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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 c++/114480] [12/13/14/15 Regression] g++: internal compiler error: Segmentation fault signal terminated program cc1plus Date: Fri, 17 May 2024 12:29:19 +0000 [thread overview] Message-ID: <bug-114480-4-7OhsQOlCtE@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-114480-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114480 --- Comment #32 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Alexander Monakov <amonakov@gcc.gnu.org>: https://gcc.gnu.org/g:4b9e68a6f3b22800a7f12b58ef6b25e3b339bb3c commit r15-628-g4b9e68a6f3b22800a7f12b58ef6b25e3b339bb3c Author: Alexander Monakov <amonakov@ispras.ru> Date: Wed May 15 16:23:17 2024 +0300 tree-into-ssa: speed up sorting in prune_unused_phi_nodes [PR114480] In PR 114480 we are hitting a case where tree-into-ssa scales quadratically due to prune_unused_phi_nodes doing O(N log N) work for N basic blocks, for each variable individually. Sorting the 'defs' array is especially costly. It is possible to assist gcc_qsort by laying out dfs_out entries in the reverse order in the 'defs' array, starting from its tail. This is not always a win (in fact it flips most of 7-element qsorts in this testcase from 9 comparisons (best case) to 15 (worst case)), but overall it helps on the testcase and on libstdc++ build. On the testcase we go from 1.28e9 comparator invocations to 1.05e9, on libstdc++ from 2.91e6 to 2.84e6. gcc/ChangeLog: PR c++/114480 * tree-into-ssa.cc (prune_unused_phi_nodes): Add dfs_out entries to the 'defs' array in the reverse order.
prev parent reply other threads:[~2024-05-17 12:29 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-03-26 11:40 [Bug c++/114480] New: " douglas.boffey at gmail dot com 2024-03-26 11:42 ` [Bug c++/114480] " douglas.boffey at gmail dot com 2024-03-26 11:46 ` pinskia at gcc dot gnu.org 2024-03-26 11:46 ` pinskia at gcc dot gnu.org 2024-03-26 11:51 ` douglas.boffey at gmail dot com 2024-03-26 12:05 ` pinskia at gcc dot gnu.org 2024-03-26 12:15 ` pinskia at gcc dot gnu.org 2024-03-26 12:26 ` pinskia at gcc dot gnu.org 2024-03-26 12:26 ` pinskia at gcc dot gnu.org 2024-03-26 12:31 ` douglas.boffey at gmail dot com 2024-03-26 12:41 ` redi at gcc dot gnu.org 2024-03-27 8:28 ` rguenth at gcc dot gnu.org 2024-03-27 19:49 ` vmakarov at gcc dot gnu.org 2024-03-28 8:17 ` cvs-commit at gcc dot gnu.org 2024-03-28 8:44 ` rguenth at gcc dot gnu.org 2024-03-28 10:12 ` rguenth at gcc dot gnu.org 2024-03-28 10:39 ` rguenth at gcc dot gnu.org 2024-04-02 13:28 ` rguenth at gcc dot gnu.org 2024-04-03 6:57 ` cvs-commit at gcc dot gnu.org 2024-04-03 11:47 ` rguenth at gcc dot gnu.org 2024-04-04 9:42 ` rguenth at gcc dot gnu.org 2024-04-04 18:41 ` amonakov at gcc dot gnu.org 2024-04-05 15:35 ` amonakov at gcc dot gnu.org 2024-04-08 9:46 ` rguenth at gcc dot gnu.org 2024-04-08 9:50 ` douglas.boffey at gmail dot com 2024-04-08 9:54 ` rguenther at suse dot de 2024-04-08 12:32 ` douglas.boffey at gmail dot com 2024-04-08 13:07 ` rguenther at suse dot de 2024-04-08 13:22 ` [Bug c++/114480] [12/13/14 Regression " rguenth at gcc dot gnu.org 2024-04-08 13:37 ` [Bug c++/114480] [12/13/14 Regression] " rguenth at gcc dot gnu.org 2024-04-09 7:51 ` rguenth at gcc dot gnu.org 2024-04-09 11:39 ` rguenth at gcc dot gnu.org 2024-05-14 13:41 ` [Bug c++/114480] [12/13/14/15 " rguenth at gcc dot gnu.org 2024-05-17 12:29 ` cvs-commit at gcc dot gnu.org [this message]
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