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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/95638] [10/11 Regression] Legit-looking code doesn't work with -O2 Date: Sun, 14 Jun 2020 00:47:08 +0000 [thread overview] Message-ID: <bug-95638-4-u69Dg2pyZz@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-95638-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638 --- Comment #6 from bin cheng <amker at gcc dot gnu.org> --- We call graphds_scc twice to break alias dependence, with alias dependence edges skipped in the second call. The code (both before and after r10-7184-ge4e9a59105a81cdd6c1328b0a5ed9fe4cc82840e) tries to rectify post order information after the second call, however it never gets it right. Actually I don't think it can be easily rectified (if possible). Will test another patch which records/restores post order information for the second call.
next prev parent reply other threads:[~2020-06-14 0:47 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-11 11:45 [Bug c++/95638] New: " officesamurai at gmail dot com 2020-06-11 12:08 ` [Bug c++/95638] " jakub at gcc dot gnu.org 2020-06-11 12:12 ` marxin at gcc dot gnu.org 2020-06-11 12:23 ` jakub at gcc dot gnu.org 2020-06-11 15:40 ` redi at gcc dot gnu.org 2020-06-12 1:17 ` amker at gcc dot gnu.org 2020-06-12 7:20 ` [Bug c++/95638] [10/11 Regression] " rguenth at gcc dot gnu.org 2020-06-14 0:47 ` amker at gcc dot gnu.org [this message] 2020-06-20 7:56 ` [Bug tree-optimization/95638] " cvs-commit at gcc dot gnu.org 2020-06-29 10:07 ` jakub at gcc dot gnu.org 2020-06-29 12:10 ` amker at gcc dot gnu.org 2020-07-09 11:47 ` rguenth at gcc dot gnu.org 2020-07-09 11:48 ` [Bug tree-optimization/95638] [10 " rguenth at gcc dot gnu.org 2020-07-10 3:59 ` cvs-commit at gcc dot gnu.org 2020-07-10 4:12 ` cvs-commit at gcc dot gnu.org 2020-07-23 6:51 ` rguenth at gcc dot gnu.org 2020-07-23 7:11 ` amker at gcc dot gnu.org 2021-03-27 2:44 ` amker at gcc dot gnu.org
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