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 BC7733864877; Mon, 19 Feb 2024 13:51:51 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org BC7733864877 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 BC7733864877 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=1708350715; cv=none; b=ZzueSYH+woYYuIZbQ/+fearhIz3ob4TxAk5QAYyNnYmDKLNqASxkHBTowRpYd2trVhV31msbgcU9BsNqqQZyaRJJSo5p3f00nbMScmVD71zbl8YuRlM+B7LYmClxyAj4I7bJ5S7/WsRVAxNQCqXFa9hjQg8agYSKEl9vTnmSGY8= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708350715; c=relaxed/simple; bh=x3HabDfYE+N1rP9G2WHdqZ4tP3FpTiSMwVAtW/KR4mA=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=b3ZSGLr/CiW9J+Zr4bpg9udoxbin/pPEY/F4k3VD5SejiupSgdg0umd7RA9YmsdYF3/L7nUgOc+2NbYG9zWZQU5Nwwc3GXOiLwb3hKl0Qdpyk+xtO3JsKVYZpBXdIXYv/tCHV4GKKajyRg1V8SLssXBcro9u8vYEHfLliiO/d8w= ARC-Authentication-Results: i=1; server2.sourceware.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 41JDisa7025480; Mon, 19 Feb 2024 13:51:51 GMT Received: from mxout25.s.uw.edu (mxout25.s.uw.edu [140.142.234.175]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3wc7s083pk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 19 Feb 2024 13:51:50 +0000 Received: from smtp.washington.edu (smtp.washington.edu [140.142.234.157]) by mxout25.s.uw.edu (8.14.4+UW20.07/8.14.4+UW24.02) with ESMTP id 41JDpb6k004107 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Feb 2024 05:51:37 -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 41JDpZRc001026 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 19 Feb 2024 05:51:36 -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 v7 20/22] libstdc++: Optimize std::decay compilation performance Date: Mon, 19 Feb 2024 05:51:27 -0800 Message-ID: <20240219135129.3635809-20-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240219135129.3635809-1-kmatsui@gcc.gnu.org> References: <20240106050754.3054782-1-kmatsui@gcc.gnu.org> <20240219135129.3635809-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: uj4qXpW6OajYuTYH9KdjUAEcR8w5yk7d X-Proofpoint-GUID: uj4qXpW6OajYuTYH9KdjUAEcR8w5yk7d 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=2024-02-19_09,2024-02-19_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxscore=0 clxscore=1034 lowpriorityscore=0 impostorscore=0 mlxlogscore=764 adultscore=0 spamscore=0 malwarescore=0 suspectscore=0 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402190103 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 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