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From: Ken Matsui <kmatsui@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r14-6627] libstdc++: Optimize std::is_member_function_pointer compilation performance Date: Sat, 16 Dec 2023 17:00:29 +0000 (GMT) [thread overview] Message-ID: <20231216170029.BC802384646A@sourceware.org> (raw) https://gcc.gnu.org/g:53f9d0cc07a0c85bf53541f79cc19730abcd17b9 commit r14-6627-g53f9d0cc07a0c85bf53541f79cc19730abcd17b9 Author: Ken Matsui <kmatsui@gcc.gnu.org> Date: Mon Sep 11 08:48:31 2023 -0700 libstdc++: Optimize std::is_member_function_pointer compilation performance This patch optimizes the compilation performance of std::is_member_function_pointer by dispatching to the new __is_member_function_pointer built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_member_function_pointer): Use __is_member_function_pointer built-in trait. (is_member_function_pointer_v): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Diff: --- libstdc++-v3/include/std/type_traits | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 4ab1d29ff51..99ae825301c 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -588,6 +588,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type { }; +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer) + /// is_member_function_pointer + template<typename _Tp> + struct is_member_function_pointer + : public __bool_constant<__is_member_function_pointer(_Tp)> + { }; +#else template<typename> struct __is_member_function_pointer_helper : public false_type { }; @@ -601,6 +608,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct is_member_function_pointer : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type { }; +#endif /// is_enum template<typename _Tp> @@ -3208,9 +3216,17 @@ template <typename _Tp> template <typename _Tp> inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<_Tp>::value; + +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer) +template <typename _Tp> + inline constexpr bool is_member_function_pointer_v = + __is_member_function_pointer(_Tp); +#else template <typename _Tp> inline constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value; +#endif + template <typename _Tp> inline constexpr bool is_enum_v = __is_enum(_Tp); template <typename _Tp>
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