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From: Ken Matsui <kmatsui@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r14-6626] libstdc++: Optimize std::is_member_pointer compilation performance Date: Sat, 16 Dec 2023 17:00:24 +0000 (GMT) [thread overview] Message-ID: <20231216170024.9D10D3870883@sourceware.org> (raw) https://gcc.gnu.org/g:d95e54347f84e16d09f89547f836d2a05c667c57 commit r14-6626-gd95e54347f84e16d09f89547f836d2a05c667c57 Author: Ken Matsui <kmatsui@gcc.gnu.org> Date: Mon Sep 11 20:35:53 2023 -0700 libstdc++: Optimize std::is_member_pointer compilation performance This patch optimizes the compilation performance of std::is_member_pointer by dispatching to the new __is_member_pointer built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_member_pointer): Use __is_member_pointer built-in trait. (is_member_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, 15 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 4a5068791af..4ab1d29ff51 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -716,6 +716,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct is_compound : public __not_<is_fundamental<_Tp>>::type { }; + /// is_member_pointer +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer) + template<typename _Tp> + struct is_member_pointer + : public __bool_constant<__is_member_pointer(_Tp)> + { }; +#else /// @cond undocumented template<typename _Tp> struct __is_member_pointer_helper @@ -726,11 +733,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION : public true_type { }; /// @endcond - /// is_member_pointer template<typename _Tp> struct is_member_pointer : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type { }; +#endif template<typename, typename> struct is_same; @@ -3228,8 +3235,15 @@ template <typename _Tp> inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; template <typename _Tp> inline constexpr bool is_compound_v = is_compound<_Tp>::value; + +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer) +template <typename _Tp> + inline constexpr bool is_member_pointer_v = __is_member_pointer(_Tp); +#else template <typename _Tp> inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; +#endif + template <typename _Tp> inline constexpr bool is_const_v = false; template <typename _Tp>
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