[LLVMbugs] [Bug 5411] New: Another regscavenger assertion

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5411

           Summary: Another regscavenger assertion
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: ARM
        AssignedTo: evan.cheng at apple.com
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu


Consider attached bytecode. llc fails with:

$ ./llc -mcpu=cortex-a8 bugpoint-reduced-simplified.ll 
llc: /home/asl/proj/llvm/src_arm/lib/CodeGen/RegisterScavenging.cpp:196: void
llvm::RegScavenger::forward(): Assertion `SubUsed && "Using an undefined
register!"' failed.
0  llc             0x0000000000cb28d6
1  llc             0x0000000000cb2e72
2  libpthread.so.0 0x00007f5075b006f0
3  libc.so.6       0x00007f5074e3c9c5 gsignal + 53
4  libc.so.6       0x00007f5074e3de70 abort + 272
5  libc.so.6       0x00007f5074e35edf __assert_fail + 239
6  llc             0x0000000000a14b24 llvm::RegScavenger::forward() + 1112
7  llc             0x00000000005d0bf9
llvm::RegScavenger::forward(llvm::ilist_iterator<llvm::MachineInstr>) + 109
8  llc             0x00000000009dfa09
llvm::PEI::scavengeFrameVirtualRegs(llvm::MachineFunction&) + 1339
9  llc             0x00000000009e1593
llvm::PEI::runOnMachineFunction(llvm::MachineFunction&) + 483
10 llc             0x00000000009b8cb5
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 83
11 llc             0x0000000000c3595f
llvm::FPPassManager::runOnFunction(llvm::Function&) + 329
12 llc             0x0000000000c375ef
llvm::FunctionPassManagerImpl::run(llvm::Function&) + 111
13 llc             0x0000000000c37796
llvm::FunctionPassManager::run(llvm::Function&) + 112
14 llc             0x0000000000401ec0 main + 3064
15 libc.so.6       0x00007f5074e29a44 __libc_start_main + 244
16 llc             0x0000000000400249
Stack dump:
0.      Program arguments: ./llc -mcpu=cortex-a8 bugpoint-reduced-simplified.ll 
1.      Running pass 'Prolog/Epilog Insertion & Frame Finalization' on function
'@aaa'


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