[Bug tree-optimization/112281] [12/13 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-2097-g9f34b780b0461e

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112281

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

https://gcc.gnu.org/g:0b409fc34e9b1ff7f90456e73128e38970c1532b

commit r13-8720-g0b409fc34e9b1ff7f90456e73128e38970c1532b
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Nov 20 13:39:52 2023 +0100

    tree-optimization/112281 - loop distribution and zero dependence distances

    The following fixes an omission in dependence testing for loop
    distribution.  When the overall dependence distance is not zero but
    the dependence direction in the innermost common loop is = there is
    a conflict between the partitions and we have to merge them.

            PR tree-optimization/112281
            * tree-loop-distribution.cc
            (loop_distribution::pg_add_dependence_edges): For = in the
            innermost common loop record a partition conflict.

            * gcc.dg/torture/pr112281-1.c: New testcase.
            * gcc.dg/torture/pr112281-2.c: Likewise.

    (cherry picked from commit 3b34902417259031823bff7f853f615a60464bbd)