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* [gcc r14-6626] libstdc++: Optimize std::is_member_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: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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