[llvm-bugs] [Bug 44981] New: LiveVariables.cpp:114: void llvm::LiveVariables::MarkVirtRegAliveInBlock(llvm::LiveVariables::VarInfo &, llvm::MachineBasicBlock *, llvm::MachineBasicBlock *, std::vector<MachineBasicBlock *> &): Assertion `MBB != &MF->front() && "Can't find reaching def

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https://bugs.llvm.org/show_bug.cgi?id=44981

            Bug ID: 44981
           Summary: LiveVariables.cpp:114: void
                    llvm::LiveVariables::MarkVirtRegAliveInBlock(llvm::Liv
                    eVariables::VarInfo &, llvm::MachineBasicBlock *,
                    llvm::MachineBasicBlock *,
                    std::vector<MachineBasicBlock *> &): Assertion `MBB !=
                    &MF->front() && "Can't find reaching def
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: joerg at NetBSD.org
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com,
                    t.p.northover at gmail.com, Ties.Stuij at arm.com

Created attachment 23153
  --> https://bugs.llvm.org/attachment.cgi?id=23153&action=edit
Reduced test case

Try building the attached testcase for ARM with -O or higher.

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