t1, t2), 1);
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t2 = 1;
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CHECK (iseqsig (t1, t2), 0);
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if (std::numeric_limits<T1>::has_quiet_NaN
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&& std::numeric_limits<T2>::has_quiet_NaN)
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{
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CHECK (iseqsig (std::numeric_limits<T1>::quiet_NaN (), t2), 0);
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CHECK (iseqsig (t1, std::numeric_limits<T2>::quiet_NaN ()), 0);
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CHECK (iseqsig (std::numeric_limits<T1>::quiet_NaN (),
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std::numeric_limits<T2>::quiet_NaN ()), 0);
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}
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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 q1, q2, q3_nan;
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q1.d = 0;
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q2.d = 1;
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q3_nan.ieee_nan.negative = 0;
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q3_nan.ieee_nan.exponent = 0x7FFF;
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q3_nan.ieee_nan.quiet_nan = 1;
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q3_nan.ieee_nan.mantissa0 = 0x0000;
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q3_nan.ieee_nan.mantissa1 = 0x00000000;
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q3_nan.ieee_nan.mantissa2 = 0x00000000;
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q3_nan.ieee_nan.mantissa3 = 0x00000000;
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CHECK (iseqsig (q1.d, q1.d), 1);
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CHECK (iseqsig (q1.d, q2.d), 0);
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CHECK (iseqsig (q1.d, q3_nan.d), 0);
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CHECK (iseqsig (q3_nan.d, q3_nan.d), 0);
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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, float> ();
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check_type<float, double> ();
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check_type<float, long double> ();
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check_type<double, float> ();
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check_type<double, double> ();
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check_type<double, long double> ();
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check_type<long double, float> ();
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check_type<long double, double> ();
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check_type<long double, 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 0;
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}
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#include <support/test-driver.c>
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@ -20,10 +20,14 @@ $(foreach suf,$(all-object-suffixes),$(objpfx)test-ifloat64x%$(suf)): CFLAGS +=
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CFLAGS-libm-test-support-float128.c += -mfloat128
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CFLAGS-libm-test-support-float64x.c += -mfloat128
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CFLAGS-test-math-iscanonical.cc += -mfloat128
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CFLAGS-test-math-iseqsig.cc += -mfloat128
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CFLAGS-test-math-issignaling.cc += -mfloat128
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CFLAGS-test-math-iszero.cc += -mfloat128
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$(objpfx)test-float128% $(objpfx)test-ifloat128% \
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$(objpfx)test-float64x% $(objpfx)test-ifloat64x% $(objpfx)test-math-iszero: \
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$(foreach test, \
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test-float128% test-ifloat128% test-float64x% test-ifloat64x% \
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test-math-iscanonical test-math-iseqsig test-math-issignaling \
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test-math-iszero, \
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$(objpfx)$(test)): \
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gnulib-tests += $(f128-loader-link)
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endif
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