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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/109342] [13 Regression] Wrong code with -O2
 since r13-5348-gc29d85359add80
Date: Thu, 30 Mar 2023 11:02:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109342

--- Comment #4 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:1d0ba4467dd9cad11eb9ff547442e3ce6292b892

commit r13-6942-g1d0ba4467dd9cad11eb9ff547442e3ce6292b892
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Mar 30 11:32:19 2023 +0200

    tree-optimization/109342 - wrong code with edge equivalences in VN

    The following testcase shows a problem in how we query valitity for
    equivalences on edges when the edge is a backedge and thus refering
    to a block thats later in the iteration order we use for VN.  That
    causes the dominated_by_p_w_unex helper to look at edge executable
    state that's not yet computed and thus still at optimistic not
    executable state.

    The following makes sure to use a plain dominance check in these cases.

            PR tree-optimization/109342
            * tree-ssa-sccvn.cc (vn_nary_op_get_predicated_value): New
            overload for edge.  When that edge is a backedge use
            dominated_by_p directly.

            * g++.dg/torture/pr109342.C: New testcase.=