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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/106293] [13 Regression] 456.hmmer at -Ofast
 -march=native regressed by 19% on zen2 and zen3 in July 2022
Date: Tue, 10 Jan 2023 15:53:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106293

--- Comment #8 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:4e0b504f26f78ff02e80ad98ebbf8ded3aa6ffa1

commit r13-5092-g4e0b504f26f78ff02e80ad98ebbf8ded3aa6ffa1
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Jan 10 13:48:51 2023 +0100

    tree-optimization/106293 - missed DSE with virtual LC PHI

    Degenerate virtual PHIs can break DSEs fragile heuristic as to what
    defs it can handle for further processing.  The following enhances
    it to look through degenerate PHIs by means of a worklist, processing
    the degenerate PHI defs uses to the defs array.  The rewrite of
    virtuals into loop-closed SSA caused this to issue appear more often.
    The patch itself is mostly re-indenting the new loop body.

            PR tree-optimization/106293
            * tree-ssa-dse.cc (dse_classify_store): Use a worklist to
            process degenerate PHI defs.

            * gcc.dg/tree-ssa/ssa-dse-46.c: New testcase.=