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* [gcc r14-6627] libstdc++: Optimize std::is_member_function_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: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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