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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/111519] [13/14 Regression] Wrong code at -O3
 on x86_64-linux-gnu since r13-455-g1fe04c497d
Date: Wed, 11 Oct 2023 07:23:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111519

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:16a4df27436c8f594a784028591dd3e47cabe5c0

commit r13-7944-g16a4df27436c8f594a784028591dd3e47cabe5c0
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Oct 11 08:58:29 2023 +0200

    tree-ssa-strlen: optimization skips clobbering store [PR111519]

    The following testcase is miscompiled, because count_nonzero_bytes
incorrectly
    uses get_strinfo information on a pointer from which an earlier instruc=
tion
    loads SSA_NAME stored at the current instruction.  get_strinfo shows a
state
    right before the current store though, so if there are some stores in
between
    the current store and the load, the string length information might have
    changed.

    The patch passes around gimple_vuse from the store and punts instead of
using
    strinfo on loads from MEM_REF which have different gimple_vuse from tha=
t.

    2023-10-11  Richard Biener  <rguenther@suse.de>
                Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/111519
            * tree-ssa-strlen.cc (strlen_pass::count_nonzero_bytes): Add vu=
se
            argument and pass it through to recursive calls and
            count_nonzero_bytes_addr calls.  Don't shadow the stmt argument,
but
            change stmt for gimple_assign_single_p statements for which we
don't
            immediately punt.
            (strlen_pass::count_nonzero_bytes_addr): Add vuse argument and =
pass
            it through to recursive calls and count_nonzero_bytes calls.  D=
on't
            use get_strinfo if gimple_vuse (stmt) is different from vuse.=20
Don't
            shadow the stmt argument.

            * gcc.dg/torture/pr111519.c: New testcase.

    (cherry picked from commit e75bf1985fdc9a5d3a307882a9251d8fd6e93def)=