[llvm-dev] Using BuildMI to insert Intel MPX instruction BNDCU failed

[Youren Shen via llvm-dev]

Hello everyone, I'm a newbie of llvm. I'm trying to insert Intel MPX
instruction BNDCU with BuildMI. I add my machinefunctionpass
at addPreEmitPass2.
Here is the code of insertion:

BuildMI(MBB, MI, DL, TII->get(X86::BNDCU64rr)).addReg(X86::BND2,
RegState::Define).addReg(X86::R10);

And here is to stack track  when I compiler program with modified llc:
/home/shenyouren/workspace/build-llvm/bin/llc -o obj/simple.s
obj/simple-opt.bc
llc: /home/shenyouren/workspace/llvm/include/llvm/ADT/SmallVector.h:154:
const T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2>
>::operator[](llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2>
>::size_type) const [with T = llvm::MCOperand; <template-parameter-1-2> =
void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2>
>::const_reference = const llvm::MCOperand&;
llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type =
long unsigned int]: Assertion `idx < size()' failed.
Stack dump:
0.      Program arguments: /home/shenyouren/workspace/build-llvm/bin/llc -o
obj/simple.s obj/simple-opt.bc
1.      Running pass 'Function Pass Manager' on module 'obj/simple-opt.bc'.
2.      Running pass 'X86 Assembly Printer' on function '@main'
#0 0x0000000003879bdf llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/home/shenyouren/workspace/llvm/lib/Support/Unix/Signals.inc:398:0
#1 0x0000000003879c72 PrintStackTraceSignalHandler(void*)
/home/shenyouren/workspace/llvm/lib/Support/Unix/Signals.inc:462:0
#2 0x0000000003877e5b llvm::sys::RunSignalHandlers()
/home/shenyouren/workspace/llvm/lib/Support/Signals.cpp:49:0
#3 0x0000000003879454 SignalHandler(int)
/home/shenyouren/workspace/llvm/lib/Support/Unix/Signals.inc:252:0
#4 0x00007fcc8f4c9390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#5 0x00007fcc8e67e428 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x35428)
#6 0x00007fcc8e68002a abort (/lib/x86_64-linux-gnu/libc.so.6+0x3702a)
#7 0x00007fcc8e676bd7 (/lib/x86_64-linux-gnu/libc.so.6+0x2dbd7)
#8 0x00007fcc8e676c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#9 0x00000000016b63bb llvm::SmallVectorTemplateCommon<llvm::MCOperand,
void>::operator[](unsigned long) const
/home/shenyouren/workspace/llvm/include/llvm/ADT/SmallVector.h:154:0
#10 0x00000000016b63bb llvm::MCInst::getOperand(unsigned int) const
/home/shenyouren/workspace/llvm/include/llvm/MC/MCInst.h:182:0
#11 0x00000000026695fd llvm::X86ATTInstPrinter::printOperand(llvm::MCInst
const*, unsigned int, llvm::raw_ostream&)
/home/shenyouren/workspace/llvm/lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp:185:0
#12 0x0000000002664c06
llvm::X86ATTInstPrinter::printInstruction(llvm::MCInst const*,
llvm::raw_ostream&)
/home/shenyouren/workspace/build-llvm/lib/Target/X86/X86GenAsmWriter.inc:48204:0
#13 0x0000000002668edc llvm::X86ATTInstPrinter::printInst(llvm::MCInst
const*, llvm::raw_ostream&, llvm::StringRef, llvm::MCSubtargetInfo const&)
/home/shenyouren/workspace/llvm/lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp:89:0
#14 0x00000000031d5811
llvm::MCTargetStreamer::prettyPrintAsm(llvm::MCInstPrinter&,
llvm::raw_ostream&, llvm::MCInst const&, llvm::MCSubtargetInfo const&)
/home/shenyouren/workspace/llvm/lib/MC/MCStreamer.cpp:856:0
#15 0x00000000031690e2 (anonymous
namespace)::MCAsmStreamer::EmitInstruction(llvm::MCInst const&,
llvm::MCSubtargetInfo const&, bool)
/home/shenyouren/workspace/llvm/lib/MC/MCAsmStreamer.cpp:1752:0
#16 0x0000000002355fdf
llvm::X86AsmPrinter::EmitAndCountInstruction(llvm::MCInst&)
/home/shenyouren/workspace/llvm/lib/Target/X86/X86MCInstLower.cpp:107:0
#17 0x0000000002360ae9
llvm::X86AsmPrinter::EmitInstruction(llvm::MachineInstr const*)
/home/shenyouren/workspace/llvm/lib/Target/X86/X86MCInstLower.cpp:2604:0
#18 0x000000000292e629 llvm::AsmPrinter::EmitFunctionBody()
/home/shenyouren/workspace/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp:1086:0
#19 0x0000000002352908
llvm::X86AsmPrinter::runOnMachineFunction(llvm::MachineFunction&)
/home/shenyouren/workspace/llvm/lib/Target/X86/X86AsmPrinter.cpp:79:0
#20 0x0000000002bc6afa
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
/home/shenyouren/workspace/llvm/lib/CodeGen/MachineFunctionPass.cpp:62:0
#21 0x000000000307eeac llvm::FPPassManager::runOnFunction(llvm::Function&)
/home/shenyouren/workspace/llvm/lib/IR/LegacyPassManager.cpp:1520:0
#22 0x000000000307f045 llvm::FPPassManager::runOnModule(llvm::Module&)
/home/shenyouren/workspace/llvm/lib/IR/LegacyPassManager.cpp:1541:0
#23 0x000000000307f3c0 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
/home/shenyouren/workspace/llvm/lib/IR/LegacyPassManager.cpp:1597:0
#24 0x000000000307fad5 llvm::legacy::PassManagerImpl::run(llvm::Module&)
/home/shenyouren/workspace/llvm/lib/IR/LegacyPassManager.cpp:1700:0
#25 0x000000000307fce1 llvm::legacy::PassManager::run(llvm::Module&)
/home/shenyouren/workspace/llvm/lib/IR/LegacyPassManager.cpp:1732:0
#26 0x00000000013e9361 compileModule(char**, llvm::LLVMContext&)
/home/shenyouren/workspace/llvm/tools/llc/llc.cpp:575:0
#27 0x00000000013e7a6d main
/home/shenyouren/workspace/llvm/tools/llc/llc.cpp:345:0
#28 0x00007fcc8e669830 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x20830)
#29 0x00000000013e5779 _start
(/home/shenyouren/workspace/build-llvm/bin/llc+0x13e5779)
Makefile:25: recipe for target 'obj/simple.s' failed

I have checked X86ATTInstPrinter::printInstruction(llvm::MCInst const*,
llvm::raw_ostream&)
/home/shenyouren/workspace/build-llvm/lib/Target/X86/X86GenAsmWriter.inc:48204,
and it will invoke printOperand(MI, 2, O); And I guess the BNDCU only have
2 operand, that's why it failed.
But I don't know how to fix it.
Is there anyone know how to solve this problem? I really appreciate for any
help!
-- 
Best Regards.
Youren Shen
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