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[v16,12/26] libstdc++: Optimize std::remove_extent compilation performance

Message ID 20240502161614.3705912-13-kmatsui@gcc.gnu.org
State New
Headers show
Series Optimize more type traits | expand

Commit Message

Ken Matsui May 2, 2024, 4:13 p.m. UTC 
This patch optimizes the compilation performance of std::remove_extent
by dispatching to the new __builtin_remove_extent trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (remove_extent): Use
	__builtin_remove_extent 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 59d952194af..36136440fdd 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2092,6 +2092,11 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // Array modifications.
 
   /// remove_extent
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__builtin_remove_extent)
+  template<typename _Tp>
+    struct remove_extent
+    { using type = __builtin_remove_extent(_Tp); };
+#else
   template<typename _Tp>
     struct remove_extent
     { using type = _Tp; };
@@ -2103,6 +2108,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct remove_extent<_Tp[]>
     { using type = _Tp; };
+#endif
 
   /// remove_all_extents
   template<typename _Tp>