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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/103755] {has,use}_facet() and iostream constructor performance Date: Fri, 21 Apr 2023 15:01:29 +0000 [thread overview] Message-ID: <bug-103755-4-oE6pfvKxvY@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-103755-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103755 --- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>: https://gcc.gnu.org/g:8caf5805ad76125b84430b8653003f4776489d46 commit r12-9462-g8caf5805ad76125b84430b8653003f4776489d46 Author: Jonathan Wakely <jwakely@redhat.com> Date: Thu Apr 20 21:02:22 2023 +0100 libstdc++: Optimize std::try_facet and std::use_facet [PR103755] The std::try_facet and std::use_facet functions were optimized in r13-3888-gb3ac43a3c05744 to avoid redundant checking for all facets that are required to always be present in every locale. This performs a simpler version of the optimization that only applies to std::ctype<char>, std::num_get<char>, std::num_put<char>, and the wchar_t specializations of those facets. Those are the facets that are cached by std::basic_ios, which means they're used on construction for every iostream object. This smaller change is suitable for the gcc-12 branch, and mitigates the performance loss for powerpc64le-linux on the gcc-12 branch caused by r12-9454-g24cf9f4c6f45f7 for PR 103387. It also greatly improves the performance of constructing iostreams objects, for all targets. libstdc++-v3/ChangeLog: PR libstdc++/103755 * include/bits/locale_classes.tcc (try_facet, use_facet): Do not check array index or dynamic type when accessing required specializations of std::ctype, std::num_get, or std::num_put. * testsuite/22_locale/ctype/is/string/89728_neg.cc: Adjust expected errors.
next prev parent reply other threads:[~2023-04-21 15:01 UTC|newest] Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-17 3:49 [Bug libstdc++/103755] New: " dprokoptsev at gmail dot com 2021-12-17 10:31 ` [Bug libstdc++/103755] " redi at gcc dot gnu.org 2021-12-17 17:22 ` redi at gcc dot gnu.org 2021-12-17 17:52 ` redi at gcc dot gnu.org 2021-12-17 21:05 ` redi at gcc dot gnu.org 2021-12-19 3:41 ` dprokoptsev at gmail dot com 2021-12-19 3:44 ` dprokoptsev at gmail dot com 2021-12-19 13:04 ` redi at gcc dot gnu.org 2022-02-03 17:06 ` redi at gcc dot gnu.org 2022-09-23 12:57 ` redi at gcc dot gnu.org 2022-11-11 5:29 ` cvs-commit at gcc dot gnu.org 2022-11-11 13:27 ` redi at gcc dot gnu.org 2022-11-11 21:54 ` seurer at gcc dot gnu.org 2022-11-11 21:55 ` redi at gcc dot gnu.org 2022-11-11 22:39 ` redi at gcc dot gnu.org 2022-11-12 1:30 ` cvs-commit at gcc dot gnu.org 2022-11-12 2:00 ` redi at gcc dot gnu.org 2023-01-06 12:12 ` redi at gcc dot gnu.org 2023-01-11 14:07 ` redi at gcc dot gnu.org 2023-04-21 15:01 ` cvs-commit at gcc dot gnu.org [this message] 2023-04-21 15:06 ` redi at gcc dot gnu.org
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