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Subject: [Bug tree-optimization/101394] [9/10/11 Regression] ICE on valid
 code with -O2: SSA corruption: Unable to coalesce ssa_names 10 and 19 which
 are marked as MUST COALESCE.
Date: Tue, 13 Jul 2021 10:59:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101394

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:7d060844c0de1ed65da84374cae6fa1598011f4a

commit r11-8724-g7d060844c0de1ed65da84374cae6fa1598011f4a
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jul 12 10:49:03 2021 +0200

    tree-optimization/101394 - fix PRE full redundancy wrt abnormals

    This avoids adding a copy from an abnormal picked up from PHI
    translation much like we'd avoid inserting the translated
    expression on pred edges.

    2021-07-12  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/101394
            * tree-ssa-pre.c (do_pre_regular_insertion): Avoid inserting
            copies from abnormals for a full redundancy.

            * gcc.dg/torture/pr101394.c: New testcase.

    (cherry picked from commit 92343e0ba4d47f21ae20ffcb83d736bdbc15dae0)=