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[69.118.112.187]) by smtp.gmail.com with ESMTPSA id d5-20020a05620a240500b006a6b1630e95sm4447733qkn.45.2022.06.09.06.00.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jun 2022 06:00:24 -0700 (PDT) To: gcc-patches@gcc.gnu.org Subject: [PATCH 2/1] c++: optimize specialization of templated member functions Date: Thu, 9 Jun 2022 09:00:13 -0400 Message-Id: <20220609130013.250243-1-ppalka@redhat.com> X-Mailer: git-send-email 2.36.1.363.g9c897eef06 In-Reply-To: <20220608182147.4123587-1-ppalka@redhat.com> References: <20220608182147.4123587-1-ppalka@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-14.5 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NONE, 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: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Patrick Palka via Gcc-patches From: Patrick Palka Reply-To: Patrick Palka Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Sender: "Gcc-patches" This performs one of the optimizations added by the previous patch to lookup_template_class, to instantiate_template as well. (For the libstdc++ ranges tests this optimization appears to be effective around 30% of the time, i.e. 30% of the time context of 'tmpl' is non-dependent while the context of 'gen_tmpl' is dependent.) gcc/cp/ChangeLog: * pt.cc (instantiate_template): Don't substitute the context of the most general template if that of the partially instantiated template is non-dependent. --- gcc/cp/pt.cc | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index e021c254872..208daad298a 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -21661,8 +21661,14 @@ instantiate_template (tree tmpl, tree orig_args, tsubst_flags_t complain) ++processing_template_decl; if (DECL_CLASS_SCOPE_P (gen_tmpl)) { - tree ctx = tsubst_aggr_type (DECL_CONTEXT (gen_tmpl), targ_ptr, - complain, gen_tmpl, true); + tree ctx; + if (!uses_template_parms (DECL_CONTEXT (tmpl))) + /* If the context of the partially instantiated template is already + non-dependent, then we might as well use it. */ + ctx = DECL_CONTEXT (tmpl); + else + ctx = tsubst_aggr_type (DECL_CONTEXT (gen_tmpl), targ_ptr, + complain, gen_tmpl, true); push_nested_class (ctx); }