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Sat, 06 Jan 2024 05:09:05 +0000 Received: from smtp.washington.edu (smtp.washington.edu [128.208.60.54]) by mxout21.s.uw.edu (8.14.4+UW20.07/8.14.4+UW22.04) with ESMTP id 40658gYM014358 (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 406580H9000483 (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 4/8] libstdc++: Optimize std::is_volatile compilation performance Date: Fri, 5 Jan 2024 21:05:38 -0800 Message-ID: <20240106050754.3054782-5-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 X-Proofpoint-GUID: ndApwCT9jtj-RC6mRiMKM5Fg6juLH0lo X-Proofpoint-ORIG-GUID: ndApwCT9jtj-RC6mRiMKM5Fg6juLH0lo 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 mlxscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 malwarescore=0 impostorscore=0 spamscore=0 adultscore=0 priorityscore=1501 clxscore=1034 bulkscore=0 mlxlogscore=703 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_H2, 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+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786112126491765165 X-GMAIL-MSGID: 1787316484900414496 This patch optimizes the compilation performance of std::is_volatile by dispatching to the new __is_volatile built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_volatile): Use __is_volatile built-in trait. (is_volatile_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 e64ed1de891..2bfc31b141d 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -851,6 +851,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION #endif /// is_volatile +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_volatile) + template + struct is_volatile + : public __bool_constant<__is_volatile(_Tp)> + { }; +#else template struct is_volatile : public false_type { }; @@ -858,6 +864,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template struct is_volatile<_Tp volatile> : public true_type { }; +#endif /// is_trivial template @@ -3344,10 +3351,15 @@ template inline constexpr bool is_function_v<_Tp&&> = false; #endif +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_volatile) +template + inline constexpr bool is_volatile_v = __is_volatile(_Tp); +#else template inline constexpr bool is_volatile_v = false; template inline constexpr bool is_volatile_v = true; +#endif template inline constexpr bool is_trivial_v = __is_trivial(_Tp);