| //===- AArch64InstrInfo.h - AArch64 Instruction Information -----*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains the AArch64 implementation of the TargetInstrInfo class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TARGET_AArch64INSTRINFO_H |
| #define LLVM_TARGET_AArch64INSTRINFO_H |
| |
| #include "AArch64.h" |
| #include "AArch64RegisterInfo.h" |
| #include "llvm/Target/TargetInstrInfo.h" |
| |
| #define GET_INSTRINFO_HEADER |
| #include "AArch64GenInstrInfo.inc" |
| |
| namespace llvm { |
| |
| class AArch64Subtarget; |
| class AArch64TargetMachine; |
| |
| class AArch64InstrInfo : public AArch64GenInstrInfo { |
| // Reserve bits in the MachineMemOperand target hint flags, starting at 1. |
| // They will be shifted into MOTargetHintStart when accessed. |
| enum TargetMemOperandFlags { |
| MOSuppressPair = 1 |
| }; |
| |
| const AArch64RegisterInfo RI; |
| const AArch64Subtarget &Subtarget; |
| |
| public: |
| explicit AArch64InstrInfo(const AArch64Subtarget &STI); |
| |
| /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As |
| /// such, whenever a client has an instance of instruction info, it should |
| /// always be able to get register info as well (through this method). |
| const AArch64RegisterInfo &getRegisterInfo() const { return RI; } |
| |
| unsigned GetInstSizeInBytes(const MachineInstr *MI) const; |
| |
| bool isAsCheapAsAMove(const MachineInstr *MI) const override; |
| |
| bool isCoalescableExtInstr(const MachineInstr &MI, unsigned &SrcReg, |
| unsigned &DstReg, unsigned &SubIdx) const override; |
| |
| unsigned isLoadFromStackSlot(const MachineInstr *MI, |
| int &FrameIndex) const override; |
| unsigned isStoreToStackSlot(const MachineInstr *MI, |
| int &FrameIndex) const override; |
| |
| /// Returns true if there is a shiftable register and that the shift value |
| /// is non-zero. |
| bool hasShiftedReg(const MachineInstr *MI) const; |
| |
| /// Returns true if there is an extendable register and that the extending |
| /// value is non-zero. |
| bool hasExtendedReg(const MachineInstr *MI) const; |
| |
| /// \brief Does this instruction set its full destination register to zero? |
| bool isGPRZero(const MachineInstr *MI) const; |
| |
| /// \brief Does this instruction rename a GPR without modifying bits? |
| bool isGPRCopy(const MachineInstr *MI) const; |
| |
| /// \brief Does this instruction rename an FPR without modifying bits? |
| bool isFPRCopy(const MachineInstr *MI) const; |
| |
| /// Return true if this is load/store scales or extends its register offset. |
| /// This refers to scaling a dynamic index as opposed to scaled immediates. |
| /// MI should be a memory op that allows scaled addressing. |
| bool isScaledAddr(const MachineInstr *MI) const; |
| |
| /// Return true if pairing the given load or store is hinted to be |
| /// unprofitable. |
| bool isLdStPairSuppressed(const MachineInstr *MI) const; |
| |
| /// Hint that pairing the given load or store is unprofitable. |
| void suppressLdStPair(MachineInstr *MI) const; |
| |
| bool getLdStBaseRegImmOfs(MachineInstr *LdSt, unsigned &BaseReg, |
| unsigned &Offset, |
| const TargetRegisterInfo *TRI) const override; |
| |
| bool enableClusterLoads() const override { return true; } |
| |
| bool shouldClusterLoads(MachineInstr *FirstLdSt, MachineInstr *SecondLdSt, |
| unsigned NumLoads) const override; |
| |
| bool shouldScheduleAdjacent(MachineInstr *First, |
| MachineInstr *Second) const override; |
| |
| MachineInstr *emitFrameIndexDebugValue(MachineFunction &MF, int FrameIx, |
| uint64_t Offset, const MDNode *MDPtr, |
| DebugLoc DL) const; |
| void copyPhysRegTuple(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| DebugLoc DL, unsigned DestReg, unsigned SrcReg, |
| bool KillSrc, unsigned Opcode, |
| llvm::ArrayRef<unsigned> Indices) const; |
| void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| 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; |
| |
| MachineInstr * |
| foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI, |
| const SmallVectorImpl<unsigned> &Ops, |
| int FrameIndex) const override; |
| |
| bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, |
| MachineBasicBlock *&FBB, |
| SmallVectorImpl<MachineOperand> &Cond, |
| bool AllowModify = false) const override; |
| unsigned RemoveBranch(MachineBasicBlock &MBB) const override; |
| unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, |
| MachineBasicBlock *FBB, |
| const SmallVectorImpl<MachineOperand> &Cond, |
| DebugLoc DL) const override; |
| bool |
| ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override; |
| bool canInsertSelect(const MachineBasicBlock &, |
| const SmallVectorImpl<MachineOperand> &Cond, unsigned, |
| unsigned, int &, int &, int &) const override; |
| void insertSelect(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, |
| DebugLoc DL, unsigned DstReg, |
| const SmallVectorImpl<MachineOperand> &Cond, |
| unsigned TrueReg, unsigned FalseReg) const override; |
| void getNoopForMachoTarget(MCInst &NopInst) const override; |
| |
| /// analyzeCompare - For a comparison instruction, return the source registers |
| /// in SrcReg and SrcReg2, 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 supplying the argument to |
| /// the comparison into one that sets the zero bit in the flags register. |
| bool optimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg, |
| unsigned SrcReg2, int CmpMask, int CmpValue, |
| const MachineRegisterInfo *MRI) const override; |
| |
| private: |
| void instantiateCondBranch(MachineBasicBlock &MBB, DebugLoc DL, |
| MachineBasicBlock *TBB, |
| const SmallVectorImpl<MachineOperand> &Cond) const; |
| }; |
| |
| /// emitFrameOffset - Emit instructions as needed to set DestReg to SrcReg |
| /// plus Offset. This is intended to be used from within the prolog/epilog |
| /// insertion (PEI) pass, where a virtual scratch register may be allocated |
| /// if necessary, to be replaced by the scavenger at the end of PEI. |
| void emitFrameOffset(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, |
| DebugLoc DL, unsigned DestReg, unsigned SrcReg, int Offset, |
| const TargetInstrInfo *TII, |
| MachineInstr::MIFlag = MachineInstr::NoFlags, |
| bool SetNZCV = false); |
| |
| /// rewriteAArch64FrameIndex - 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 rewriteAArch64FrameIndex(MachineInstr &MI, unsigned FrameRegIdx, |
| unsigned FrameReg, int &Offset, |
| const AArch64InstrInfo *TII); |
| |
| /// \brief Use to report the frame offset status in isAArch64FrameOffsetLegal. |
| enum AArch64FrameOffsetStatus { |
| AArch64FrameOffsetCannotUpdate = 0x0, ///< Offset cannot apply. |
| AArch64FrameOffsetIsLegal = 0x1, ///< Offset is legal. |
| AArch64FrameOffsetCanUpdate = 0x2 ///< Offset can apply, at least partly. |
| }; |
| |
| /// \brief Check if the @p Offset is a valid frame offset for @p MI. |
| /// The returned value reports the validity of the frame offset for @p MI. |
| /// It uses the values defined by AArch64FrameOffsetStatus for that. |
| /// If result == AArch64FrameOffsetCannotUpdate, @p MI cannot be updated to |
| /// use an offset.eq |
| /// If result & AArch64FrameOffsetIsLegal, @p Offset can completely be |
| /// rewriten in @p MI. |
| /// If result & AArch64FrameOffsetCanUpdate, @p Offset contains the |
| /// amount that is off the limit of the legal offset. |
| /// If set, @p OutUseUnscaledOp will contain the whether @p MI should be |
| /// turned into an unscaled operator, which opcode is in @p OutUnscaledOp. |
| /// If set, @p EmittableOffset contains the amount that can be set in @p MI |
| /// (possibly with @p OutUnscaledOp if OutUseUnscaledOp is true) and that |
| /// is a legal offset. |
| int isAArch64FrameOffsetLegal(const MachineInstr &MI, int &Offset, |
| bool *OutUseUnscaledOp = nullptr, |
| unsigned *OutUnscaledOp = nullptr, |
| int *EmittableOffset = nullptr); |
| |
| static inline bool isUncondBranchOpcode(int Opc) { return Opc == AArch64::B; } |
| |
| static inline bool isCondBranchOpcode(int Opc) { |
| switch (Opc) { |
| case AArch64::Bcc: |
| case AArch64::CBZW: |
| case AArch64::CBZX: |
| case AArch64::CBNZW: |
| case AArch64::CBNZX: |
| case AArch64::TBZW: |
| case AArch64::TBZX: |
| case AArch64::TBNZW: |
| case AArch64::TBNZX: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static inline bool isIndirectBranchOpcode(int Opc) { return Opc == AArch64::BR; } |
| |
| } // end namespace llvm |
| |
| #endif |