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From: "slyfox at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/107196] [13 Regression] llvm-14.0.6 is miscompiles by
 gcc-13 in -O3: hangs llvm testsuite (inliner seems to break it)
Date: Fri, 21 Oct 2022 06:26:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107196

--- Comment #8 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
I confirm that today's master does not exhibit the failure. Bisecting to the
fix ends up at this fix:

  commit c9b840db504d15db01f06fe1fec38282dbafee07
  Author: Aldy Hernandez <aldyh@redhat.com>
  Date:   Mon Oct 17 18:56:24 2022 +0200

    Make sure exported range for SSA post-dominates the DEF in
set_global_ranges_from_unreachable_edges.

    The problem here is that we're exporting a range for an SSA range that
    happens on the other side of a __builtin_unreachable, but the SSA does
    not post-dominate the definition point.  This is causing ivcanon to
    unroll things incorrectly.

    This was a snafu when converting the code from evrp.

            PR tree-optimization/107293

Looks plausible?=