[llvm-bugs] [Bug 44128] New: Abnormal amount of time spent in SelectionDAG::Combine

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44128

            Bug ID: 44128
           Summary: Abnormal amount of time spent in SelectionDAG::Combine
           Product: libraries
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: jonasschievink at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

Created attachment 22860
  --> https://bugs.llvm.org/attachment.cgi?id=22860&action=edit
Reproduction - run with `llc llvm.ll`

The attached LLVM IR (generated by rustc) makes llc spend an unexpectedly long
time (minutes) in SelectionDAG::Combine.

Upstream issue: https://github.com/rust-lang/rust/issues/66595

The IR isn't fully minimized yet, but the file is only a couple dozen lines
regardless.

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