1 //===- HexagonMCInstLower.cpp - Convert Hexagon MachineInstr to an MCInst -===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains code to lower Hexagon MachineInstrs to their corresponding 11 // MCInst records. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "Hexagon.h" 16 #include "HexagonAsmPrinter.h" 17 #include "HexagonMachineFunctionInfo.h" 18 #include "llvm/Constants.h" 19 #include "llvm/CodeGen/MachineBasicBlock.h" 20 #include "llvm/MC/MCExpr.h" 21 #include "llvm/MC/MCInst.h" 22 #include "llvm/Target/Mangler.h" 23 24 using namespace llvm; 25 26 static MCOperand GetSymbolRef(const MachineOperand& MO, const MCSymbol* Symbol, 27 HexagonAsmPrinter& Printer) { 28 MCContext &MC = Printer.OutContext; 29 const MCExpr *ME; 30 31 ME = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, MC); 32 33 if (!MO.isJTI() && MO.getOffset()) 34 ME = MCBinaryExpr::CreateAdd(ME, MCConstantExpr::Create(MO.getOffset(), MC), 35 MC); 36 37 return (MCOperand::CreateExpr(ME)); 38 } 39 40 // Create an MCInst from a MachineInstr 41 void llvm::HexagonLowerToMC(const MachineInstr* MI, MCInst& MCI, 42 HexagonAsmPrinter& AP) { 43 MCI.setOpcode(MI->getOpcode()); 44 45 for (unsigned i = 0, e = MI->getNumOperands(); i < e; i++) { 46 const MachineOperand &MO = MI->getOperand(i); 47 MCOperand MCO; 48 49 switch (MO.getType()) { 50 default: 51 MI->dump(); 52 llvm_unreachable("unknown operand type"); 53 case MachineOperand::MO_Register: 54 // Ignore all implicit register operands. 55 if (MO.isImplicit()) continue; 56 MCO = MCOperand::CreateReg(MO.getReg()); 57 break; 58 case MachineOperand::MO_FPImmediate: { 59 APFloat Val = MO.getFPImm()->getValueAPF(); 60 // FP immediates are used only when setting GPRs, so they may be dealt 61 // with like regular immediates from this point on. 62 MCO = MCOperand::CreateImm(*Val.bitcastToAPInt().getRawData()); 63 break; 64 } 65 case MachineOperand::MO_Immediate: 66 MCO = MCOperand::CreateImm(MO.getImm()); 67 break; 68 case MachineOperand::MO_MachineBasicBlock: 69 MCO = MCOperand::CreateExpr 70 (MCSymbolRefExpr::Create(MO.getMBB()->getSymbol(), 71 AP.OutContext)); 72 break; 73 case MachineOperand::MO_GlobalAddress: 74 MCO = GetSymbolRef(MO, AP.Mang->getSymbol(MO.getGlobal()), AP); 75 break; 76 case MachineOperand::MO_ExternalSymbol: 77 MCO = GetSymbolRef(MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()), 78 AP); 79 break; 80 case MachineOperand::MO_JumpTableIndex: 81 MCO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP); 82 break; 83 case MachineOperand::MO_ConstantPoolIndex: 84 MCO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP); 85 break; 86 case MachineOperand::MO_BlockAddress: 87 MCO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP); 88 break; 89 } 90 91 MCI.addOperand(MCO); 92 } 93 } 94
