[Bug 265809] clang never finishes on one particular C++ file

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 15 Aug 2022 18:57:59 UTC

John F. Carr <jfc@mit.edu> changed:

           What    |Removed                     |Added
                 CC|                            |jfc@mit.edu

--- Comment #1 from John F. Carr <jfc@mit.edu> ---
The hang (or exponential runtime) appears to be in LLVM's DAGCombiner::Run
working on the function
deriv2eri3_aB_P__0__F__1___TwoPRep_unit__0__P__1___Ab__up_0.  To narrow it down
I ran clang++ -emit-llvm to get an IR file.  That ran quickly.  Then I ran llc
from an LLVM 14 build (it's not installed by default) on that IR file and that
part hung.  The C++ file does not compile with LLVM 15 clang due to changes in
intrinsics.  The LLVM 15 llc program hangs on the output from LLVM 14 clang.

Is anybody in particular responsible for reporting LLVM bugs upstream?

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