129 lines
4.1 KiB
C++
129 lines
4.1 KiB
C++
#include "FootFrameLowering.h"
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#include "FootMachineFunctionInfo.h"
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#include "MCTargetDesc/FootMCTargetDesc.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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using namespace llvm;
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bool FootFrameLowering::hasFPImpl(const MachineFunction& MF) const {
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return false;
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}
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void FootFrameLowering::emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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MachineFrameInfo &MFI = MF.getFrameInfo();
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const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
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int FI = MF.getInfo<FootMachineFunctionInfo>()->getReturnAddressFrameIndex();
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BuildMI(MBB, MBB.begin(), DebugLoc(), TII->get(Foot::BWOR_I_D_M_A))
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.addFrameIndex(FI)
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.addReg(Foot::RRA)
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.addImm(0);
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unsigned NumBytes = MFI.getStackSize();
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if (NumBytes > 0) {
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const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
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if (NumBytes < (1 << 5)) {
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BuildMI(MBB, MBB.begin(), DebugLoc(), TII->get(Foot::SUBT_D_D_M_A), Foot::RSP)
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.addReg(Foot::RSP)
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.addImm(NumBytes);
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}
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else {
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BuildMI(MBB, MBB.begin(), DebugLoc(), TII->get(Foot::SUBT_D_D_D_A), Foot::RSP)
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.addReg(Foot::RSP)
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.addReg(Foot::R27);
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BuildMI(MBB, MBB.begin(), DebugLoc(), TII->get(Foot::CNST_D_A), Foot::R27)
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.addImm(NumBytes);
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}
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}
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}
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void FootFrameLowering::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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MachineFrameInfo &MFI = MF.getFrameInfo();
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const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
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unsigned NumBytes = MFI.getStackSize();
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int FI = MF.getInfo<FootMachineFunctionInfo>()->getReturnAddressFrameIndex();
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BuildMI(MBB, MBB.getFirstTerminator(), DebugLoc(), TII->get(Foot::BWOR_D_I_M_A))
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.addReg(Foot::RRA)
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.addFrameIndex(FI)
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.addImm(0);
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if (NumBytes > 0) {
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const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
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if (NumBytes < (1 << 5)) {
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BuildMI(MBB, MBB.getFirstTerminator(), DebugLoc(), TII->get(Foot::ADDI_D_D_M_A), Foot::RSP)
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.addReg(Foot::RSP)
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.addImm(NumBytes);
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}
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else {
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BuildMI(MBB, MBB.getFirstTerminator(), DebugLoc(), TII->get(Foot::ADDI_D_D_D_A), Foot::RSP)
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.addReg(Foot::RSP)
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.addReg(Foot::R27);
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BuildMI(MBB, MBB.getFirstTerminator(), DebugLoc(), TII->get(Foot::CNST_D_A), Foot::R27)
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.addImm(NumBytes);
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}
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}
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const auto& I = MBB.getFirstTerminator();
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BuildMI(MBB, MBB.getFirstTerminator(), I->getDebugLoc(), TII->get(Foot::COPY_D_D_A))
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.addReg(Foot::RPC)
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.addReg(Foot::RRA);
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MBB.erase(I);
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}
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MachineBasicBlock::iterator FootFrameLowering::eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const {
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const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
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unsigned Opc = MI->getOpcode();
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assert(hasReservedCallFrame(MF) && "Foot doesn't have an FP register");
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if (Opc != TII->getCallFrameSetupOpcode() &&
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Opc != TII->getCallFrameDestroyOpcode()) {
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report_fatal_error("Unexpected frame psuedo instruction");
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}
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if (MI->getOperand(1).getImm() != 0) {
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report_fatal_error("callee pop count not supported");
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}
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return MBB.erase(MI);
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}
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StackOffset FootFrameLowering::getFrameIndexReference(const MachineFunction &MF, int FrameIndex,
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Register &FrameReg) const {
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const MachineFrameInfo &MFI = MF.getFrameInfo();
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int Offset = MFI.getObjectSize(FrameIndex) + getOffsetOfLocalArea() +
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MFI.getStackSize();
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if (hasFP(MF)) {
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llvm_unreachable("foot has no frame pointer");
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}
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FrameReg = Foot::RSP;
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return StackOffset::getFixed(Offset);
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}
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void FootFrameLowering::determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const {
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TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
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MachineFrameInfo &MFI = MF.getFrameInfo();
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int RetAddrFI = MFI.CreateStackObject(4, Align(4), false);
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MF.getInfo<FootMachineFunctionInfo>()->setReturnAddressFrameIndex(RetAddrFI);
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}
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