-bool Thumb1InstrInfo::
-restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- const std::vector<CalleeSavedInfo> &CSI) const {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (CSI.empty())
- return false;
-
- bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
- MachineInstr *PopMI = MF.CreateMachineInstr(get(ARM::tPOP),MI->getDebugLoc());
- for (unsigned i = CSI.size(); i != 0; --i) {
- unsigned Reg = CSI[i-1].getReg();
- if (Reg == ARM::LR) {
- // Special epilogue for vararg functions. See emitEpilogue
- if (isVarArg)
- continue;
- Reg = ARM::PC;
- PopMI->setDesc(get(ARM::tPOP_RET));
- MI = MBB.erase(MI);
- }
- PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
- }
-
- // It's illegal to emit pop instruction without operands.
- if (PopMI->getNumOperands() > 0)
- MBB.insert(MI, PopMI);
-
- return true;
-}
-
-MachineInstr *Thumb1InstrInfo::
-foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
- const SmallVectorImpl<unsigned> &Ops, int FI) const {
- if (Ops.size() != 1) return NULL;
-
- unsigned OpNum = Ops[0];
- unsigned Opc = MI->getOpcode();
- MachineInstr *NewMI = NULL;
- switch (Opc) {
- default: break;
- case ARM::tMOVr:
- case ARM::tMOVtgpr2gpr:
- case ARM::tMOVgpr2tgpr:
- case ARM::tMOVgpr2gpr: {
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- bool isKill = MI->getOperand(1).isKill();
- if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
- // tSpill cannot take a high register operand.
- break;
- NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tSpill))
- .addReg(SrcReg, getKillRegState(isKill))
- .addFrameIndex(FI).addImm(0));
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
- // tRestore cannot target a high register operand.
- break;
- bool isDead = MI->getOperand(0).isDead();
- NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tRestore))
- .addReg(DstReg,
- RegState::Define | getDeadRegState(isDead))
- .addFrameIndex(FI).addImm(0));
- }
- break;
- }
- }
-
- return NewMI;