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Subject: [Bug tree-optimization/102893] [9/10/11/12 Regression] CDDCE does
 not detect empty infinite nested loops
Date: Fri, 22 Oct 2021 11:43:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102893

--- Comment #2 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:c2a9a98a369528c8689ecb68db576f8e7dc2fa45

commit r12-4627-gc2a9a98a369528c8689ecb68db576f8e7dc2fa45
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Oct 22 12:45:32 2021 +0200

    tree-optimization/102893 - properly DCE empty loops inside infinite loo=
ps

    The following fixes the test for an exit edge I put in place for
    the fix for PR45178 where I somehow misunderstood how the cyclic
    list works.

    2021-10-22  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/102893
            * tree-ssa-dce.c (find_obviously_necessary_stmts): Fix the
            test for an exit edge.

            * gcc.dg/tree-ssa/ssa-dce-9.c: New testcase.=