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Subject: [Bug tree-optimization/107699] [12/13 Regression] False positive
 -Warray-bounds, non-existent offset reported by GCC
Date: Thu, 08 Dec 2022 10:58:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107699

--- 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:892e8c520be37d0a0f14e2ae375103c5303ed549

commit r13-4555-g892e8c520be37d0a0f14e2ae375103c5303ed549
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Dec 8 09:07:36 2022 +0100

    tree-optimization/107699 - missed &data._M_elems + _1 !=3D &data._M_ele=
ms
folding

    The following addresses a missed folding noticed in PR107699 that can
    be fixed amending the existing &x + a !=3D &x + b pattern to also handle
    the case of only one side having a pointer plus.  I'm moving the
    patterns next to related simpifications showing there'd be an existing
    pattern matching this if it were not gated with an explicit single_use
    constraint.  Note the new pattern also handles &x.a + a !=3D &x.b, but
    this hints at some unification / generalization opportunities here.

            PR tree-optimization/107699
            * match.pd (&a !=3D/=3D=3D &a.b + c -> (&a - &a.b) !=3D/=3D=3D =
c): New
            pattern variant.

            * gcc.dg/tree-ssa/pr107699.c: New testcase.=