[Bug middle-end/106892] [11/12/13 Regression] Wrong code at -O3 on x86_64-linux-gnu since r11-963-g80d6f89e78fc3b77

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106892

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:a8b0b13da7379feb31950a9d2ad74b98a29c547f

commit r13-2560-ga8b0b13da7379feb31950a9d2ad74b98a29c547f
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Sep 9 12:06:38 2022 +0200

    tree-optimization/106722 - 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/106722
            * 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.