[Bug tree-optimization/107107] [10 Regression] Wrong codegen from TBAA when stores to distinct same-mode types are collapsed?

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107107

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

https://gcc.gnu.org/g:58e39fcaaf298ff54b6f1a45fa9d15390e8113fb

commit r10-11177-g58e39fcaaf298ff54b6f1a45fa9d15390e8113fb
Author: Richard Biener <rguent...@suse.de>
Date:   Thu Oct 6 11:20:16 2022 +0200

    tree-optimization/107107 - tail-merging VN wrong-code

    The following fixes an unintended(?) side-effect of the special
    MODIFY_EXPR expression entries we add for tail-merging during VN.
    We shouldn't value-number the virtual operand differently here.

            PR tree-optimization/107107
            * tree-ssa-sccvn.c (visit_reference_op_store): Do not
            affect value-numbering when doing the tail merging
            MODIFY_EXPR lookup.

            * gcc.dg/pr107107.c: New testcase.

    (cherry picked from commit 85333b9265720fc4e49397301cb16324d2b89aa7)