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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/106892] [11/12 Regression] Wrong code at -O3 on
 x86_64-linux-gnu since r11-963-g80d6f89e78fc3b77
Date: Tue, 11 Oct 2022 12:06:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106892

--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:2b9e1f7ff476059724cca4b11d39972655d4468f

commit r12-8819-g2b9e1f7ff476059724cca4b11d39972655d4468f
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Sep 9 12:06:38 2022 +0200

    tree-optimization/106892 - avoid invalid pointer association in predcom

    When predictive commoning builds a reference for iteration N it
    prematurely associates a constant offset into the MEM_REF offset
    operand which can be invalid if the base pointer then points
    outside of an object which alias-analysis does not consider valid.

            PR tree-optimization/106892
            * tree-predcom.cc (ref_at_iteration): Do not associate the
            constant part of the offset into the MEM_REF offset
            operand, across a non-zero offset.

            * gcc.dg/torture/pr106892.c: New testcase.

    (cherry picked from commit a8b0b13da7379feb31950a9d2ad74b98a29c547f)=