From patchwork Wed Feb 28 19:26:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ken Matsui X-Patchwork-Id: 86534 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id D737D3858417 for ; Wed, 28 Feb 2024 19:36:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D737D3858417 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1709148978; bh=y8LsNZKy6kMQm1J0qzNqNC8bZqkzX7m2KZgi4+l1wPg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=clCN5MYMxoKNoHsl9GpoIqyZZ+Nrtu2D1TkXT37jXtp4oh/YdGjmzmbBdVcbqF0CE ttcIeQK+4A+jUu6U67tVSQaHB3GUSXmzXvs+VGup6q0w4fP09MCz96hZH5ZrLxJO9B lQItVuP4zZ0VdIjenw5Q+NvHheWKQ3lJ559M6JW4= X-Original-To: gcc-patches@gcc.gnu.org Delivered-To: gcc-patches@gcc.gnu.org Received: from mx0a-00641c01.pphosted.com (mx0a-00641c01.pphosted.com [205.220.165.146]) by sourceware.org (Postfix) with ESMTPS id 8E7CF38582B4; Wed, 28 Feb 2024 19:29:06 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 8E7CF38582B4 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 8E7CF38582B4 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=1709148550; cv=none; b=w/3Ejz1/uO9oGSCW+VSgjCfJ46ppN7TRo7IGY+Uqiva/dF3xZ1cBxf7Sz562KK/WJMkq7+OX6pS2Bp+YJDnWeTwIbSBUAW2uQSBk+l2UDMJzkeABSktnjvY5Bb749ThMZ2klIvK4lS+7gPJsPQROhN7bQxCxmMmsBV9/0l9JZqQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1709148550; c=relaxed/simple; bh=TjfqqNKnkQNIZBUx0q9VkuYTDidE6SEyaROxlFn1DT8=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=exp0hiCiA2we5rgCfhYQEz0iSRUfsqoAMlubVzJabiz7DU9TVo06PAektsb1eSRCwqnNRJ75FrWFUUS//nfreAgcwE/lUVsxoVrn/bFNyZdu+eNhOjY8v7dcuXoQvjPwPOJl7TlJuXVUPIktEsZNV2nvVgzSND2VjUVGl0M60Rk= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from pps.filterd (m0247470.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 41SJSh9E001591; Wed, 28 Feb 2024 19:29:05 GMT Received: from mxout24.cac.washington.edu (mxout24.cac.washington.edu [140.142.234.158]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3wj9n6h21a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 28 Feb 2024 19:29:05 +0000 Received: from smtp.washington.edu (smtp.washington.edu [140.142.234.157]) by mxout24.cac.washington.edu (8.14.4+UW20.07/8.14.4+UW24.02) with ESMTP id 41SJSqjR010164 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 28 Feb 2024 11:28:52 -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 41SJSoTc015429 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 28 Feb 2024 11:28:52 -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 v14 20/26] libstdc++: Optimize std::decay compilation performance Date: Wed, 28 Feb 2024 11:26:25 -0800 Message-ID: <20240228192843.188979-21-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240228192843.188979-1-kmatsui@gcc.gnu.org> References: <20240221093616.4001742-1-kmatsui@gcc.gnu.org> <20240228192843.188979-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 X-Proofpoint-GUID: IEgjlqAN4HTW6wSb8ISDx_C_N_UDP1jD X-Proofpoint-ORIG-GUID: IEgjlqAN4HTW6wSb8ISDx_C_N_UDP1jD 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=2024-02-28_08,2024-02-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1034 suspectscore=0 malwarescore=0 phishscore=0 impostorscore=0 spamscore=0 mlxlogscore=627 bulkscore=0 priorityscore=1501 lowpriorityscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402280153 X-Spam-Status: No, score=-13.0 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_STATUS, 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 X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org 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