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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/100923] [9 Regression] wrong code at -O2 and
 above on x86_64-linux-gnu
Date: Mon, 06 May 2024 13:12:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100923

--- Comment #11 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:7c469a9fc785505dc350aba60311812c2bb0c1b5

commit r15-204-g7c469a9fc785505dc350aba60311812c2bb0c1b5
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Feb 28 10:08:31 2024 +0100

    tree-optimization/100923 - re-do VN with contextual PTA info fix

    The following implements the gist of the PR100923 fix in a leaner
    (and more complete) way by realizing that all ao_ref_init_from_vn_refer=
ence
    uses need to have an SSA name in the base valueized with availability
    in mind.  Instead of re-valueizing the whole chain of operands we can
    simply only and always valueize the SSA name we put in the base.

    This handles also two omitted places in vn_reference_lookup_3.

            PR tree-optimization/100923
            * tree-ssa-sccvn.cc (ao_ref_init_from_vn_reference): Valueize
            base SSA_NAME.
            (vn_reference_lookup_3): Adjust vn_context_bb around calls
            to ao_ref_init_from_vn_reference.
            (vn_reference_lookup_pieces): Revert original PR100923 fix.
            (vn_reference_lookup): Likewise.=