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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 tree-optimization/107323] [10 Regression] Loop distribute issue
Date: Thu, 26 Jan 2023 13:05:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107323

--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:95e5c07aa216fe2863ea02e8508a51b5f7528839

commit r10-11178-g95e5c07aa216fe2863ea02e8508a51b5f7528839
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Oct 21 09:45:44 2022 +0200

    tree-optimization/107323 - loop distribution partition ordering issue

    The following reverts part of the PR94125 fix which causes us to
    use a bogus partition ordering after applying versioning for
    alias to the testcase in PR107323.  Instead PR94125 is fixed by
    appropriately considering to be merged SCCs when skipping edges
    we want to ignore because of the alias versioning.

            PR tree-optimization/107323
            * tree-loop-distribution.c (pg_unmark_merged_alias_ddrs):
            New function.
            (loop_distribution::break_alias_scc_partitions): Revert
            postorder save/restore from the PR94125 fix.  Instead
            make sure to not ignore edges from SCCs we are going to
            merge.

            * gcc.dg/tree-ssa/pr107323.c: New testcase.

    (cherry picked from commit 09f9814dc02c161ed78604c6df70b19b596f7524)=