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 CB5963870863; Sat, 11 May 2024 09:02:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org CB5963870863 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 CB5963870863 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=1715418147; cv=none; b=FqRJpAz4XBlOIuWd+lhU+aSzMmpfAUf7FakB0JYcunhjZ/bYkKZCfGbeMxfDXbP0k57hBRjH2lYSzDLY4XQRIUCOnNlM3hAd7QWyOmMnD92BF4UAaeyiKmVX4zHTrADXwzwJDD05l4Fu+cVm6lQE9bh3J04WQEHzD5al+oB8FQk= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1715418147; c=relaxed/simple; bh=rVMrKoQxXgzL9ULnTlFSgjLsk41ADrAyC1AF811cTlM=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=NJEhpFjTffyyGIXSueq0jEriZh34IkRhIL6UFUV1oZWcP3OEE0EPUijkYoctx3z0/LRbEc4CJ+Be0MBKEux+zOhsK3m/6uM05gRzxKLehsZst7o/+Vp9oCxAc9muuvSvAkcbALdXJ5UxW5GlkpEbNXLzpW+9ucl7mP3uZ0Z5mTY= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from pps.filterd (m0247480.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 44B8tYAn003276; Sat, 11 May 2024 09:02:14 GMT Received: from mxout25.s.uw.edu (mxout25.s.uw.edu [140.142.234.175]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3y23jp89pe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 11 May 2024 09:02:14 +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 44B92Brk027974 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 11 May 2024 02:02:11 -0700 X-Auth-Received: from ken-20xw00qgus.dhcp4.washington.edu ([10.154.75.2]) (authenticated authid=kmatsui) by smtp.washington.edu (8.16.1+UW21.10/8.14.4+UW24.02) with ESMTPSA id 44B92ApS000628 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 11 May 2024 02:02:10 -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 v26 10/13] libstdc++: Optimize std::decay compilation performance Date: Sat, 11 May 2024 02:01:27 -0700 Message-ID: <20240511090130.248174-10-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240511090130.248174-1-kmatsui@gcc.gnu.org> References: <20240510161405.194750-21-kmatsui@gcc.gnu.org> <20240511090130.248174-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: THntp-wW0aXdn7AUnRaRlOEvmE3spk3z X-Proofpoint-GUID: THntp-wW0aXdn7AUnRaRlOEvmE3spk3z X-outbound-smtp: 1 x-header: uw-relay-non-domains X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-05-11_04,2024-05-10_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 spamscore=0 impostorscore=0 adultscore=0 suspectscore=0 mlxscore=0 mlxlogscore=673 clxscore=1034 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405010000 definitions=main-2405110066 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 __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 824cad90a25..4cc587d4e08 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(__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 @@ -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