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Subject: [Bug tree-optimization/102436] [11/12 Regression] Lost Load/Store
 Motion
Date: Fri, 19 Nov 2021 08:35:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102436

--- 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:0fc859f5efcb4624a8b4ffdbf34d63972af179a8

commit r12-5394-g0fc859f5efcb4624a8b4ffdbf34d63972af179a8
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Nov 18 13:40:32 2021 +0100

    tree-optimization/102436 - restore loop store motion

    This restores a case of conditional store motion we fail to handle
    after the rewrite.  We can recognize the special case of all
    stores in a loop happening in a single conditionally executed
    block which ensures stores are not re-ordered by executing them
    in different loop iterations.  Separating out the case avoids
    complicating the already complex main path.

    2021-11-18  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/102436
            * tree-ssa-loop-im.c (execute_sm_if_changed): Add mode
            to just create the if structure and return the then block.
            (execute_sm): Add flag to indicate the var will re-use
            another flag var.
            (hoist_memory_references): Support a single conditional
            block with all stores as special case.

            * gcc.dg/torture/20211118-1.c: New testcase.
            * gcc.dg/tree-ssa/ssa-lim-18.c: Likewise.=