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Subject: [Bug tree-optimization/100934] [9 Regression] wrong code at -O3
 during unrolling since r9-6299
Date: Wed, 13 Oct 2021 10:09:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100934

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:e89b09601907f3f3ba6c988ebef7b978af40b83a

commit r9-9769-ge89b09601907f3f3ba6c988ebef7b978af40b83a
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jun 14 14:57:26 2021 +0200

    tree-optimization/100934 - properly mark irreducible regions for DOM

    The jump threading code requires marked irreducible regions for the
    purpose of validating jump threading paths but DOM fails to provide
    that resulting in mised number of iteration upper bounds clearing.

    2021-06-14  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/100934
            * tree-ssa-dom.c (pass_dominator::execute): Properly
            mark irreducible regions.

            * gcc.dg/torture/pr100934.c: New testcase.

    (cherry picked from commit 788bb7edb3975b80c4cb16323e7a5e55a2471e46)=