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 859D938654A1; Thu, 15 Feb 2024 15:21:16 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 859D938654A1 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 ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 859D938654A1 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=1708010483; cv=none; b=PKwQEsdfztb6J8dXRJZ66NM+Yy9O/Ajw/GppZnAVyL166OMBNzw0naxhrmieg6Vpd6RmCGWCf0hIXUw2BU6O36oKcblk8R3+S80udxF9l7UQJzVfb2el5iulhESgcj/5wyRuAszeFAlkttX6mTRKO1D9DCQ/dNsoNxe15UDTsq0= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708010483; c=relaxed/simple; bh=FQrfDuZxvdnK0SsdsOow2XqmwdJuOwFfYrJfY4elRNk=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=tEzLSOej4QQ4igUb3VOrAYcSnIelw7idD2I1YxWl4U0u5hjAtICtEzXeWH0/94sEiPQgjIA6HxTahwLrI+i84j9qxDviYCTVSUjVy6ydMjESbJboGGtLrXIdcPWqYyWzLdJDT38Kb006I9cIRaGDRGbOg5Jmq+ZOT8bgiy9txCs= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from pps.filterd (m0247476.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 41FFK7rC010200; Thu, 15 Feb 2024 15:21:16 GMT Received: from mxout21.s.uw.edu (mxout21.s.uw.edu [140.142.32.139]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3w92uh6rp0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Feb 2024 15:21:15 +0000 Received: from smtp.washington.edu (smtp.washington.edu [140.142.234.157]) by mxout21.s.uw.edu (8.14.4+UW20.07/8.14.4+UW24.02) with ESMTP id 41FFKl8e013150 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 15 Feb 2024 07:20:47 -0800 X-Auth-Received: from kmatsui-ThinkPad-X1-Carbon-Gen-9.dhcp4.washington.edu ([10.154.74.143]) (authenticated authid=kmatsui) by smtp.washington.edu (8.16.1+UW21.10/8.14.4+UW24.02) with ESMTPSA id 41FFKkgw029956 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Feb 2024 07:20:47 -0800 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 v5 12/14] libstdc++: Optimize std::decay compilation performance Date: Thu, 15 Feb 2024 07:20:35 -0800 Message-ID: <20240215152037.720162-12-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240215152037.720162-1-kmatsui@gcc.gnu.org> References: <20240215045258.3025806-1-kmatsui@gcc.gnu.org> <20240215152037.720162-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: SrDU0ZPiy51OkGPeRyOtgMk5q9IeMWEV X-Proofpoint-ORIG-GUID: SrDU0ZPiy51OkGPeRyOtgMk5q9IeMWEV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-15_14,2024-02-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=793 mlxscore=0 priorityscore=1501 malwarescore=0 spamscore=0 impostorscore=0 adultscore=0 phishscore=0 bulkscore=0 clxscore=1034 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402150123 X-Spam-Status: No, score=-13.3 required=5.0 tests=BAYES_00,GIT_PATCH_0,JMQ_SPF_NEUTRAL,KAM_DMARC_STATUS,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_NEUTRAL,TXREP,T_SCC_BODY_TEXT_LINE 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 compilation performance of std::decay by dispatching to the new __decay built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (decay): Use __decay built-in trait. Signed-off-by: Ken Matsui --- libstdc++-v3/include/std/type_traits | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 219d36fabba..90718d772dd 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -2288,6 +2288,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION /// @cond undocumented +#if _GLIBCXX_USE_BUILTIN_TRAIT(__decay) + template + struct decay + { using type = __decay(_Tp); }; +#else // Decay trait for arrays and functions, used for perfect forwarding // in make_pair, make_tuple, etc. template @@ -2319,6 +2324,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template struct decay<_Tp&&> { using type = typename __decay_selector<_Tp>::type; }; +#endif /// @cond undocumented -- 2.43.0