From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-00641c01.pphosted.com (mx0b-00641c01.pphosted.com [205.220.177.146]) by sourceware.org (Postfix) with ESMTPS id 297E238C75BB; Fri, 15 Sep 2023 02:36:49 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 297E238C75BB Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=gcc.gnu.org Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=gcc.gnu.org Received: from pps.filterd (m0247479.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38F2Xb2J031883; Fri, 15 Sep 2023 02:36:48 GMT Received: from mxout25.s.uw.edu (mxout25.s.uw.edu [140.142.234.175]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3t44j6d8up-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Sep 2023 02:36:48 +0000 Received: from smtp.washington.edu (smtp.washington.edu [128.208.60.54]) by mxout25.s.uw.edu (8.14.4+UW20.07/8.14.4+UW22.04) with ESMTP id 38F2agFR029941 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 Sep 2023 19:36:42 -0700 X-Auth-Received: from localhost.localdomain ([10.154.75.179]) (authenticated authid=kmatsui) by smtp.washington.edu (8.16.1+UW21.10/8.14.4+UW19.10) with ESMTPSA id 38F2ago1001192 (version=TLSv1.2 cipher=DHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Thu, 14 Sep 2023 19:36:42 -0700 X-UW-Orig-Sender: kmatsui@smtp.washington.edu From: Ken Matsui To: gcc-patches@gcc.gnu.org Cc: libstdc++@gcc.gnu.org, Ken Matsui Subject: [PATCH v13 09/40] libstdc++: Optimize is_unbounded_array trait performance Date: Thu, 14 Sep 2023 19:34:49 -0700 Message-ID: <20230915023640.75216-10-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230915023640.75216-1-kmatsui@gcc.gnu.org> References: <20230915022305.74083-1-kmatsui@gcc.gnu.org> <20230915023640.75216-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: 7GvCR66xTTjyG5RdNJJUrb3nLqmeCJH1 X-Proofpoint-ORIG-GUID: 7GvCR66xTTjyG5RdNJJUrb3nLqmeCJH1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-15_02,2023-09-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 adultscore=0 clxscore=1034 malwarescore=0 impostorscore=0 mlxscore=0 bulkscore=0 mlxlogscore=625 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309150021 X-Spam-Status: No, score=-13.0 required=5.0 tests=BAYES_00,GIT_PATCH_0,JMQ_SPF_NEUTRAL,KAM_DMARC_STATUS,RCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NEUTRAL,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: This patch optimizes the performance of the is_unbounded_array trait 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 --- 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 4e8165e5af5..cb3d9e238fa 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -3541,11 +3541,16 @@ template /// 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 + inline constexpr bool is_unbounded_array_v = __is_unbounded_array(_Tp); +# else template inline constexpr bool is_unbounded_array_v = false; template inline constexpr bool is_unbounded_array_v<_Tp[]> = true; +# endif /// True for a type that is an array of known bound. /// @since C++20 -- 2.42.0