- return 0;
-}
-
-void
-XCoreRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
- RegScavenger *RS) const {
- MachineFrameInfo *MFI = MF.getFrameInfo();
- bool LRUsed = MF.getRegInfo().isPhysRegUsed(XCore::LR);
- const TargetRegisterClass *RC = XCore::GRRegsRegisterClass;
- XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>();
- if (LRUsed) {
- MF.getRegInfo().setPhysRegUnused(XCore::LR);
-
- bool isVarArg = MF.getFunction()->isVarArg();
- int FrameIdx;
- if (! isVarArg) {
- // A fixed offset of 0 allows us to save / restore LR using entsp / retsp.
- FrameIdx = MFI->CreateFixedObject(RC->getSize(), 0, true, false);
- } else {
- FrameIdx = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(),
- false);
- }
- XFI->setUsesLR(FrameIdx);
- XFI->setLRSpillSlot(FrameIdx);
- }
- if (requiresRegisterScavenging(MF)) {
- // Reserve a slot close to SP or frame pointer.
- RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
- RC->getAlignment(),
- false));
- }
- if (hasFP(MF)) {
- // A callee save register is used to hold the FP.
- // This needs saving / restoring in the epilogue / prologue.
- XFI->setFPSpillSlot(MFI->CreateStackObject(RC->getSize(),
- RC->getAlignment(),
- false));
- }
-}
-
-void XCoreRegisterInfo::
-processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
-
-}
-
-void XCoreRegisterInfo::
-loadConstant(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned DstReg, int64_t Value, DebugLoc dl) const {
- // TODO use mkmsk if possible.
- if (!isImmU16(Value)) {
- // TODO use constant pool.
- std::string msg;
- raw_string_ostream Msg(msg);
- Msg << "loadConstant value too big " << Value;
- llvm_report_error(Msg.str());
- }
- int Opcode = isImmU6(Value) ? XCore::LDC_ru6 : XCore::LDC_lru6;
- BuildMI(MBB, I, dl, TII.get(Opcode), DstReg).addImm(Value);
-}
-
-void XCoreRegisterInfo::
-storeToStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned SrcReg, int Offset, DebugLoc dl) const {
- assert(Offset%4 == 0 && "Misaligned stack offset");
- Offset/=4;
- bool isU6 = isImmU6(Offset);
- if (!isU6 && !isImmU16(Offset)) {
- std::string msg;
- raw_string_ostream Msg(msg);
- Msg << "storeToStack offset too big " << Offset;
- llvm_report_error(Msg.str());
- }
- int Opcode = isU6 ? XCore::STWSP_ru6 : XCore::STWSP_lru6;
- BuildMI(MBB, I, dl, TII.get(Opcode))
- .addReg(SrcReg)
- .addImm(Offset);
-}
-
-void XCoreRegisterInfo::
-loadFromStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned DstReg, int Offset, DebugLoc dl) const {
- assert(Offset%4 == 0 && "Misaligned stack offset");
- Offset/=4;
- bool isU6 = isImmU6(Offset);
- if (!isU6 && !isImmU16(Offset)) {
- std::string msg;
- raw_string_ostream Msg(msg);
- Msg << "loadFromStack offset too big " << Offset;
- llvm_report_error(Msg.str());
- }
- int Opcode = isU6 ? XCore::LDWSP_ru6 : XCore::LDWSP_lru6;
- BuildMI(MBB, I, dl, TII.get(Opcode), DstReg)
- .addImm(Offset);
-}
-
-void XCoreRegisterInfo::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
- MachineBasicBlock::iterator MBBI = MBB.begin();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
- XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>();
- DebugLoc dl = (MBBI != MBB.end() ?
- MBBI->getDebugLoc() : DebugLoc::getUnknownLoc());
-
- bool FP = hasFP(MF);
-
- // Work out frame sizes.
- int FrameSize = MFI->getStackSize();
-
- assert(FrameSize%4 == 0 && "Misaligned frame size");
-
- FrameSize/=4;
-
- bool isU6 = isImmU6(FrameSize);
-
- if (!isU6 && !isImmU16(FrameSize)) {
- // FIXME could emit multiple instructions.
- std::string msg;
- raw_string_ostream Msg(msg);
- Msg << "emitPrologue Frame size too big: " << FrameSize;
- llvm_report_error(Msg.str());
- }
- bool emitFrameMoves = needsFrameMoves(MF);
-
- // Do we need to allocate space on the stack?
- if (FrameSize) {
- bool saveLR = XFI->getUsesLR();
- bool LRSavedOnEntry = false;
- int Opcode;
- if (saveLR && (MFI->getObjectOffset(XFI->getLRSpillSlot()) == 0)) {
- Opcode = (isU6) ? XCore::ENTSP_u6 : XCore::ENTSP_lu6;
- MBB.addLiveIn(XCore::LR);
- saveLR = false;
- LRSavedOnEntry = true;
- } else {
- Opcode = (isU6) ? XCore::EXTSP_u6 : XCore::EXTSP_lu6;
- }
- BuildMI(MBB, MBBI, dl, TII.get(Opcode)).addImm(FrameSize);
-
- if (emitFrameMoves) {
- std::vector<MachineMove> &Moves = MMI->getFrameMoves();
-
- // Show update of SP.
- MCSymbol *FrameLabel = MMI->getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, dl, TII.get(XCore::DBG_LABEL)).addSym(FrameLabel);
-
- MachineLocation SPDst(MachineLocation::VirtualFP);
- MachineLocation SPSrc(MachineLocation::VirtualFP, -FrameSize * 4);
- Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
-
- if (LRSavedOnEntry) {
- MachineLocation CSDst(MachineLocation::VirtualFP, 0);
- MachineLocation CSSrc(XCore::LR);
- Moves.push_back(MachineMove(FrameLabel, CSDst, CSSrc));
- }
- }
- if (saveLR) {
- int LRSpillOffset = MFI->getObjectOffset(XFI->getLRSpillSlot());
- storeToStack(MBB, MBBI, XCore::LR, LRSpillOffset + FrameSize*4, dl);
- MBB.addLiveIn(XCore::LR);
-
- if (emitFrameMoves) {
- MCSymbol *SaveLRLabel = MMI->getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, dl, TII.get(XCore::DBG_LABEL)).addSym(SaveLRLabel);
- MachineLocation CSDst(MachineLocation::VirtualFP, LRSpillOffset);
- MachineLocation CSSrc(XCore::LR);
- MMI->getFrameMoves().push_back(MachineMove(SaveLRLabel, CSDst, CSSrc));
- }
- }
- }
-
- if (FP) {
- // Save R10 to the stack.
- int FPSpillOffset = MFI->getObjectOffset(XFI->getFPSpillSlot());
- storeToStack(MBB, MBBI, XCore::R10, FPSpillOffset + FrameSize*4, dl);
- // R10 is live-in. It is killed at the spill.
- MBB.addLiveIn(XCore::R10);
- if (emitFrameMoves) {
- MCSymbol *SaveR10Label = MMI->getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, dl, TII.get(XCore::DBG_LABEL)).addSym(SaveR10Label);
- MachineLocation CSDst(MachineLocation::VirtualFP, FPSpillOffset);
- MachineLocation CSSrc(XCore::R10);
- MMI->getFrameMoves().push_back(MachineMove(SaveR10Label, CSDst, CSSrc));
- }
- // Set the FP from the SP.
- unsigned FramePtr = XCore::R10;
- BuildMI(MBB, MBBI, dl, TII.get(XCore::LDAWSP_ru6), FramePtr)
- .addImm(0);
- if (emitFrameMoves) {
- // Show FP is now valid.
- MCSymbol *FrameLabel = MMI->getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, dl, TII.get(XCore::DBG_LABEL)).addSym(FrameLabel);
- MachineLocation SPDst(FramePtr);
- MachineLocation SPSrc(MachineLocation::VirtualFP);
- MMI->getFrameMoves().push_back(MachineMove(FrameLabel, SPDst, SPSrc));
- }
- }
-
- if (emitFrameMoves) {
- // Frame moves for callee saved.
- std::vector<MachineMove> &Moves = MMI->getFrameMoves();
- std::vector<std::pair<MCSymbol*, CalleeSavedInfo> >&SpillLabels =
- XFI->getSpillLabels();
- for (unsigned I = 0, E = SpillLabels.size(); I != E; ++I) {
- MCSymbol *SpillLabel = SpillLabels[I].first;
- CalleeSavedInfo &CSI = SpillLabels[I].second;
- int Offset = MFI->getObjectOffset(CSI.getFrameIdx());
- unsigned Reg = CSI.getReg();
- MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
- MachineLocation CSSrc(Reg);
- Moves.push_back(MachineMove(SpillLabel, CSDst, CSSrc));
- }
- }