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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/111294] [14 Regression] Missed Dead Code
 Elimination since  r14-573-g69f1a8af45d
Date: Mon, 18 Sep 2023 08:56:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111294

--- Comment #12 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:d45ddc2c04e471d0dcee016b6edacc00b8341b16

commit r14-4089-gd45ddc2c04e471d0dcee016b6edacc00b8341b16
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Sep 14 13:06:51 2023 +0200

    tree-optimization/111294 - backwards threader PHI costing

    This revives an earlier patch since the problematic code applying
    extra costs to PHIs in copied blocks we couldn't make any sense of
    prevents a required threading in this case.  Instead of coming up
    with an artificial other costing the following simply removes the
    bits.

    As with all threading changes this requires a plethora of testsuite
    adjustments, but only the last three are unfortunate as is the
    libgomp team.c adjustment which is required to avoid a bogus -Werror
    diagnostic during bootstrap.

            PR tree-optimization/111294
    gcc/
            * tree-ssa-threadbackward.cc (back_threader_profitability::m_na=
me):
            Remove
            (back_threader::find_paths_to_names): Adjust.
            (back_threader::maybe_thread_block): Likewise.
            (back_threader_profitability::possibly_profitable_path_p): Remo=
ve
            code applying extra costs to copies PHIs.

    libgomp/
            * team.c (gomp_team_start): Assert alloca size to avoid false
            positive alloc-size diagnostic.

    gcc/testsuite/
            * gcc.dg/tree-ssa/pr111294.c: New test.
            * gcc.dg/tree-ssa/phi_on_compare-4.c: Adjust.
            * gcc.dg/tree-ssa/pr59597.c: Likewise.
            * gcc.dg/tree-ssa/pr61839_2.c: Likewise.
            * gcc.dg/tree-ssa/ssa-sink-18.c: Likewise.
            * g++.dg/warn/Wstringop-overflow-4.C: XFAIL subtest on ilp32.
            * gcc.dg/uninit-pred-9_b.c: XFAIL subtest everywhere.
            * gcc.dg/vect/vect-117.c: Make scan for not Invalid sum
            conditional on lp64.=