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[v12,28/40] libstdc++: Optimize remove_pointer trait performance

Message ID 20230915022305.74083-29-kmatsui@gcc.gnu.org
State New
Headers show
Series Optimize type traits performance | expand

Commit Message

Ken Matsui Sept. 15, 2023, 2:21 a.m. UTC 
This patch optimizes the performance of the remove_pointer trait by
dispatching to the new remove_pointer built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (remove_pointer): Use __remove_pointer
	built-in trait.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 674d398c075..9c56d15c0b7 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2105,6 +2105,12 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   // Pointer modifications.
 
+  /// remove_pointer
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__remove_pointer)
+  template<typename _Tp>
+    struct remove_pointer
+    { using type = __remove_pointer(_Tp); };
+#else
   template<typename _Tp, typename>
     struct __remove_pointer_helper
     { using type = _Tp; };
@@ -2113,11 +2119,11 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
     struct __remove_pointer_helper<_Tp, _Up*>
     { using type = _Up; };
 
-  /// remove_pointer
   template<typename _Tp>
     struct remove_pointer
     : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>>
     { };
+#endif
 
   template<typename _Tp, typename = void>
     struct __add_pointer_helper