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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/84646] Missed optimisation for hoisting
 conditions outside nested loops
Date: Thu, 10 Nov 2022 13:13:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D84646

--- 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:203b127fccc9abe5373c9e3cc03a476c35b1f594

commit r13-3877-g203b127fccc9abe5373c9e3cc03a476c35b1f594
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Nov 10 14:08:35 2022 +0100

    Restore CCP copy propagation

    The following restores copy propagation in CCP for the case the
    lattice was constant before trying to transition to a copy.  At
    some point we changed to use the meet operator to handle
    integer constant -> integer constant transitions but that screws
    up the const -> copy lattice transition.

            PR tree-optimization/84646
            * tree-ssa-ccp.cc (set_lattice_value): Make sure we
            allow a const -> copy transition and avoid using meet
            in that case.

            * gcc.dg/tree-ssa/ssa-ccp-42.c: New testcase.=