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From: Ken Matsui <kmatsui@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r14-6632] libstdc++: Optimize std::remove_pointer compilation performance Date: Sat, 16 Dec 2023 17:00:55 +0000 (GMT) [thread overview] Message-ID: <20231216170055.5864B38708D8@sourceware.org> (raw) https://gcc.gnu.org/g:61d6dee992fdfa350a0c6d2a8151ec6e2844c419 commit r14-6632-g61d6dee992fdfa350a0c6d2a8151ec6e2844c419 Author: Ken Matsui <kmatsui@gcc.gnu.org> Date: Mon Mar 20 14:05:48 2023 -0700 libstdc++: Optimize std::remove_pointer compilation performance This patch optimizes the compilation performance of std::remove_pointer by dispatching to the new remove_pointer built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (remove_pointer): Use __remove_pointer built-in trait. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Diff: --- libstdc++-v3/include/std/type_traits | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 2979d79a801..f00c07f94f9 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -2089,6 +2089,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION // Pointer modifications. + /// remove_pointer +#if _GLIBCXX_USE_BUILTIN_TRAIT(__remove_pointer) + template<typename _Tp> + struct remove_pointer + { using type = __remove_pointer(_Tp); }; +#else template<typename _Tp, typename> struct __remove_pointer_helper { using type = _Tp; }; @@ -2097,11 +2103,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct __remove_pointer_helper<_Tp, _Up*> { using type = _Up; }; - /// remove_pointer template<typename _Tp> struct remove_pointer : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>> { }; +#endif template<typename _Tp, typename = void> struct __add_pointer_helper
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