[Bug target/111591] ppc64be: miscompilation with -mstrict-align / -O3

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111591

--- Comment #33 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:97094d2ffd7d00261e6d7cc5d4a62dc7c2c89b64

commit r14-6481-g97094d2ffd7d00261e6d7cc5d4a62dc7c2c89b64
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Dec 13 08:54:49 2023 +0100

    middle-end/111591 - explain why TBAA doesn't need adjustment

    While tidying the prototype patch I've done for the reduced testcase
    in PR111591 and in that process trying to produce a testcase that
    is miscompiled by stack slot coalescing and the TBAA info that
    remains un-altered I've realized we do not need to adjust TBAA info.

    The following documents this in the place we adjust points-to info
    which we do need to adjust.

            PR middle-end/111591
            * cfgexpand.cc (update_alias_info_with_stack_vars): Document
            why not adjusting TBAA info on accesses is OK.