[Bug tree-optimization/103458] [12 Regression] ICE in verify_loop_structure, at cfgloop.c:1736 (error: loop with header 4 not in loop tree) since r12-5301-g045206450386bcd7

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103458

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>:

https://gcc.gnu.org/g:85e91ad55a69282c1b0e34569836a026a1a954d1

commit r12-5572-g85e91ad55a69282c1b0e34569836a026a1a954d1
Author: Richard Biener <rguent...@suse.de>
Date:   Mon Nov 29 09:15:47 2021 +0100

    tree-optimization/103458 - avoid creating new loops in CD-DCE

    When creating forwarders in CD-DCE we have to avoid creating loops
    where we formerly did not consider those because of abnormal
    predecessors.  At this point simply excuse us when there are any
    abnormal predecessors.

    2021-11-29  Richard Biener  <rguent...@suse.de>

            PR tree-optimization/103458
            * tree-ssa-dce.c (make_forwarders_with_degenerate_phis): Do not
            create forwarders for blocks with abnormal predecessors.

            * gcc.dg/torture/pr103458.c: New testcase.