https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64359
Bug ID: 64359 Summary: [5 Regression] alias_template_specialization_p & template_args_equal show up high in profile Product: gcc Version: 5.0 Status: UNCONFIRMED Keywords: compile-time-hog Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: trippels at gcc dot gnu.org CC: jason at gcc dot gnu.org Running "perf top", while building the Chromium browser, shows: 11.76% cc1plus [.] alias_template_specialization_p 11.12% cc1plus [.] template_args_equal 5.16% cc1plus [.] structural_comptypes 4.38% cc1plus [.] any_dependent_template_arguments_p 2.48% cc1plus [.] lookup_template_class_1 1.61% [kernel] [k] clear_page_c 1.36% cc1plus [.] make_node_stat 1.19% cc1plus [.] retrieve_specialization 1.14% cc1plus [.] push_to_top_level 1.07% cc1plus [.] walk_tree_1 This probably started with r217250 aka DR 1558.