[LLVMbugs] [Bug 23720] New: MachineInstr verification error with sub-reg liveness enabled in R600 backend

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23720

            Bug ID: 23720
           Summary: MachineInstr verification error with sub-reg liveness
                    enabled in R600 backend
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: tstellar at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14413
  --> https://llvm.org/bugs/attachment.cgi?id=14413&action=edit
Reduced test case

This bug can be reproduced by applying the attached patch to enable sub-reg
liveness and running the attached test case with llc:

./llc -verify-machineinstrs -march=amdgcn r600-sub-reg-liveness-crash.ll -o -

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