[gcc r14-6624] libstdc++: Optimize std::is_bounded_array compilation performance

[gcc r14-6624] libstdc++: Optimize std::is_bounded_array compilation performance

[Ken Matsui]

https://gcc.gnu.org/g:8843cff6c98cb0789a1ec6f51be6c5122fc1b5e9

commit r14-6624-g8843cff6c98cb0789a1ec6f51be6c5122fc1b5e9
Author: Ken Matsui <kmatsui@gcc.gnu.org>
Date:   Mon Sep 11 19:15:21 2023 -0700

    libstdc++: Optimize std::is_bounded_array compilation performance
    
    This patch optimizes the compilation performance of std::is_bounded_array
    by dispatching to the new __is_bounded_array built-in trait.
    
    libstdc++-v3/ChangeLog:
    
            * include/std/type_traits (is_bounded_array_v): Use
            __is_bounded_array built-in trait.
    
    Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
    Reviewed-by: Jonathan Wakely <jwakely@redhat.com>

Diff:
---
 libstdc++-v3/include/std/type_traits | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 64f9d67fe29..2a1a0aa80ff 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -3506,11 +3506,16 @@ template<typename _Ret, typename _Fn, typename... _Args>
   /// True for a type that is an array of known bound.
   /// @ingroup variable_templates
   /// @since C++20
+# if _GLIBCXX_USE_BUILTIN_TRAIT(__is_bounded_array)
+  template<typename _Tp>
+    inline constexpr bool is_bounded_array_v = __is_bounded_array(_Tp);
+# else
   template<typename _Tp>
     inline constexpr bool is_bounded_array_v = false;
 
   template<typename _Tp, size_t _Size>
     inline constexpr bool is_bounded_array_v<_Tp[_Size]> = true;
+# endif
 
   /// True for a type that is an array of unknown bound.
   /// @ingroup variable_templates