[llvm-bugs] [Bug 26805] New: Register coalescer introduces verifier error

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https://llvm.org/bugs/show_bug.cgi?id=26805

            Bug ID: 26805
           Summary: Register coalescer introduces verifier error
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Register Allocator
          Assignee: matze at braunis.de
          Reporter: Matthew.Arsenault at amd.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The XFAILed test in test/CodeGen/AMDGPU/reg-coalescer-sched-crash.ll is a
verifier error introduced by the register coalescer. I think it has something
to do with rematerializing an instruction into a sub register when the super
register isn't fully defined.

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