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Tue, 10 Oct 2023 22:41:31 GMT Received: from mxout23.cac.washington.edu (mxout23.cac.washington.edu [140.142.32.140]) by mx0a-00641c01.pphosted.com (PPS) with ESMTPS id 3tnam9ukma-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Oct 2023 22:41:30 +0000 Received: from smtp.washington.edu (smtp.washington.edu [140.142.234.157]) by mxout23.cac.washington.edu (8.14.4+UW20.07/8.14.4+UW22.04) with ESMTP id 39AMfB0c019908 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 10 Oct 2023 15:41:11 -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 39AMFOUq024596 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Oct 2023 15:41:11 -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 v16 39/39] libstdc++: Optimize is_scalar trait performance Date: Tue, 10 Oct 2023 15:10:30 -0700 Message-ID: <20231010221520.3680267-40-kmatsui@gcc.gnu.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231010221520.3680267-1-kmatsui@gcc.gnu.org> References: <20231010095229.3364786-1-kmatsui@gcc.gnu.org> <20231010221520.3680267-1-kmatsui@gcc.gnu.org> MIME-Version: 1.0 X-Proofpoint-GUID: _g0RxOpFEUoCoEb0UoQGJ8T6m39SEQJA X-Proofpoint-ORIG-GUID: _g0RxOpFEUoCoEb0UoQGJ8T6m39SEQJA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-10_19,2023-10-10_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=548 phishscore=0 spamscore=0 suspectscore=0 bulkscore=0 mlxscore=0 impostorscore=0 clxscore=1034 lowpriorityscore=0 malwarescore=0 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310100175 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 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+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1776997480812710190 X-GMAIL-MSGID: 1779411196752415604 This patch optimizes the performance of the is_scalar trait by dispatching to the new __is_scalar built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_scalar): Use __is_scalar built-in trait. (is_scalar_v): Likewise. Signed-off-by: Ken Matsui --- libstdc++-v3/include/std/type_traits | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 7e93923f44b..eb16a642575 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -775,11 +775,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct is_member_pointer; /// is_scalar +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scalar) + template + struct is_scalar + : public __bool_constant<__is_scalar(_Tp)> + { }; +#else template struct is_scalar : public __or_, is_enum<_Tp>, is_pointer<_Tp>, is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type { }; +#endif /// is_compound template @@ -3398,8 +3405,14 @@ template inline constexpr bool is_object_v = is_object<_Tp>::value; #endif +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scalar) +template + inline constexpr bool is_scalar_v = __is_scalar(_Tp); +#else template inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; +#endif + template inline constexpr bool is_compound_v = !is_fundamental_v<_Tp>;