https://gcc.gnu.org/g:d5e994f44653b913e24753351e713befffbf1a01
commit r15-1249-gd5e994f44653b913e24753351e713befffbf1a01
Author: Ken Matsui <kmat...@gcc.gnu.org>
Date: Wed Feb 14 05:50:49 2024 -0800
libstdc++: Optimize std::remove_extent compilation performance
This patch optimizes the compilation performance of std::remove_extent
by dispatching to the new __remove_extent built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (remove_extent): Use __remove_extent
built-in trait.
Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
Reviewed-by: Patrick Palka <ppa...@redhat.com>
Reviewed-by: Jonathan Wakely <jwak...@redhat.com>
Diff:
---
libstdc++-v3/include/std/type_traits | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libstdc++-v3/include/std/type_traits
b/libstdc++-v3/include/std/type_traits
index e179015be934..02d7a3e50171 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2078,6 +2078,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Array modifications.
/// remove_extent
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__remove_extent)
+ template<typename _Tp>
+ struct remove_extent
+ { using type = __remove_extent(_Tp); };
+#else
template<typename _Tp>
struct remove_extent
{ using type = _Tp; };
@@ -2089,6 +2094,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
struct remove_extent<_Tp[]>
{ using type = _Tp; };
+#endif
/// remove_all_extents
template<typename _Tp>
