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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/110243] [13/14 Regression] Wrong code at -O3
 on x86_64-linux-gnu since r13-3875-g9e11ceef165
Date: Fri, 20 Oct 2023 13:15:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110243

--- Comment #9 from CVS 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:44e7e4498c3cdc27e087ab80aa76dac41819702f

commit r14-4789-g44e7e4498c3cdc27e087ab80aa76dac41819702f
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Oct 20 14:08:46 2023 +0200

    tree-optimization/110243 - IVOPTs introducing undefined overflow

    The following addresses IVOPTs rewriting expressions in its
    strip_offset without caring for definedness of overflow.  Rather
    than the earlier attempt of just using the proper
    split_constant_offset from data-ref analysis the following adjusts
    IVOPTs helper trying to minimize changes from this fix, possibly
    easing backports.

            PR tree-optimization/110243
            PR tree-optimization/111336
            * tree-ssa-loop-ivopts.cc (strip_offset_1): Rewrite
            operations with undefined behavior on overflow to
            unsigned arithmetic.

            * gcc.dg/torture/pr110243.c: New testcase.
            * gcc.dg/torture/pr111336.c: Likewise.=