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

Sun Jul 1 10:52:59 PDT 2018

Also shouldn't, BND2 be a use not a def. The instruction takes a BND
register and a GPR as inputs. It's output is to signal #BR if the check
fails.

~Craig

On Sun, Jul 1, 2018 at 10:41 AM Craig Topper <craig.topper at gmail.com> wrote:

> BNDCU shouldn't be printing more than 2 operands.
>
> On trunk right now, it uses case 4 for the first fragment (operand 1).
> Case 1 for the second fragment (a comma and a space). And fragment 2 for
> the third fragment (operand 0).
>
> Are you using trunk or an earlier version?
>
> ~Craig
>
>
> On Sun, Jul 1, 2018 at 10:14 AM Youren Shen via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> 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
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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