From: Ken Matsui <kmatsui@gcc.gnu.org>
Date: Mon, 11 Sep 2023 20:58:35 +0000 (-0700)
Subject: libstdc++: Optimize std::is_unbounded_array compilation performance
X-Git-Tag: basepoints/gcc-16~8306
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b38aefbbc90a3334c6c5ba6569816d348a1a0c91;p=thirdparty%2Fgcc.git

libstdc++: Optimize std::is_unbounded_array compilation performance

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>
Reviewed-by: Patrick Palka <ppalka@redhat.com>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
---

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 748fa186881..efbe273d38a 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -3682,11 +3682,16 @@ 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