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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111878] [14 Regression] ICE: in
 get_loop_exit_edges, at cfgloop.cc:1204 with -O3 -fgraphite-identity
 -fsave-optimization-record/-fdump-tree-graphite/-fopt-info since
 r14-4708-gd65e38e616e7ac
Date: Tue, 31 Oct 2023 11:09:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111878

Tamar Christina <tnfchris at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |tnfchris at gcc dot=
 gnu.org

--- Comment #7 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Thanks for the report.

Graphite is feeding it a junk loop.  The loop's latch block is invalid. In =
fact
the block isn't even part of the loop.

Since the loop structure Graphite passes it is broken, get_loop_exit_edges =
(..)
asserts.

Previously for this situation the call would silently return NULL for such
loops.
I'd argue this is a bug in Graphite, but will restore the return NULL for
broken loops.=