+Optional<MCOperand>
+X86MCInstLower::LowerMachineOperand(const MachineInstr *MI,
+ const MachineOperand &MO) const {
+ switch (MO.getType()) {
+ default:
+ MI->dump();
+ llvm_unreachable("unknown operand type");
+ case MachineOperand::MO_Register:
+ // Ignore all implicit register operands.
+ if (MO.isImplicit())
+ return None;
+ return MCOperand::createReg(MO.getReg());
+ case MachineOperand::MO_Immediate:
+ return MCOperand::createImm(MO.getImm());
+ case MachineOperand::MO_MachineBasicBlock:
+ case MachineOperand::MO_GlobalAddress:
+ case MachineOperand::MO_ExternalSymbol:
+ return LowerSymbolOperand(MO, GetSymbolFromOperand(MO));
+ case MachineOperand::MO_MCSymbol:
+ return LowerSymbolOperand(MO, MO.getMCSymbol());
+ case MachineOperand::MO_JumpTableIndex:
+ return LowerSymbolOperand(MO, AsmPrinter.GetJTISymbol(MO.getIndex()));
+ case MachineOperand::MO_ConstantPoolIndex:
+ return LowerSymbolOperand(MO, AsmPrinter.GetCPISymbol(MO.getIndex()));
+ case MachineOperand::MO_BlockAddress:
+ return LowerSymbolOperand(
+ MO, AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress()));
+ case MachineOperand::MO_RegisterMask:
+ // Ignore call clobbers.
+ return None;
+ }
+}
+