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Subject: [Bug tree-optimization/100923] [9/10 Regression] wrong code at -O2
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Date: Thu, 17 Feb 2022 10:48:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100923

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:a650dc2deb2b6906334c6b06991255f46df93c16

commit r10-10461-ga650dc2deb2b6906334c6b06991255f46df93c16
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Jun 8 12:52:12 2021 +0200

    tree-optimization/100923 - fix alias-ref construction wrt availability

    This PR shows that building an ao_ref from value-numbers is prone to
    expose bogus contextual alias info to the oracle.  The following makes
    sure to construct ao_refs from SSA names available at the program point
    only.

    On the way it modifies the awkward valueize_refs[_1] API.

    2021-06-08  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/100923
            * tree-ssa-sccvn.c (valueize_refs_1): Take a pointer to
            the operand vector to be valueized.
            (valueize_refs): Likewise.
            (valueize_shared_reference_ops_from_ref): Adjust.
            (valueize_shared_reference_ops_from_call): Likewise.
            (vn_reference_lookup_3): Likewise.
            (vn_reference_lookup_pieces): Likewise.  Re-valueize
            with honoring availability when we are about to create
            the ao_ref and valueized before.
            (vn_reference_lookup): Likewise.
            (vn_reference_insert_pieces): Adjust.

            * gcc.dg/torture/pr100923.c: New testcase.

    (cherry picked from commit 7a56d3d3e99cc77ad8a6a674870c814da6225675)=