| //===-- ARMBaseInstrInfo.h - ARM Base Instruction Information ---*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains the Base ARM implementation of the TargetInstrInfo class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_TARGET_ARM_ARMBASEINSTRINFO_H |
| #define LLVM_LIB_TARGET_ARM_ARMBASEINSTRINFO_H |
| |
| #include "MCTargetDesc/ARMBaseInfo.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/ADT/SmallSet.h" |
| #include "llvm/CodeGen/MachineBasicBlock.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineOperand.h" |
| #include "llvm/CodeGen/TargetInstrInfo.h" |
| #include <array> |
| #include <cstdint> |
| |
| #define GET_INSTRINFO_HEADER |
| #include "ARMGenInstrInfo.inc" |
| |
| namespace llvm { |
| |
| class ARMBaseRegisterInfo; |
| class ARMSubtarget; |
| |
| class ARMBaseInstrInfo : public ARMGenInstrInfo { |
| const ARMSubtarget &Subtarget; |
| |
| protected: |
| // Can be only subclassed. |
| explicit ARMBaseInstrInfo(const ARMSubtarget &STI); |
| |
| void expandLoadStackGuardBase(MachineBasicBlock::iterator MI, |
| unsigned LoadImmOpc, unsigned LoadOpc) const; |
| |
| /// Build the equivalent inputs of a REG_SEQUENCE for the given \p MI |
| /// and \p DefIdx. |
| /// \p [out] InputRegs of the equivalent REG_SEQUENCE. Each element of |
| /// the list is modeled as <Reg:SubReg, SubIdx>. |
| /// E.g., REG_SEQUENCE %1:sub1, sub0, %2, sub1 would produce |
| /// two elements: |
| /// - %1:sub1, sub0 |
| /// - %2<:0>, sub1 |
| /// |
| /// \returns true if it is possible to build such an input sequence |
| /// with the pair \p MI, \p DefIdx. False otherwise. |
| /// |
| /// \pre MI.isRegSequenceLike(). |
| bool getRegSequenceLikeInputs( |
| const MachineInstr &MI, unsigned DefIdx, |
| SmallVectorImpl<RegSubRegPairAndIdx> &InputRegs) const override; |
| |
| /// Build the equivalent inputs of a EXTRACT_SUBREG for the given \p MI |
| /// and \p DefIdx. |
| /// \p [out] InputReg of the equivalent EXTRACT_SUBREG. |
| /// E.g., EXTRACT_SUBREG %1:sub1, sub0, sub1 would produce: |
| /// - %1:sub1, sub0 |
| /// |
| /// \returns true if it is possible to build such an input sequence |
| /// with the pair \p MI, \p DefIdx. False otherwise. |
| /// |
| /// \pre MI.isExtractSubregLike(). |
| bool getExtractSubregLikeInputs(const MachineInstr &MI, unsigned DefIdx, |
| RegSubRegPairAndIdx &InputReg) const override; |
| |
| /// Build the equivalent inputs of a INSERT_SUBREG for the given \p MI |
| /// and \p DefIdx. |
| /// \p [out] BaseReg and \p [out] InsertedReg contain |
| /// the equivalent inputs of INSERT_SUBREG. |
| /// E.g., INSERT_SUBREG %0:sub0, %1:sub1, sub3 would produce: |
| /// - BaseReg: %0:sub0 |
| /// - InsertedReg: %1:sub1, sub3 |
| /// |
| /// \returns true if it is possible to build such an input sequence |
| /// with the pair \p MI, \p DefIdx. False otherwise. |
| /// |
| /// \pre MI.isInsertSubregLike(). |
| bool |
| getInsertSubregLikeInputs(const MachineInstr &MI, unsigned DefIdx, |
| RegSubRegPair &BaseReg, |
| RegSubRegPairAndIdx &InsertedReg) const override; |
| |
| /// Commutes the operands in the given instruction. |
| /// The commutable operands are specified by their indices OpIdx1 and OpIdx2. |
| /// |
| /// Do not call this method for a non-commutable instruction or for |
| /// non-commutable pair of operand indices OpIdx1 and OpIdx2. |
| /// Even though the instruction is commutable, the method may still |
| /// fail to commute the operands, null pointer is returned in such cases. |
| MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI, |
| unsigned OpIdx1, |
| unsigned OpIdx2) const override; |
| |
| /// If the specific machine instruction is a instruction that moves/copies |
| /// value from one register to another register return true along with |
| /// @Source machine operand and @Destination machine operand. |
| bool isCopyInstrImpl(const MachineInstr &MI, const MachineOperand *&Source, |
| const MachineOperand *&Destination) const override; |
| |
| public: |
| // Return whether the target has an explicit NOP encoding. |
| bool hasNOP() const; |
| |
| // Return the non-pre/post incrementing version of 'Opc'. Return 0 |
| // if there is not such an opcode. |
| virtual unsigned getUnindexedOpcode(unsigned Opc) const = 0; |
| |
| MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI, |
| MachineInstr &MI, |
| LiveVariables *LV) const override; |
| |
| virtual const ARMBaseRegisterInfo &getRegisterInfo() const = 0; |
| const ARMSubtarget &getSubtarget() const { return Subtarget; } |
| |
| ScheduleHazardRecognizer * |
| CreateTargetHazardRecognizer(const TargetSubtargetInfo *STI, |
| const ScheduleDAG *DAG) const override; |
| |
| ScheduleHazardRecognizer * |
| CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II, |
| const ScheduleDAG *DAG) const override; |
| |
| // Branch analysis. |
| bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, |
| MachineBasicBlock *&FBB, |
| SmallVectorImpl<MachineOperand> &Cond, |
| bool AllowModify = false) const override; |
| unsigned removeBranch(MachineBasicBlock &MBB, |
| int *BytesRemoved = nullptr) const override; |
| unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, |
| MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond, |
| const DebugLoc &DL, |
| int *BytesAdded = nullptr) const override; |
| |
| bool |
| reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override; |
| |
| // Predication support. |
| bool isPredicated(const MachineInstr &MI) const override; |
| |
| ARMCC::CondCodes getPredicate(const MachineInstr &MI) const { |
| int PIdx = MI.findFirstPredOperandIdx(); |
| return PIdx != -1 ? (ARMCC::CondCodes)MI.getOperand(PIdx).getImm() |
| : ARMCC::AL; |
| } |
| |
| bool PredicateInstruction(MachineInstr &MI, |
| ArrayRef<MachineOperand> Pred) const override; |
| |
| bool SubsumesPredicate(ArrayRef<MachineOperand> Pred1, |
| ArrayRef<MachineOperand> Pred2) const override; |
| |
| bool DefinesPredicate(MachineInstr &MI, |
| std::vector<MachineOperand> &Pred) const override; |
| |
| bool isPredicable(const MachineInstr &MI) const override; |
| |
| // CPSR defined in instruction |
| static bool isCPSRDefined(const MachineInstr &MI); |
| bool isAddrMode3OpImm(const MachineInstr &MI, unsigned Op) const; |
| bool isAddrMode3OpMinusReg(const MachineInstr &MI, unsigned Op) const; |
| |
| // Load, scaled register offset |
| bool isLdstScaledReg(const MachineInstr &MI, unsigned Op) const; |
| // Load, scaled register offset, not plus LSL2 |
| bool isLdstScaledRegNotPlusLsl2(const MachineInstr &MI, unsigned Op) const; |
| // Minus reg for ldstso addr mode |
| bool isLdstSoMinusReg(const MachineInstr &MI, unsigned Op) const; |
| // Scaled register offset in address mode 2 |
| bool isAm2ScaledReg(const MachineInstr &MI, unsigned Op) const; |
| // Load multiple, base reg in list |
| bool isLDMBaseRegInList(const MachineInstr &MI) const; |
| // get LDM variable defs size |
| unsigned getLDMVariableDefsSize(const MachineInstr &MI) const; |
| |
| /// GetInstSize - Returns the size of the specified MachineInstr. |
| /// |
| unsigned getInstSizeInBytes(const MachineInstr &MI) const override; |
| |
| unsigned isLoadFromStackSlot(const MachineInstr &MI, |
| int &FrameIndex) const override; |
| unsigned isStoreToStackSlot(const MachineInstr &MI, |
| int &FrameIndex) const override; |
| unsigned isLoadFromStackSlotPostFE(const MachineInstr &MI, |
| int &FrameIndex) const override; |
| unsigned isStoreToStackSlotPostFE(const MachineInstr &MI, |
| int &FrameIndex) const override; |
| |
| void copyToCPSR(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| unsigned SrcReg, bool KillSrc, |
| const ARMSubtarget &Subtarget) const; |
| void copyFromCPSR(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| unsigned DestReg, bool KillSrc, |
| const ARMSubtarget &Subtarget) const; |
| |
| void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| const DebugLoc &DL, unsigned DestReg, unsigned SrcReg, |
| bool KillSrc) const override; |
| |
| void storeRegToStackSlot(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MBBI, |
| unsigned SrcReg, bool isKill, int FrameIndex, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const override; |
| |
| void loadRegFromStackSlot(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MBBI, |
| unsigned DestReg, int FrameIndex, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const override; |
| |
| bool expandPostRAPseudo(MachineInstr &MI) const override; |
| |
| bool shouldSink(const MachineInstr &MI) const override; |
| |
| void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, |
| unsigned DestReg, unsigned SubIdx, |
| const MachineInstr &Orig, |
| const TargetRegisterInfo &TRI) const override; |
| |
| MachineInstr & |
| duplicate(MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertBefore, |
| const MachineInstr &Orig) const override; |
| |
| const MachineInstrBuilder &AddDReg(MachineInstrBuilder &MIB, unsigned Reg, |
| unsigned SubIdx, unsigned State, |
| const TargetRegisterInfo *TRI) const; |
| |
| bool produceSameValue(const MachineInstr &MI0, const MachineInstr &MI1, |
| const MachineRegisterInfo *MRI) const override; |
| |
| /// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler to |
| /// determine if two loads are loading from the same base address. It should |
| /// only return true if the base pointers are the same and the only |
| /// differences between the two addresses is the offset. It also returns the |
| /// offsets by reference. |
| bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2, int64_t &Offset1, |
| int64_t &Offset2) const override; |
| |
| /// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to |
| /// determine (in conjunction with areLoadsFromSameBasePtr) if two loads |
| /// should be scheduled togther. On some targets if two loads are loading from |
| /// addresses in the same cache line, it's better if they are scheduled |
| /// together. This function takes two integers that represent the load offsets |
| /// from the common base address. It returns true if it decides it's desirable |
| /// to schedule the two loads together. "NumLoads" is the number of loads that |
| /// have already been scheduled after Load1. |
| bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2, |
| int64_t Offset1, int64_t Offset2, |
| unsigned NumLoads) const override; |
| |
| bool isSchedulingBoundary(const MachineInstr &MI, |
| const MachineBasicBlock *MBB, |
| const MachineFunction &MF) const override; |
| |
| bool isProfitableToIfCvt(MachineBasicBlock &MBB, |
| unsigned NumCycles, unsigned ExtraPredCycles, |
| BranchProbability Probability) const override; |
| |
| bool isProfitableToIfCvt(MachineBasicBlock &TMBB, unsigned NumT, |
| unsigned ExtraT, MachineBasicBlock &FMBB, |
| unsigned NumF, unsigned ExtraF, |
| BranchProbability Probability) const override; |
| |
| bool isProfitableToDupForIfCvt(MachineBasicBlock &MBB, unsigned NumCycles, |
| BranchProbability Probability) const override { |
| return NumCycles == 1; |
| } |
| |
| bool isProfitableToUnpredicate(MachineBasicBlock &TMBB, |
| MachineBasicBlock &FMBB) const override; |
| |
| /// analyzeCompare - For a comparison instruction, return the source registers |
| /// in SrcReg and SrcReg2 if having two register operands, and the value it |
| /// compares against in CmpValue. Return true if the comparison instruction |
| /// can be analyzed. |
| bool analyzeCompare(const MachineInstr &MI, unsigned &SrcReg, |
| unsigned &SrcReg2, int &CmpMask, |
| int &CmpValue) const override; |
| |
| /// optimizeCompareInstr - Convert the instruction to set the zero flag so |
| /// that we can remove a "comparison with zero"; Remove a redundant CMP |
| /// instruction if the flags can be updated in the same way by an earlier |
| /// instruction such as SUB. |
| bool optimizeCompareInstr(MachineInstr &CmpInstr, unsigned SrcReg, |
| unsigned SrcReg2, int CmpMask, int CmpValue, |
| const MachineRegisterInfo *MRI) const override; |
| |
| bool analyzeSelect(const MachineInstr &MI, |
| SmallVectorImpl<MachineOperand> &Cond, unsigned &TrueOp, |
| unsigned &FalseOp, bool &Optimizable) const override; |
| |
| MachineInstr *optimizeSelect(MachineInstr &MI, |
| SmallPtrSetImpl<MachineInstr *> &SeenMIs, |
| bool) const override; |
| |
| /// FoldImmediate - 'Reg' is known to be defined by a move immediate |
| /// instruction, try to fold the immediate into the use instruction. |
| bool FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI, unsigned Reg, |
| MachineRegisterInfo *MRI) const override; |
| |
| unsigned getNumMicroOps(const InstrItineraryData *ItinData, |
| const MachineInstr &MI) const override; |
| |
| int getOperandLatency(const InstrItineraryData *ItinData, |
| const MachineInstr &DefMI, unsigned DefIdx, |
| const MachineInstr &UseMI, |
| unsigned UseIdx) const override; |
| int getOperandLatency(const InstrItineraryData *ItinData, |
| SDNode *DefNode, unsigned DefIdx, |
| SDNode *UseNode, unsigned UseIdx) const override; |
| |
| /// VFP/NEON execution domains. |
| std::pair<uint16_t, uint16_t> |
| getExecutionDomain(const MachineInstr &MI) const override; |
| void setExecutionDomain(MachineInstr &MI, unsigned Domain) const override; |
| |
| unsigned |
| getPartialRegUpdateClearance(const MachineInstr &, unsigned, |
| const TargetRegisterInfo *) const override; |
| void breakPartialRegDependency(MachineInstr &, unsigned, |
| const TargetRegisterInfo *TRI) const override; |
| |
| /// Get the number of addresses by LDM or VLDM or zero for unknown. |
| unsigned getNumLDMAddresses(const MachineInstr &MI) const; |
| |
| std::pair<unsigned, unsigned> |
| decomposeMachineOperandsTargetFlags(unsigned TF) const override; |
| ArrayRef<std::pair<unsigned, const char *>> |
| getSerializableDirectMachineOperandTargetFlags() const override; |
| ArrayRef<std::pair<unsigned, const char *>> |
| getSerializableBitmaskMachineOperandTargetFlags() const override; |
| |
| private: |
| unsigned getInstBundleLength(const MachineInstr &MI) const; |
| |
| int getVLDMDefCycle(const InstrItineraryData *ItinData, |
| const MCInstrDesc &DefMCID, |
| unsigned DefClass, |
| unsigned DefIdx, unsigned DefAlign) const; |
| int getLDMDefCycle(const InstrItineraryData *ItinData, |
| const MCInstrDesc &DefMCID, |
| unsigned DefClass, |
| unsigned DefIdx, unsigned DefAlign) const; |
| int getVSTMUseCycle(const InstrItineraryData *ItinData, |
| const MCInstrDesc &UseMCID, |
| unsigned UseClass, |
| unsigned UseIdx, unsigned UseAlign) const; |
| int getSTMUseCycle(const InstrItineraryData *ItinData, |
| const MCInstrDesc &UseMCID, |
| unsigned UseClass, |
| unsigned UseIdx, unsigned UseAlign) const; |
| int getOperandLatency(const InstrItineraryData *ItinData, |
| const MCInstrDesc &DefMCID, |
| unsigned DefIdx, unsigned DefAlign, |
| const MCInstrDesc &UseMCID, |
| unsigned UseIdx, unsigned UseAlign) const; |
| |
| int getOperandLatencyImpl(const InstrItineraryData *ItinData, |
| const MachineInstr &DefMI, unsigned DefIdx, |
| const MCInstrDesc &DefMCID, unsigned DefAdj, |
| const MachineOperand &DefMO, unsigned Reg, |
| const MachineInstr &UseMI, unsigned UseIdx, |
| const MCInstrDesc &UseMCID, unsigned UseAdj) const; |
| |
| unsigned getPredicationCost(const MachineInstr &MI) const override; |
| |
| unsigned getInstrLatency(const InstrItineraryData *ItinData, |
| const MachineInstr &MI, |
| unsigned *PredCost = nullptr) const override; |
| |
| int getInstrLatency(const InstrItineraryData *ItinData, |
| SDNode *Node) const override; |
| |
| bool hasHighOperandLatency(const TargetSchedModel &SchedModel, |
| const MachineRegisterInfo *MRI, |
| const MachineInstr &DefMI, unsigned DefIdx, |
| const MachineInstr &UseMI, |
| unsigned UseIdx) const override; |
| bool hasLowDefLatency(const TargetSchedModel &SchedModel, |
| const MachineInstr &DefMI, |
| unsigned DefIdx) const override; |
| |
| /// verifyInstruction - Perform target specific instruction verification. |
| bool verifyInstruction(const MachineInstr &MI, |
| StringRef &ErrInfo) const override; |
| |
| virtual void expandLoadStackGuard(MachineBasicBlock::iterator MI) const = 0; |
| |
| void expandMEMCPY(MachineBasicBlock::iterator) const; |
| |
| private: |
| /// Modeling special VFP / NEON fp MLA / MLS hazards. |
| |
| /// MLxEntryMap - Map fp MLA / MLS to the corresponding entry in the internal |
| /// MLx table. |
| DenseMap<unsigned, unsigned> MLxEntryMap; |
| |
| /// MLxHazardOpcodes - Set of add / sub and multiply opcodes that would cause |
| /// stalls when scheduled together with fp MLA / MLS opcodes. |
| SmallSet<unsigned, 16> MLxHazardOpcodes; |
| |
| public: |
| /// isFpMLxInstruction - Return true if the specified opcode is a fp MLA / MLS |
| /// instruction. |
| bool isFpMLxInstruction(unsigned Opcode) const { |
| return MLxEntryMap.count(Opcode); |
| } |
| |
| /// isFpMLxInstruction - This version also returns the multiply opcode and the |
| /// addition / subtraction opcode to expand to. Return true for 'HasLane' for |
| /// the MLX instructions with an extra lane operand. |
| bool isFpMLxInstruction(unsigned Opcode, unsigned &MulOpc, |
| unsigned &AddSubOpc, bool &NegAcc, |
| bool &HasLane) const; |
| |
| /// canCauseFpMLxStall - Return true if an instruction of the specified opcode |
| /// will cause stalls when scheduled after (within 4-cycle window) a fp |
| /// MLA / MLS instruction. |
| bool canCauseFpMLxStall(unsigned Opcode) const { |
| return MLxHazardOpcodes.count(Opcode); |
| } |
| |
| /// Returns true if the instruction has a shift by immediate that can be |
| /// executed in one cycle less. |
| bool isSwiftFastImmShift(const MachineInstr *MI) const; |
| |
| /// Returns predicate register associated with the given frame instruction. |
| unsigned getFramePred(const MachineInstr &MI) const { |
| assert(isFrameInstr(MI)); |
| // Operands of ADJCALLSTACKDOWN/ADJCALLSTACKUP: |
| // - argument declared in the pattern: |
| // 0 - frame size |
| // 1 - arg of CALLSEQ_START/CALLSEQ_END |
| // 2 - predicate code (like ARMCC::AL) |
| // - added by predOps: |
| // 3 - predicate reg |
| return MI.getOperand(3).getReg(); |
| } |
| }; |
| |
| /// Get the operands corresponding to the given \p Pred value. By default, the |
| /// predicate register is assumed to be 0 (no register), but you can pass in a |
| /// \p PredReg if that is not the case. |
| static inline std::array<MachineOperand, 2> predOps(ARMCC::CondCodes Pred, |
| unsigned PredReg = 0) { |
| return {{MachineOperand::CreateImm(static_cast<int64_t>(Pred)), |
| MachineOperand::CreateReg(PredReg, false)}}; |
| } |
| |
| /// Get the operand corresponding to the conditional code result. By default, |
| /// this is 0 (no register). |
| static inline MachineOperand condCodeOp(unsigned CCReg = 0) { |
| return MachineOperand::CreateReg(CCReg, false); |
| } |
| |
| /// Get the operand corresponding to the conditional code result for Thumb1. |
| /// This operand will always refer to CPSR and it will have the Define flag set. |
| /// You can optionally set the Dead flag by means of \p isDead. |
| static inline MachineOperand t1CondCodeOp(bool isDead = false) { |
| return MachineOperand::CreateReg(ARM::CPSR, |
| /*Define*/ true, /*Implicit*/ false, |
| /*Kill*/ false, isDead); |
| } |
| |
| static inline |
| bool isUncondBranchOpcode(int Opc) { |
| return Opc == ARM::B || Opc == ARM::tB || Opc == ARM::t2B; |
| } |
| |
| static inline |
| bool isCondBranchOpcode(int Opc) { |
| return Opc == ARM::Bcc || Opc == ARM::tBcc || Opc == ARM::t2Bcc; |
| } |
| |
| static inline bool isJumpTableBranchOpcode(int Opc) { |
| return Opc == ARM::BR_JTr || Opc == ARM::BR_JTm_i12 || |
| Opc == ARM::BR_JTm_rs || Opc == ARM::BR_JTadd || Opc == ARM::tBR_JTr || |
| Opc == ARM::t2BR_JT; |
| } |
| |
| static inline |
| bool isIndirectBranchOpcode(int Opc) { |
| return Opc == ARM::BX || Opc == ARM::MOVPCRX || Opc == ARM::tBRIND; |
| } |
| |
| static inline bool isPopOpcode(int Opc) { |
| return Opc == ARM::tPOP_RET || Opc == ARM::LDMIA_RET || |
| Opc == ARM::t2LDMIA_RET || Opc == ARM::tPOP || Opc == ARM::LDMIA_UPD || |
| Opc == ARM::t2LDMIA_UPD || Opc == ARM::VLDMDIA_UPD; |
| } |
| |
| static inline bool isPushOpcode(int Opc) { |
| return Opc == ARM::tPUSH || Opc == ARM::t2STMDB_UPD || |
| Opc == ARM::STMDB_UPD || Opc == ARM::VSTMDDB_UPD; |
| } |
| |
| /// getInstrPredicate - If instruction is predicated, returns its predicate |
| /// condition, otherwise returns AL. It also returns the condition code |
| /// register by reference. |
| ARMCC::CondCodes getInstrPredicate(const MachineInstr &MI, unsigned &PredReg); |
| |
| unsigned getMatchingCondBranchOpcode(unsigned Opc); |
| |
| /// Determine if MI can be folded into an ARM MOVCC instruction, and return the |
| /// opcode of the SSA instruction representing the conditional MI. |
| unsigned canFoldARMInstrIntoMOVCC(unsigned Reg, |
| MachineInstr *&MI, |
| const MachineRegisterInfo &MRI); |
| |
| /// Map pseudo instructions that imply an 'S' bit onto real opcodes. Whether |
| /// the instruction is encoded with an 'S' bit is determined by the optional |
| /// CPSR def operand. |
| unsigned convertAddSubFlagsOpcode(unsigned OldOpc); |
| |
| /// emitARMRegPlusImmediate / emitT2RegPlusImmediate - Emits a series of |
| /// instructions to materializea destreg = basereg + immediate in ARM / Thumb2 |
| /// code. |
| void emitARMRegPlusImmediate(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator &MBBI, |
| const DebugLoc &dl, unsigned DestReg, |
| unsigned BaseReg, int NumBytes, |
| ARMCC::CondCodes Pred, unsigned PredReg, |
| const ARMBaseInstrInfo &TII, unsigned MIFlags = 0); |
| |
| void emitT2RegPlusImmediate(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator &MBBI, |
| const DebugLoc &dl, unsigned DestReg, |
| unsigned BaseReg, int NumBytes, |
| ARMCC::CondCodes Pred, unsigned PredReg, |
| const ARMBaseInstrInfo &TII, unsigned MIFlags = 0); |
| void emitThumbRegPlusImmediate(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator &MBBI, |
| const DebugLoc &dl, unsigned DestReg, |
| unsigned BaseReg, int NumBytes, |
| const TargetInstrInfo &TII, |
| const ARMBaseRegisterInfo &MRI, |
| unsigned MIFlags = 0); |
| |
| /// Tries to add registers to the reglist of a given base-updating |
| /// push/pop instruction to adjust the stack by an additional |
| /// NumBytes. This can save a few bytes per function in code-size, but |
| /// obviously generates more memory traffic. As such, it only takes |
| /// effect in functions being optimised for size. |
| bool tryFoldSPUpdateIntoPushPop(const ARMSubtarget &Subtarget, |
| MachineFunction &MF, MachineInstr *MI, |
| unsigned NumBytes); |
| |
| /// rewriteARMFrameIndex / rewriteT2FrameIndex - |
| /// Rewrite MI to access 'Offset' bytes from the FP. Return false if the |
| /// offset could not be handled directly in MI, and return the left-over |
| /// portion by reference. |
| bool rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx, |
| unsigned FrameReg, int &Offset, |
| const ARMBaseInstrInfo &TII); |
| |
| bool rewriteT2FrameIndex(MachineInstr &MI, unsigned FrameRegIdx, |
| unsigned FrameReg, int &Offset, |
| const ARMBaseInstrInfo &TII); |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_LIB_TARGET_ARM_ARMBASEINSTRINFO_H |
