[llvm-bugs] [Bug 44245] New: [InstCombine] Infinite loop in a bitcode generated by rustc

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44245

            Bug ID: 44245
           Summary: [InstCombine] Infinite loop in a bitcode generated by
                    rustc
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: phosek at chromium.org
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 22917
  --> https://bugs.llvm.org/attachment.cgi?id=22917&action=edit
bitcode reproducer (reduced with bugpoint)

We're seeing what appears to be an infinite loop when running instcombine on a
bitcode file generated by rustc (the related Rust issue is
https://github.com/rust-lang/rust/issues/66036).

We've managed to create a reproducer and then further reduce it by using
bugpoint. This behavior can be reproduced by simply running:

  opt -instcombine bugpoint-reduced-simplified.bc -o out

We've tried all the version from trunk to 6.0 and it reproduces with all of
them so this doesn't appear to be a recent regression.

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