[LLVMbugs] [Bug 22548] New: Register coalescer crash with sub-reg liveness enabled

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22548

            Bug ID: 22548
           Summary: Register coalescer crash with sub-reg liveness enabled
           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

I've run into a crash in the regsiter coalescer when sub-reg liveness is
enabled in the R600 backend.  The test case has been committed to ToT, and to
reproduce you will need to modify AMDGPUSubtarget::enableSubRegLiveness() to
return true and then run the test with llc:

llc -march=amdgcn test/CodeGen/R600/subreg-coalescer-crash.ll -o -

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