[Bug tree-optimization/107323] [10/11 Regression] Loop distribute issue

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107323

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:28fe903730d2c6e424732184ab2d8b1e7d46db6c

commit r11-10482-g28fe903730d2c6e424732184ab2d8b1e7d46db6c
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)