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[v20,09/40] libstdc++: Optimize is_array trait performance

Message ID	20231016001227.2717180-10-kmatsui@gcc.gnu.org
State	Accepted
Headers	Received-SPF: pass (google.com: domain of gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org designates 8.43.85.97 as permitted sender) client-ip=8.43.85.97; DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 9C41C385772D From: Ken Matsui <kmatsui@gcc.gnu.org> To: gcc-patches@gcc.gnu.org Cc: libstdc++@gcc.gnu.org, Ken Matsui <kmatsui@gcc.gnu.org> Subject: [PATCH v20 09/40] libstdc++: Optimize is_array trait performance Date: Sun, 15 Oct 2023 17:09:53 -0700 Message-ID: <20231016001227.2717180-10-kmatsui@gcc.gnu.org> In-Reply-To: <20231016001227.2717180-1-kmatsui@gcc.gnu.org> References: <20231013223957.1634024-1-kmatsui@gcc.gnu.org> <20231016001227.2717180-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: list Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX
Series	Optimize type traits performance \| [v20,00/40] Optimize type traits performance [v20,01/40] c++: Sort built-in traits alphabetically [v20,02/40] c-family, c++: Look up built-in traits via identifier node [v20,03/40] c++: Accept the use of built-in trait identifiers [v20,04/40] c++: Implement __is_const built-in trait [v20,05/40] libstdc++: Optimize is_const trait performance [v20,06/40] c++: Implement __is_volatile built-in trait [v20,07/40] libstdc++: Optimize is_volatile trait performance [v20,08/40] c++: Implement __is_array built-in trait [v20,09/40] libstdc++: Optimize is_array trait performance [v20,10/40] c++: Implement __is_unbounded_array built-in trait [v20,11/40] libstdc++: Optimize is_unbounded_array trait performance [v20,12/40] c++: Implement __is_bounded_array built-in trait [v20,13/40] libstdc++: Optimize is_bounded_array trait performance [v20,14/40] c++: Implement __is_scoped_enum built-in trait [v20,15/40] libstdc++: Optimize is_scoped_enum trait performance [v20,16/40] c++: Implement __is_member_pointer built-in trait [v20,17/40] libstdc++: Optimize is_member_pointer trait performance [v20,18/40] c++: Implement __is_member_function_pointer built-in trait [v20,19/40] libstdc++: Optimize is_member_function_pointer trait performance [v20,20/40] c++: Implement __is_member_object_pointer built-in trait [v20,21/40] libstdc++: Optimize is_member_object_pointer trait performance [v20,22/40] c++: Implement __is_reference built-in trait [v20,23/40] libstdc++: Optimize is_reference trait performance [v20,24/40] c++: Implement __is_function built-in trait [v20,25/40] libstdc++: Optimize is_function trait performance [v20,26/40] libstdc++: Optimize is_object trait performance [v20,27/40] c++: Implement __remove_pointer built-in trait [v20,28/40] libstdc++: Optimize remove_pointer trait performance [v20,29/40] c++: Implement __is_pointer built-in trait [v20,30/40] libstdc++: Optimize is_pointer trait performance [v20,31/40] c++: Implement __is_arithmetic built-in trait [v20,32/40] libstdc++: Optimize is_arithmetic trait performance [v20,33/40] libstdc++: Optimize is_fundamental trait performance [v20,34/40] libstdc++: Optimize is_compound trait performance [v20,35/40] c++: Implement __is_unsigned built-in trait [v20,36/40] libstdc++: Optimize is_unsigned trait performance [v20,37/40] c++: Implement __is_signed built-in trait [v20,38/40] libstdc++: Optimize is_signed trait performance [v20,39/40] c++: Implement __is_scalar built-in trait [v20,40/40] libstdc++: Optimize is_scalar trait performance

Checks

Context	Check	Description
snail/gcc-patch-check	success	Github commit url

Commit Message

Ken Matsui Oct. 16, 2023, 12:09 a.m. UTC

  This patch optimizes the performance of the is_array trait by dispatching to
the new __is_array built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_array): Use __is_array built-in trait.
	(is_array_v): Likewise.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff mbox series

Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index c01f65df22b..4e8165e5af5 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -523,6 +523,12 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { };
 
   /// is_array
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array)
+  template<typename _Tp>
+    struct is_array
+    : public __bool_constant<__is_array(_Tp)>
+    { };
+#else
   template<typename>
     struct is_array
     : public false_type { };
@@ -534,6 +540,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct is_array<_Tp[]>
     : public true_type { };
+#endif
 
   template<typename>
     struct __is_pointer_helper
@@ -3183,12 +3190,17 @@  template <typename _Tp>
 template <typename _Tp>
   inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
 
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array)
+template <typename _Tp>
+  inline constexpr bool is_array_v = __is_array(_Tp);
+#else
 template <typename _Tp>
   inline constexpr bool is_array_v = false;
 template <typename _Tp>
   inline constexpr bool is_array_v<_Tp[]> = true;
 template <typename _Tp, size_t _Num>
   inline constexpr bool is_array_v<_Tp[_Num]> = true;
+#endif
 
 template <typename _Tp>
   inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;