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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/106131] [10 Regression] -fstrict-aliasing
 breaks normal program that does not use any pointer or reference
Date: Fri, 14 Oct 2022 10:47:35 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: alias, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106131

--- 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:a8abbf6d15fefe5ac27aa7c21201883b66cc9b01

commit r10-11036-ga8abbf6d15fefe5ac27aa7c21201883b66cc9b01
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jun 30 10:33:40 2022 +0200

    tree-optimization/106131 - wrong code with FRE rewriting

    The following makes sure to not use the original TBAA type for
    looking up a value across an aggregate copy when we had to offset
    the read.

    2022-06-30  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/106131
            * tree-ssa-sccvn.c (vn_reference_lookup_3): Force alias-set
            zero when offsetting the read looking through an aggregate
            copy.

            * g++.dg/torture/pr106131.C: New testcase.

    (cherry picked from commit 9701432ff79926a5dd3303be3417e0bd0c24140b)=