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Subject: [Bug tree-optimization/100934] [9/10 Regression] wrong code at -O3
 during unrolling since r9-6299
Date: Wed, 16 Jun 2021 14:24:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100934

--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:b7878d4e179c72ad69cdd103fbbfe16bc38010db

commit r10-9924-gb7878d4e179c72ad69cdd103fbbfe16bc38010db
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)=