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[v7,14/22] libstdc++: Optimize std::remove_all_extents compilation performance

Message ID 20240219135129.3635809-14-kmatsui@gcc.gnu.org
State New
Headers show
Series [v7,01/22] c++: Implement __is_const built-in trait | expand

Commit Message

Ken Matsui Feb. 19, 2024, 1:51 p.m. UTC 
This patch optimizes the compilation performance of
std::remove_all_extents by dispatching to the new __remove_all_extents
built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (remove_all_extents): Use
	__remove_all_extents built-in trait.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 73ddce351fd..34475e6279a 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2111,6 +2111,11 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
 
   /// remove_all_extents
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__remove_all_extents)
+  template<typename _Tp>
+    struct remove_all_extents
+    { using type = __remove_all_extents(_Tp); };
+#else
   template<typename _Tp>
     struct remove_all_extents
     { using type = _Tp; };
@@ -2122,6 +2127,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct remove_all_extents<_Tp[]>
     { using type = typename remove_all_extents<_Tp>::type; };
+#endif
 
 #if __cplusplus > 201103L
   /// Alias template for remove_extent