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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/107107] [10 Regression] Wrong codegen from
 TBAA when stores to distinct same-mode types are collapsed?
Date: Thu, 26 Jan 2023 13:05:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107107

--- 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:58e39fcaaf298ff54b6f1a45fa9d15390e8113fb

commit r10-11177-g58e39fcaaf298ff54b6f1a45fa9d15390e8113fb
Author: Richard Biener <rguenther@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)=