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 6C6403856943; Fri, 13 Oct 2023 22:43:16 +0000 (GMT) ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 6C6403856943 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=205.220.177.146 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1697237000; cv=none; b=s6X6E0kf5AURbxIeuVeIWZH21ngp48R6DsVIONzS8k+s/7fswRDGXRaxmsIfCJp9Ezh1IqewKlIcQU2hqDA8kMvstOf5/EZqZBnTac2J0MkcsbY8D0q1kcy1CUs7kqKJWc9smYudAp88RTrazAzAadvadt4GSelsMTa2HPW719U= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1697237000; c=relaxed/simple; bh=/ZpKzUC/+Cn+6c4i+PdtJvMDzWz2wSkg6dqToHkptIU=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=kglCAAYevoB69tAPBZ5cYV9nu9Q1GQOUijKGPOtnP306Hxa8myK7esEmV6dcrTTqZHru5DD+wyAXXUHhbKHkSo/OpmtX9Dz3B1/TESmBnkqZKGaCHleA5SiPX3Mdz/SxF0aC1cUKe8QUmmAmLZvKVNo6yEVT9Pc7SF2jZS+RENE= ARC-Authentication-Results: i=1; server2.sourceware.org DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 6C6403856943 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 (m0247481.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39DMd4Eu025980; Fri, 13 Oct 2023 22:43:16 GMT Received: from mxout22.s.uw.edu (mxout22.s.uw.edu [128.95.242.222]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3tqb8ma0mc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 13 Oct 2023 22:43:15 +0000 Received: from smtp.washington.edu (smtp.washington.edu [128.208.60.54]) by mxout22.s.uw.edu (8.14.4+UW20.07/8.14.4+UW22.04) with ESMTP id 39DMh2UZ021601 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 13 Oct 2023 15:43:02 -0700 X-Auth-Received: from kmatsui-ThinkPad-X1-Carbon-Gen-9.dhcp4.washington.edu ([10.19.18.191]) (authenticated authid=kmatsui) by smtp.washington.edu (8.16.1+UW21.10/8.14.4+UW19.10) with ESMTPSA id 39DMdx1a016619 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 13 Oct 2023 15:43:02 -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 v19 23/40] libstdc++: Optimize is_reference trait performance Date: Fri, 13 Oct 2023 15:37:37 -0700 Message-ID: <20231013223957.1634024-24-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231013223957.1634024-1-kmatsui@gcc.gnu.org> References: <20231013211206.1215663-1-kmatsui@gcc.gnu.org> <20231013223957.1634024-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: kTdIoD7Agry36Il-9d3ghDZo_NkmffCc X-Proofpoint-GUID: kTdIoD7Agry36Il-9d3ghDZo_NkmffCc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-13_12,2023-10-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1034 suspectscore=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=782 impostorscore=0 priorityscore=1501 mlxscore=0 spamscore=0 adultscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310130197 X-Spam-Status: No, score=-13.1 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_reference trait by dispatching to the new __is_reference built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_reference): Use __is_reference built-in trait. (is_reference_v): Likewise. Signed-off-by: Ken Matsui --- libstdc++-v3/include/std/type_traits | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 792213ebfe8..36ad9814047 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -682,6 +682,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION // Composite type categories. /// is_reference +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference) + template + struct is_reference + : public __bool_constant<__is_reference(_Tp)> + { }; +#else template struct is_reference : public false_type @@ -696,6 +702,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct is_reference<_Tp&&> : public true_type { }; +#endif /// is_arithmetic template @@ -3264,12 +3271,19 @@ template inline constexpr bool is_class_v = __is_class(_Tp); template inline constexpr bool is_function_v = is_function<_Tp>::value; + +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference) +template + inline constexpr bool is_reference_v = __is_reference(_Tp); +#else template inline constexpr bool is_reference_v = false; template inline constexpr bool is_reference_v<_Tp&> = true; template inline constexpr bool is_reference_v<_Tp&&> = true; +#endif + template inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; template -- 2.42.0