//===- ARMBaseInstrInfo.h - ARM Base 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 Base ARM implementation of the TargetInstrInfo class. // //===----------------------------------------------------------------------===// #ifndef ARMBASEINSTRUCTIONINFO_H #define ARMBASEINSTRUCTIONINFO_H #include "ARM.h" #include "ARMRegisterInfo.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/Target/TargetInstrInfo.h" namespace llvm { /// ARMII - This namespace holds all of the target specific flags that /// instruction info tracks. /// namespace ARMII { enum { //===------------------------------------------------------------------===// // Instruction Flags. //===------------------------------------------------------------------===// // This four-bit field describes the addressing mode used. AddrModeMask = 0xf, AddrModeNone = 0, AddrMode1 = 1, AddrMode2 = 2, AddrMode3 = 3, AddrMode4 = 4, AddrMode5 = 5, AddrMode6 = 6, AddrModeT1_1 = 7, AddrModeT1_2 = 8, AddrModeT1_4 = 9, AddrModeT1_s = 10, // i8 * 4 for pc and sp relative data AddrModeT2_i12 = 11, AddrModeT2_i8 = 12, AddrModeT2_so = 13, AddrModeT2_pc = 14, // +/- i12 for pc relative data AddrModeT2_i8s4 = 15, // i8 * 4 // Size* - Flags to keep track of the size of an instruction. SizeShift = 4, SizeMask = 7 << SizeShift, SizeSpecial = 1, // 0 byte pseudo or special case. Size8Bytes = 2, Size4Bytes = 3, Size2Bytes = 4, // IndexMode - Unindex, pre-indexed, or post-indexed. Only valid for load // and store ops IndexModeShift = 7, IndexModeMask = 3 << IndexModeShift, IndexModePre = 1, IndexModePost = 2, //===------------------------------------------------------------------===// // Instruction encoding formats. // FormShift = 9, FormMask = 0x3f << FormShift, // Pseudo instructions Pseudo = 0 << FormShift, // Multiply instructions MulFrm = 1 << FormShift, // Branch instructions BrFrm = 2 << FormShift, BrMiscFrm = 3 << FormShift, // Data Processing instructions DPFrm = 4 << FormShift, DPSoRegFrm = 5 << FormShift, // Load and Store LdFrm = 6 << FormShift, StFrm = 7 << FormShift, LdMiscFrm = 8 << FormShift, StMiscFrm = 9 << FormShift, LdStMulFrm = 10 << FormShift, // Miscellaneous arithmetic instructions ArithMiscFrm = 11 << FormShift, // Extend instructions ExtFrm = 12 << FormShift, // VFP formats VFPUnaryFrm = 13 << FormShift, VFPBinaryFrm = 14 << FormShift, VFPConv1Frm = 15 << FormShift, VFPConv2Frm = 16 << FormShift, VFPConv3Frm = 17 << FormShift, VFPConv4Frm = 18 << FormShift, VFPConv5Frm = 19 << FormShift, VFPLdStFrm = 20 << FormShift, VFPLdStMulFrm = 21 << FormShift, VFPMiscFrm = 22 << FormShift, // Thumb format ThumbFrm = 23 << FormShift, // NEON format NEONFrm = 24 << FormShift, NEONGetLnFrm = 25 << FormShift, NEONSetLnFrm = 26 << FormShift, NEONDupFrm = 27 << FormShift, //===------------------------------------------------------------------===// // Misc flags. // UnaryDP - Indicates this is a unary data processing instruction, i.e. // it doesn't have a Rn operand. UnaryDP = 1 << 15, // Xform16Bit - Indicates this Thumb2 instruction may be transformed into // a 16-bit Thumb instruction if certain conditions are met. Xform16Bit = 1 << 16, //===------------------------------------------------------------------===// // Field shifts - such shifts are used to set field while generating // machine instructions. M_BitShift = 5, ShiftImmShift = 5, ShiftShift = 7, N_BitShift = 7, ImmHiShift = 8, SoRotImmShift = 8, RegRsShift = 8, ExtRotImmShift = 10, RegRdLoShift = 12, RegRdShift = 12, RegRdHiShift = 16, RegRnShift = 16, S_BitShift = 20, W_BitShift = 21, AM3_I_BitShift = 22, D_BitShift = 22, U_BitShift = 23, P_BitShift = 24, I_BitShift = 25, CondShift = 28 }; } class ARMBaseInstrInfo : public TargetInstrInfoImpl { protected: // Can be only subclassed. explicit ARMBaseInstrInfo(); public: // 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; // Return true if the block does not fall through. virtual bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const =0; virtual MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI, MachineBasicBlock::iterator &MBBI, LiveVariables *LV) const; virtual const ARMBaseRegisterInfo &getRegisterInfo() const =0; // Branch analysis. virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, MachineBasicBlock *&FBB, SmallVectorImpl &Cond, bool AllowModify) const; virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const; virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, MachineBasicBlock *FBB, const SmallVectorImpl &Cond) const; virtual bool ReverseBranchCondition(SmallVectorImpl &Cond) const; // Predication support. bool isPredicated(const MachineInstr *MI) const { int PIdx = MI->findFirstPredOperandIdx(); return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL; } ARMCC::CondCodes getPredicate(const MachineInstr *MI) const { int PIdx = MI->findFirstPredOperandIdx(); return PIdx != -1 ? (ARMCC::CondCodes)MI->getOperand(PIdx).getImm() : ARMCC::AL; } virtual bool PredicateInstruction(MachineInstr *MI, const SmallVectorImpl &Pred) const; virtual bool SubsumesPredicate(const SmallVectorImpl &Pred1, const SmallVectorImpl &Pred2) const; virtual bool DefinesPredicate(MachineInstr *MI, std::vector &Pred) const; /// GetInstSize - Returns the size of the specified MachineInstr. /// virtual unsigned GetInstSizeInBytes(const MachineInstr* MI) const; /// Return true if the instruction is a register to register move and return /// the source and dest operands and their sub-register indices by reference. virtual bool isMoveInstr(const MachineInstr &MI, unsigned &SrcReg, unsigned &DstReg, unsigned &SrcSubIdx, unsigned &DstSubIdx) const; virtual unsigned isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const; virtual unsigned isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const; virtual bool copyRegToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, unsigned DestReg, unsigned SrcReg, const TargetRegisterClass *DestRC, const TargetRegisterClass *SrcRC) const; virtual void storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, unsigned SrcReg, bool isKill, int FrameIndex, const TargetRegisterClass *RC) const; virtual void loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, unsigned DestReg, int FrameIndex, const TargetRegisterClass *RC) const; virtual bool canFoldMemoryOperand(const MachineInstr *MI, const SmallVectorImpl &Ops) const; virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF, MachineInstr* MI, const SmallVectorImpl &Ops, int FrameIndex) const; virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF, MachineInstr* MI, const SmallVectorImpl &Ops, MachineInstr* LoadMI) const; }; static inline const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) { return MIB.addImm((int64_t)ARMCC::AL).addReg(0); } static inline const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) { return MIB.addReg(0); } static inline const MachineInstrBuilder &AddDefaultT1CC(const MachineInstrBuilder &MIB, bool isDead = false) { return MIB.addReg(ARM::CPSR, getDefRegState(true) | getDeadRegState(isDead)); } static inline const MachineInstrBuilder &AddNoT1CC(const MachineInstrBuilder &MIB) { return MIB.addReg(0); } 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 || Opc == ARM::BR_JTadd || Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT; } /// getInstrPredicate - If instruction is predicated, returns its predicate /// condition, otherwise returns AL. It also returns the condition code /// register by reference. ARMCC::CondCodes getInstrPredicate(MachineInstr *MI, unsigned &PredReg); int getMatchingCondBranchOpcode(int Opc); /// emitARMRegPlusImmediate / emitT2RegPlusImmediate - Emits a series of /// instructions to materializea destreg = basereg + immediate in ARM / Thumb2 /// code. void emitARMRegPlusImmediate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, DebugLoc dl, unsigned DestReg, unsigned BaseReg, int NumBytes, ARMCC::CondCodes Pred, unsigned PredReg, const ARMBaseInstrInfo &TII); void emitT2RegPlusImmediate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, DebugLoc dl, unsigned DestReg, unsigned BaseReg, int NumBytes, ARMCC::CondCodes Pred, unsigned PredReg, const ARMBaseInstrInfo &TII); /// 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 llvm namespace #endif