[LLVMbugs] [Bug 23444] New: ARMv7 -O0: Cannot scavenge register without an emergency spill slot!

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23444

            Bug ID: 23444
           Summary: ARMv7 -O0: Cannot scavenge register without an
                    emergency spill slot!
           Product: libraries
           Version: trunk
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: stoklund at 2pi.dk
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14296
  --> https://llvm.org/bugs/attachment.cgi?id=14296&action=edit
Binary test case

llc -O0 fn06.bc
Assertion failed: (Scavenged[SI].FrameIndex >= 0 && "Cannot scavenge register
without an emergency spill slot!"), function scavengeRegister, file
/Users/jolesen/llvm/lib/CodeGen/RegisterScavenging.cpp, line 419.
0  llc                      0x000000010c6a786e
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 46
1  llc                      0x000000010c6a8e39
PrintStackTraceSignalHandler(void*) + 25
2  llc                      0x000000010c6a9275 SignalHandler(int) + 565
3  libsystem_platform.dylib 0x00007fff81da45aa _sigtramp + 26
4  libsystem_platform.dylib 0x0000000000004000 _sigtramp + 2116418160
5  llc                      0x000000010c6a8e5b raise + 27
6  llc                      0x000000010c6a8f12 abort + 18
7  llc                      0x000000010c6a8ef1 __assert_rtn + 129
8  llc                      0x000000010bc72c3c
llvm::RegScavenger::scavengeRegister(llvm::TargetRegisterClass const*,
llvm::MachineBasicBlock::bundle_iterator<llvm::MachineInstr,
llvm::ilist_iterator<llvm::MachineInstr> >, int) + 1308
9  llc                      0x000000010bbe1547 (anonymous
namespace)::PEI::scavengeFrameVirtualRegs(llvm::MachineFunction&) + 1495
10 llc                      0x000000010bbdd9c6 (anonymous
namespace)::PEI::runOnMachineFunction(llvm::MachineFunction&) + 614
11 llc                      0x000000010bb06b8e
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 110
12 llc                      0x000000010c52e38b
llvm::FPPassManager::runOnFunction(llvm::Function&) + 427
13 llc                      0x000000010c52e698
llvm::FPPassManager::runOnModule(llvm::Module&) + 104
14 llc                      0x000000010c52f0a4 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&) + 1412
15 llc                      0x000000010c52e94e
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 302
16 llc                      0x000000010c52f821
llvm::legacy::PassManager::run(llvm::Module&) + 33
17 llc                      0x000000010a77b5e8 compileModule(char**,
llvm::LLVMContext&) + 9432
18 llc                      0x000000010a7790a9 main + 233
19 libdyld.dylib            0x00007fff899355fd start + 1
Stack dump:
0.    Program arguments: build/Debug+Asserts/bin/llc -O0 fn06.bc 
1.    Running pass 'Function Pass Manager' on module 'fn06.bc'.
2.    Running pass 'Prologue/Epilogue Insertion & Frame Finalization' on
function '@s_'

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