[LLVMbugs] [Bug 10852] New: ARM llc assertion

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10852

           Summary: ARM llc assertion
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: pdox at google.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=7214)
 --> (http://llvm.org/bugs/attachment.cgi?id=7214)
minimal example

llc: llvm/lib/CodeGen/RegisterScavenging.cpp:215: void
llvm::RegScavenger::forward(): Assertion `SubUsed && "Using an undefined
register!"' failed.

Attached is a minimal example (minimal.ll), emitted by bugpoint.

Compile with:
$ llc minimal.ll -march=arm -mcpu=cortex-a8 -mtriple=armv7a-none-linux-gnueabi

The assertion started happening at r138791.

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