[llvm-bugs] [Bug 48997] New: Not supported instr: <MCInst 0 <MCOperand Reg:227> <MCOperand Reg:226> <MCOperand Expr:(LBB0_2)>>

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48997

            Bug ID: 48997
           Summary: Not supported instr: <MCInst 0 <MCOperand Reg:227>
                    <MCOperand Reg:226> <MCOperand Expr:(LBB0_2)>>
           Product: clang
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dennis.frett at live.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Created attachment 24473
  --> https://bugs.llvm.org/attachment.cgi?id=24473&action=edit
reduced.ll

When compiling the attached bitcode file with O0, I get:

Not supported instr: <MCInst 0 <MCOperand Reg:227> <MCOperand Reg:226>
<MCOperand Expr:(LBB0_2)>>

To reproduce:
llc reduced.ll --filetype=obj -O0

or

clang -cc1 -x ir reduced.ll -o out -triple arm64-apple-ios8.0.0 -emit-obj -O0

- Emitting for macOS (x86_64-apple-darwin20.2.0) works without a problem.
- Emitting with non-O0 optimisation level works without a problem.

llc backtrace:
LLVM ERROR: Not supported instr: <MCInst 0 <MCOperand Reg:227> <MCOperand
Reg:226> <MCOperand Expr:(LBB0_2)>>
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments: llc reduced.ll --filetype=obj -O0
1.      Running pass 'Function Pass Manager' on module 'reduced.ll'.
2.      Running pass 'AArch64 Assembly Printer' on function '@MyFunction'
0  libLLVM.dylib            0x000000010ae0f4d5
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1  libLLVM.dylib            0x000000010ae0f97c SignalHandler(int) + 200
2  libsystem_platform.dylib 0x00007fff20374d7d _sigtramp + 29
3  libLLVM.dylib            0x000000010e79a920 _dyld_private + 0
4  libsystem_c.dylib        0x00007fff20283720 abort + 120
5  libLLVM.dylib            0x000000010ad85e51
llvm::report_fatal_error(llvm::Twine const&, bool) + 270
6  libLLVM.dylib            0x000000010ad85eb0
llvm::report_fatal_error(llvm::StringRef, bool) + 0
7  libLLVM.dylib            0x000000010bf6ac4b (anonymous
namespace)::AArch64MCCodeEmitter::getBinaryCodeForInstr(llvm::MCInst const&,
llvm::SmallVectorImpl<llvm::MCFixup>&, llvm::MCSubtargetInfo const&) const +
29319
8  libLLVM.dylib            0x000000010bf639aa (anonymous
namespace)::AArch64MCCodeEmitter::encodeInstruction(llvm::MCInst const&,
llvm::raw_ostream&, llvm::SmallVectorImpl<llvm::MCFixup>&,
llvm::MCSubtargetInfo const&) const + 90
9  libLLVM.dylib            0x000000010badc782 (anonymous
namespace)::MCMachOStreamer::emitInstToData(llvm::MCInst const&,
llvm::MCSubtargetInfo const&) + 142
10 libLLVM.dylib            0x000000010bae2216
llvm::MCObjectStreamer::emitInstruction(llvm::MCInst const&,
llvm::MCSubtargetInfo const&) + 240
11 libLLVM.dylib            0x000000010be53ed7 (anonymous
namespace)::AArch64AsmPrinter::emitInstruction(llvm::MachineInstr const*) +
5991
12 libLLVM.dylib            0x000000010b31de22
llvm::AsmPrinter::emitFunctionBody() + 1904
13 libLLVM.dylib            0x000000010be50c0a (anonymous
namespace)::AArch64AsmPrinter::runOnMachineFunction(llvm::MachineFunction&) +
180
14 libLLVM.dylib            0x000000010b01a3e7
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 239
15 libLLVM.dylib            0x000000010aed605e
llvm::FPPassManager::runOnFunction(llvm::Function&) + 536
16 libLLVM.dylib            0x000000010aed9a7a
llvm::FPPassManager::runOnModule(llvm::Module&) + 52
17 libLLVM.dylib            0x000000010aed64de
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 684
18 llc                      0x0000000108a3d49e compileModule(char**,
llvm::LLVMContext&) + 5956
19 llc                      0x0000000108a3b978 main + 1273
20 libdyld.dylib            0x00007fff2034b621 start + 1
21 libdyld.dylib            0x0000000000000004 start + 18446603339975838180

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