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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/114787] [13/14 Regression] wrong code at -O1
 on x86_64-linux-gnu (the generated code hangs)
Date: Wed, 24 Apr 2024 08:13:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114787

--- Comment #16 from GCC 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:cc48418cfc2e555d837ae9138cbfac23acb3cdf9

commit r14-10106-gcc48418cfc2e555d837ae9138cbfac23acb3cdf9
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Apr 24 08:42:40 2024 +0200

    tree-optimization/114787 - more careful loop update with CFG cleanup

    When CFG cleanup removes a backedge we have to be more careful with
    loop update.  In particular we need to clear niter info and estimates
    and if we remove the last backedge of a loop we have to also mark
    it for removal to prevent a following basic block merging to associate
    loop info with an unrelated header.

            PR tree-optimization/114787
            * tree-cfg.cc (remove_edge_and_dominated_blocks): When
            removing a loop backedge clear niter info and when removing
            the last backedge of a loop mark that loop for removal.

            * gcc.dg/torture/pr114787.c: New testcase.=