[Bug tree-optimization/94125] [9 Regression] wrong code at -O3 on x86_64-linux-gnu

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94125

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Bin Cheng <amker@gcc.gnu.org>:

https://gcc.gnu.org/g:95c969e58f7905b14d3f2889cf41595eb2c13cbb

commit r9-8411-g95c969e58f7905b14d3f2889cf41595eb2c13cbb
Author: Bin Cheng <bin.cheng@linux.alibaba.com>
Date:   Tue Mar 24 17:40:21 2020 +0800

    backport PR94125: Update post order number for merged SCC.

    Function loop_distribution::break_alias_scc_partitions needs to compute
    SCC with runtime alias edges skipped.  As a result, partitions could be
    re-assigned larger post order number than SCC's precedent partition and
    distributed before the precedent one.  This fixes the issue by updating
    the merged partition to the minimal post order in SCC.

    Backport from mainline.
        PR tree-optimization/94125
        * tree-loop-distribution.c
        (loop_distribution::break_alias_scc_partitions): Update post order
        number for merged scc.

        * gcc.dg/tree-ssa/pr94125.c: New test.