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 B3785384AB53; Thu, 2 May 2024 16:16:38 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org B3785384AB53 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 B3785384AB53 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=1714666614; cv=none; b=VG2NrLSY+13gVHpo161wAN7qWnoXhDPzkGRToonxGWb0iJ0dZwdCmiokmNSRoWtkMbFcYNJhNNYEvluvClNznZ8D18gxNEcZeswvgM0SbeBX5zuo3fOz8WLBLCq3fPLApjuoweF6s89LvzVYIGOIEJvw2aCDZQYz20KmkMx5YPM= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1714666614; c=relaxed/simple; bh=gUrOpT3YVqZYD74/Vg9/FJq0FVqylh/usuP5hlYDAkA=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=XRDfQyoxyHWjtqIlwzJ38OAcSCTRUo5FGZWc2ERcombutvLV5D97mRSh/SQJNFS9UsHfUlRpA+iIDHXnOrm0+t5/bS917pBHa8ujtqlp/RUPD/6qcfl33rZ8WPGr7MsI5qfVD+h7ro4+M5b3wfOVkzKVXI1BRZ0zk8FU74vGEf0= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from pps.filterd (m0247479.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 442GG7WB026272; Thu, 2 May 2024 16:16:38 GMT Received: from mxout25.s.uw.edu (mxout25.s.uw.edu [140.142.234.175]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3xv4e2uemv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 02 May 2024 16:16:37 +0000 (GMT) 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+UW24.02) with ESMTP id 442GGGih024922 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 2 May 2024 09:16:16 -0700 X-Auth-Received: from ken-20xw00qgus.dhcp4.washington.edu ([10.154.75.239]) (authenticated authid=kmatsui) by smtp.washington.edu (8.16.1+UW21.10/8.14.4+UW24.02) with ESMTPSA id 442GGFox023119 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 2 May 2024 09:16:16 -0700 X-UW-Orig-Sender: kmatsui@smtp.washington.edu From: Ken Matsui To: gcc-patches@gcc.gnu.org Cc: libstdc++@gcc.gnu.org, jason@redhat.com, Ken Matsui Subject: [PATCH v16 20/26] libstdc++: Optimize std::decay compilation performance Date: Thu, 2 May 2024 09:13:46 -0700 Message-ID: <20240502161614.3705912-21-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240502161614.3705912-1-kmatsui@gcc.gnu.org> References: <20240228192843.188979-1-kmatsui@gcc.gnu.org> <20240502161614.3705912-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: 1UHZZrahqujaahRdO7F9dRO2hq0IMaVp X-Proofpoint-ORIG-GUID: 1UHZZrahqujaahRdO7F9dRO2hq0IMaVp X-outbound-smtp: 1 x-header: uw-relay-non-domains X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1011,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-05-02_05,2024-05-02_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 bulkscore=0 suspectscore=0 clxscore=1034 mlxlogscore=799 spamscore=0 mlxscore=0 phishscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2404010003 definitions=main-2405020106 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,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 compilation performance of std::decay by dispatching to the new __builtin_decay trait. libstdc++-v3/ChangeLog: * include/std/type_traits (decay): Use __builtin_decay 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 36ac900605a..45c73d477d0 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -2316,6 +2316,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION /// @cond undocumented +#if _GLIBCXX_USE_BUILTIN_TRAIT(__builtin_decay) + template + struct decay + { using type = __builtin_decay(_Tp); }; +#else // Decay trait for arrays and functions, used for perfect forwarding // in make_pair, make_tuple, etc. template @@ -2347,6 +2352,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template struct decay<_Tp&&> { using type = typename __decay_selector<_Tp>::type; }; +#endif /// @cond undocumented -- 2.44.0