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* [gcc r14-6628] libstdc++: Optimize std::is_member_object_pointer compilation performance
@ 2023-12-16 17:00 Ken Matsui
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From: Ken Matsui @ 2023-12-16 17:00 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:fa454b8dd0346a1821338e2cfcf27c9cff0f1b5c
commit r14-6628-gfa454b8dd0346a1821338e2cfcf27c9cff0f1b5c
Author: Ken Matsui <kmatsui@gcc.gnu.org>
Date: Tue Sep 12 00:14:06 2023 -0700
libstdc++: Optimize std::is_member_object_pointer compilation performance
This patch optimizes the compilation performance of
std::is_member_object_pointer by dispatching to the new
__is_member_object_pointer built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_member_object_pointer): Use
__is_member_object_pointer built-in trait.
(is_member_object_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 | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 99ae825301c..1edd05acb4c 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -574,6 +574,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct is_rvalue_reference<_Tp&&>
: public true_type { };
+ /// is_member_object_pointer
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_object_pointer)
+ template<typename _Tp>
+ struct is_member_object_pointer
+ : public __bool_constant<__is_member_object_pointer(_Tp)>
+ { };
+#else
template<typename>
struct __is_member_object_pointer_helper
: public false_type { };
@@ -582,11 +589,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __is_member_object_pointer_helper<_Tp _Cp::*>
: public __not_<is_function<_Tp>>::type { };
- /// is_member_object_pointer
+
template<typename _Tp>
struct is_member_object_pointer
: public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
+#endif
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer)
/// is_member_function_pointer
@@ -3213,9 +3221,16 @@ template <typename _Tp>
inline constexpr bool is_rvalue_reference_v = false;
template <typename _Tp>
inline constexpr bool is_rvalue_reference_v<_Tp&&> = true;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_object_pointer)
+template <typename _Tp>
+ inline constexpr bool is_member_object_pointer_v =
+ __is_member_object_pointer(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_member_object_pointer_v =
is_member_object_pointer<_Tp>::value;
+#endif
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer)
template <typename _Tp>
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