[LLVMbugs] [Bug 4479] New: register scavenger assertion failure

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4479

           Summary: register scavenger assertion failure
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: bob.wilson at apple.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=3138)
 --> (http://llvm.org/bugs/attachment.cgi?id=3138)
testcase

This attached bugpoint test causes an assertion failure in the register
scavenger when compiling with "llc -O3 -relocation-model=pic
-mcpu=arm1136jf-s":

Assertion failed: (isUsed(Reg) && "Using an undefined register!"), function
forward, file
/Users/bwilson/local/llvm/llvm/lib/CodeGen/RegisterScavenging.cpp, line 266.


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