1 //=- SPIRVMCInstLower.cpp - Convert SPIR-V MachineInstr to MCInst -*- C++ -*-=// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains code to lower SPIR-V MachineInstrs to their corresponding 10 // MCInst records. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "SPIRVMCInstLower.h" 15 #include "SPIRV.h" 16 #include "SPIRVModuleAnalysis.h" 17 #include "SPIRVUtils.h" 18 #include "llvm/CodeGen/MachineInstr.h" 19 #include "llvm/IR/Constants.h" 20 21 using namespace llvm; 22 23 void SPIRVMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI, 24 SPIRV::ModuleAnalysisInfo *MAI) const { 25 OutMI.setOpcode(MI->getOpcode()); 26 const MachineFunction *MF = MI->getMF(); 27 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 28 const MachineOperand &MO = MI->getOperand(i); 29 MCOperand MCOp; 30 switch (MO.getType()) { 31 default: 32 llvm_unreachable("unknown operand type"); 33 case MachineOperand::MO_GlobalAddress: { 34 Register FuncReg = MAI->getFuncReg(dyn_cast<Function>(MO.getGlobal())); 35 assert(FuncReg.isValid() && "Cannot find function Id"); 36 MCOp = MCOperand::createReg(FuncReg); 37 break; 38 } 39 case MachineOperand::MO_MachineBasicBlock: 40 MCOp = MCOperand::createReg(MAI->getOrCreateMBBRegister(*MO.getMBB())); 41 break; 42 case MachineOperand::MO_Register: { 43 Register NewReg = MAI->getRegisterAlias(MF, MO.getReg()); 44 MCOp = MCOperand::createReg(NewReg.isValid() ? NewReg : MO.getReg()); 45 break; 46 } 47 case MachineOperand::MO_Immediate: 48 if (MI->getOpcode() == SPIRV::OpExtInst && i == 2) { 49 Register Reg = MAI->getExtInstSetReg(MO.getImm()); 50 MCOp = MCOperand::createReg(Reg); 51 } else { 52 MCOp = MCOperand::createImm(MO.getImm()); 53 } 54 break; 55 case MachineOperand::MO_FPImmediate: 56 MCOp = MCOperand::createDFPImm( 57 MO.getFPImm()->getValueAPF().convertToFloat()); 58 break; 59 } 60 61 OutMI.addOperand(MCOp); 62 } 63 } 64