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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110298] [10/11/12 Regression] ICE at -Os on
 x86_64-linux-gnu since r10-840
Date: Fri, 23 Jun 2023 11:30:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110298

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:c409f2a1cc5d5bffe2fb93454924ae402c57f8f6

commit r12-9723-gc409f2a1cc5d5bffe2fb93454924ae402c57f8f6
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jun 19 09:52:45 2023 +0200

    tree-optimization/110298 - CFG cleanup and stale nb_iterations

    When unrolling we eventually kill nb_iterations info since it may
    refer to removed SSA names.  But we do this only after cleaning
    up the CFG which in turn can end up accessing it.  Fixed by
    swapping the two.

            PR tree-optimization/110298
            * tree-ssa-loop-ivcanon.cc (tree_unroll_loops_completely):
            Clear number of iterations info before cleaning up the CFG.

            * gcc.dg/torture/pr110298.c: New testcase.

    (cherry picked from commit 916add3bf6e46467e4391e358b11ecfbc4daa275)=