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[v7,08/22] libstdc++: Optimize std::is_unbounded_array compilation performance

Message ID 20240219135129.3635809-8-kmatsui@gcc.gnu.org
State Superseded
Headers
Series [v7,01/22] c++: Implement __is_const built-in trait |

Commit Message

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

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_unbounded_array_v): Use
	__is_unbounded_array built-in trait.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 6407738a726..c4585a23df9 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -3706,11 +3706,16 @@  template<typename _Ret, typename _Fn, typename... _Args>
   /// True for a type that is an array of unknown bound.
   /// @ingroup variable_templates
   /// @since C++20
+# if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unbounded_array)
+  template<typename _Tp>
+    inline constexpr bool is_unbounded_array_v = __is_unbounded_array(_Tp);
+# else
   template<typename _Tp>
     inline constexpr bool is_unbounded_array_v = false;
 
   template<typename _Tp>
     inline constexpr bool is_unbounded_array_v<_Tp[]> = true;
+# endif
 
   /// True for a type that is an array of known bound.
   /// @since C++20