From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-00641c01.pphosted.com (mx0a-00641c01.pphosted.com [205.220.165.146]) by sourceware.org (Postfix) with ESMTPS id 1CCD3385840E; Wed, 21 Feb 2024 09:37:01 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 1CCD3385840E 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 1CCD3385840E Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=205.220.165.146 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708508228; cv=none; b=HvumDdg3LHFd8MP4xQ0HPHLzVVmAUyOYXMH4VcAsF6Zw5+SZUFuqsmEgP3rgwtr0dWA5293zSxEk5U69VYVnGnP7GFTlfamPyVLSf4pHm08TS5fqn3Wpy8EhpLE7wcTLEqEpXX4poyBBwv3bkyGWpB7sDL17ioAe7o9I7txGbrY= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708508228; c=relaxed/simple; bh=x3HabDfYE+N1rP9G2WHdqZ4tP3FpTiSMwVAtW/KR4mA=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=C+qO1PeXghn+qdUadCrdxUabJM+z8zmMd3QG2MyInelExTVK1i65xmfm6Ccb7DW0XK1ZgnmQof6pD9YcOUTdvVuHESr0LZH2WAOgd9+Dvs5lm3K9AoNKC2k5u9B9RiCKdC/M0PU3B8HKZ1tnY3hh6IQ42jN303DDzj+/VHDVYXw= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from pps.filterd (m0247473.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 41L9YHGh013120; Wed, 21 Feb 2024 09:37:01 GMT Received: from mxout23.cac.washington.edu (mxout23.cac.washington.edu [140.142.32.140]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3wd56dbe5r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 21 Feb 2024 09:37:00 +0000 Received: from smtp.washington.edu (smtp.washington.edu [128.208.60.132]) by mxout23.cac.washington.edu (8.14.4+UW20.07/8.14.4+UW24.02) with ESMTP id 41L9aLRK020583 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 21 Feb 2024 01:36:21 -0800 X-Auth-Received: from kmatsui-ThinkPad-X1-Carbon-Gen-9.dhcp4.washington.edu ([10.154.74.128]) (authenticated authid=kmatsui) by smtp.washington.edu (8.16.1+UW21.10/8.14.4+UW24.02) with ESMTPSA id 41L9aJVk002942 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 21 Feb 2024 01:36:21 -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 v13 20/26] libstdc++: Optimize std::decay compilation performance Date: Wed, 21 Feb 2024 01:36:10 -0800 Message-ID: <20240221093616.4001742-20-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240221093616.4001742-1-kmatsui@gcc.gnu.org> References: <20240221085142.3779280-26-kmatsui@gcc.gnu.org> <20240221093616.4001742-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: 1ZdNVU-sBeHuIvo103tNqid-k_PmgaRw X-Proofpoint-GUID: 1ZdNVU-sBeHuIvo103tNqid-k_PmgaRw 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=2024-02-20_06,2024-02-20_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=627 suspectscore=0 malwarescore=0 bulkscore=0 adultscore=0 spamscore=0 phishscore=0 impostorscore=0 mlxscore=0 lowpriorityscore=0 clxscore=1034 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402210075 X-Spam-Status: No, score=-12.8 required=5.0 tests=BAYES_00,GIT_PATCH_0,JMQ_SPF_NEUTRAL,KAM_DMARC_STATUS,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,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 18a5e4de2d3..2f4c8dd3b21 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 -- 2.43.2