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Subject: [Bug tree-optimization/101088] [12 Regression] ICE in
 sm_seq_valid_bb, at tree-ssa-loop-im.c:2383
Date: Wed, 16 Jun 2021 10:16:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101088

--- Comment #3 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:43fc4234ad3d9302d3460385b6fdb5e3f59b6986

commit r12-1526-g43fc4234ad3d9302d3460385b6fdb5e3f59b6986
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Jun 16 09:49:18 2021 +0200

    tree-optimization/101088 - fix SM invalidation issue

    When we face a sm_ord vs sm_unord for the same ref during
    store sequence merging we assert that the ref is already marked
    unsupported.  But it can be that it will only be marked so
    during the ongoing merging so instead of asserting mark it here.

    Also apply some optimization to not waste resources to search
    for already unsupported refs.

    2021-06-16  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/101088
            * tree-ssa-loop-im.c (sm_seq_valid_bb): Only look for
            supported refs on edges.  Do not assert same ref but
            different kind stores are unsuported but mark them so.
            (hoist_memory_references): Only look for supported refs
            on exits.

            * gcc.dg/torture/pr101088.c: New testcase.=