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 CC69C3858C5F; Fri, 20 Oct 2023 14:12:03 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org CC69C3858C5F 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 CC69C3858C5F 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=1697811125; cv=none; b=uoMdDSVwQLQDViqrWH7Y0rjyAqjzqbxS5AVZy0BG05eKkamhQKamEjbyLNuMrmU+zcvJdWAIFTgbrxOHZFCOfYrlNsugRvtll274bYp0c0Nn2IyomZ7CVl0ZhLIPZy2IhL/iy/IFauBIpeov/nrzsQkrnN6LkEi6dgofYQxOqNU= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1697811125; c=relaxed/simple; bh=/1qcFEm4P/QLiMl/jAKWkbnYQhruObr98IEbIB0r71U=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=f1Gk7RA4y+nkax5c4d0sh+AylwpLZSOew0zTwvOsQkanZJJqV7bz9VNpUza/Y6pOn9RDJiIuSKXYuSF+3ejfCuCwTc6ArEDkYx9waRIqRI9R/7xQOrWIXM1r6V/1pgIvOWFXzbVl9KybJIScmOCdf99Uepu7uUa1R2h6b8xWc8c= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from pps.filterd (m0247479.ppops.net [127.0.0.1]) by mx0a-00641c01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39KE5Wc9012149; Fri, 20 Oct 2023 14:12:03 GMT Received: from mxout25.s.uw.edu (mxout25.s.uw.edu [140.142.234.175]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3tuc8gms8s-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 20 Oct 2023 14:12:02 +0000 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+UW22.04) with ESMTP id 39KE88nl005576 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 20 Oct 2023 07:08:08 -0700 X-Auth-Received: from kmatsui-ThinkPad-X1-Carbon-Gen-9.dhcp4.washington.edu ([10.19.18.191]) (authenticated authid=kmatsui) by smtp.washington.edu (8.16.1+UW21.10/8.14.4+UW19.10) with ESMTPSA id 39KDvqKJ011267 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 20 Oct 2023 07:08:08 -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 v23 05/33] libstdc++: Optimize std::is_const compilation performance Date: Fri, 20 Oct 2023 06:53:24 -0700 Message-ID: <20231020135748.1846670-6-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231020135748.1846670-1-kmatsui@gcc.gnu.org> References: <20231017113822.677344-1-kmatsui@gcc.gnu.org> <20231020135748.1846670-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: ZZiT_yxmw1IzRK9ZxFrdbacW1ztkiJVw X-Proofpoint-ORIG-GUID: ZZiT_yxmw1IzRK9ZxFrdbacW1ztkiJVw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-20_10,2023-10-19_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=766 mlxscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 impostorscore=0 suspectscore=0 phishscore=0 clxscore=1034 lowpriorityscore=0 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2310170001 definitions=main-2310200116 X-Spam-Status: No, score=-13.2 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::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 | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 677cd934b94..686e38e47c3 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -784,6 +784,12 @@ _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 { }; @@ -791,6 +797,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template struct is_const<_Tp const> : public true_type { }; +#endif /// is_volatile template @@ -3218,10 +3225,17 @@ template inline constexpr bool is_compound_v = is_compound<_Tp>::value; template inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; + +#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 + template inline constexpr bool is_volatile_v = false; template -- 2.42.0