From: Ken Matsui <kmatsui@gcc.gnu.org>
Date: Tue, 12 Sep 2023 02:15:21 +0000 (-0700)
Subject: libstdc++: Optimize std::is_bounded_array compilation performance
X-Git-Tag: basepoints/gcc-15~3515
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8843cff6c98cb0789a1ec6f51be6c5122fc1b5e9;p=thirdparty%2Fgcc.git

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 --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 64f9d67fe298..2a1a0aa80ffd 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