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 CAE153858419; Sat, 6 Jan 2024 05:08:47 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org CAE153858419 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 CAE153858419 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=1704517729; cv=none; b=dn5FnLaSPETGJFT8M0otM4VwctigHCOxI6lTZDUMNkJOY5GDd9z2KcH5eizRz5sqwjbeWFuiagndcQW6E7RlyjZU0QcyjAMlPyYLJJRULBK+WTztzJy1NbS2VNS2x6IUWhnLP8JP5iezVMwxIw6/C6Yn9Iv0WJFnPu/e22FY2fk= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1704517729; c=relaxed/simple; bh=sfklRqWZpv77AW/FNprnSHewugKtcGAhriMlZEkxERg=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=sF5ku5dxUySMIiR6SeV/patinS0IlizpvArcVZ9y3coW6XeNanH7Qej4K/aG0LimwJZ93qYjpLC76WxPlI4x/PnpZRrPoaykkD2LbL8Pev38XrxWUoMVxgTqo9a1R23FujSTTj+KXBnBdaEEJc2pxzDI4PV0+O40neIASuF55Q4= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from pps.filterd (m0247475.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 4064u04W012140; Sat, 6 Jan 2024 05:08:46 GMT Received: from mxout24.cac.washington.edu (mxout24.cac.washington.edu [140.142.234.158]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3vey2q88bk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 06 Jan 2024 05:08:46 +0000 Received: from smtp.washington.edu (smtp.washington.edu [128.208.60.54]) by mxout24.cac.washington.edu (8.14.4+UW20.07/8.14.4+UW22.04) with ESMTP id 40658gTt025199 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 5 Jan 2024 21:08:42 -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+UW19.10) with ESMTPSA id 406580H7000483 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 5 Jan 2024 21:08:42 -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 v3 2/8] libstdc++: Optimize std::is_const compilation performance Date: Fri, 5 Jan 2024 21:05:36 -0800 Message-ID: <20240106050754.3054782-3-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240106050754.3054782-1-kmatsui@gcc.gnu.org> References: <20231223220432.712093-1-kmatsui@gcc.gnu.org> <20240106050754.3054782-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: 9zxXgn-QcZywOWnFxvRBpjNOlswkvu3J X-Proofpoint-ORIG-GUID: 9zxXgn-QcZywOWnFxvRBpjNOlswkvu3J X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-05_08,2024-01-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 bulkscore=0 malwarescore=0 mlxscore=0 adultscore=0 phishscore=0 clxscore=1034 mlxlogscore=623 lowpriorityscore=0 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401060033 X-Spam-Status: No, score=-12.8 required=5.0 tests=BAYES_00,GIT_PATCH_0,JMQ_SPF_NEUTRAL,KAM_DMARC_STATUS,RCVD_IN_DNSWL_NONE,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::is_const by dispatching to the new __is_const built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_const): Use __is_const built-in trait. (is_const_v): Likewise. Signed-off-by: Ken Matsui --- libstdc++-v3/include/std/type_traits | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 3b1b419bbbb..e64ed1de891 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -835,6 +835,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION // Type properties. /// is_const +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_const) + template + struct is_const + : public __bool_constant<__is_const(_Tp)> + { }; +#else template struct is_const : public false_type { }; @@ -842,6 +848,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template struct is_const<_Tp const> : public true_type { }; +#endif /// is_volatile template @@ -3315,10 +3322,15 @@ template inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; #endif +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_const) +template + inline constexpr bool is_const_v = __is_const(_Tp); +#else template inline constexpr bool is_const_v = false; template inline constexpr bool is_const_v = true; +#endif #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_function) template -- 2.43.0