1 //===-- MipsInstrInfo.h - Mips Instruction Information ----------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains the Mips implementation of the TargetInstrInfo class. 11 // 12 // FIXME: We need to override TargetInstrInfo::getInlineAsmLength method in 13 // order for MipsLongBranch pass to work correctly when the code has inline 14 // assembly. The returned value doesn't have to be the asm instruction's exact 15 // size in bytes; MipsLongBranch only expects it to be the correct upper bound. 16 //===----------------------------------------------------------------------===// 17 18 #ifndef MIPSINSTRUCTIONINFO_H 19 #define MIPSINSTRUCTIONINFO_H 20 21 #include "Mips.h" 22 #include "MipsAnalyzeImmediate.h" 23 #include "MipsRegisterInfo.h" 24 #include "llvm/CodeGen/MachineInstrBuilder.h" 25 #include "llvm/Support/ErrorHandling.h" 26 #include "llvm/Target/TargetInstrInfo.h" 27 28 #define GET_INSTRINFO_HEADER 29 #include "MipsGenInstrInfo.inc" 30 31 namespace llvm { 32 33 class MipsInstrInfo : public MipsGenInstrInfo { 34 virtual void anchor(); 35 protected: 36 MipsTargetMachine &TM; 37 unsigned UncondBrOpc; 38 39 public: 40 enum BranchType { 41 BT_None, // Couldn't analyze branch. 42 BT_NoBranch, // No branches found. 43 BT_Uncond, // One unconditional branch. 44 BT_Cond, // One conditional branch. 45 BT_CondUncond, // A conditional branch followed by an unconditional branch. 46 BT_Indirect // One indirct branch. 47 }; 48 49 explicit MipsInstrInfo(MipsTargetMachine &TM, unsigned UncondBrOpc); 50 51 static const MipsInstrInfo *create(MipsTargetMachine &TM); 52 53 /// Branch Analysis 54 bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, 55 MachineBasicBlock *&FBB, 56 SmallVectorImpl<MachineOperand> &Cond, 57 bool AllowModify) const override; 58 59 unsigned RemoveBranch(MachineBasicBlock &MBB) const override; 60 61 unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, 62 MachineBasicBlock *FBB, 63 const SmallVectorImpl<MachineOperand> &Cond, 64 DebugLoc DL) const override; 65 66 bool 67 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override; 68 69 BranchType AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, 70 MachineBasicBlock *&FBB, 71 SmallVectorImpl<MachineOperand> &Cond, 72 bool AllowModify, 73 SmallVectorImpl<MachineInstr*> &BranchInstrs) const; 74 75 /// Insert nop instruction when hazard condition is found 76 void insertNoop(MachineBasicBlock &MBB, 77 MachineBasicBlock::iterator MI) const override; 78 79 /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As 80 /// such, whenever a client has an instance of instruction info, it should 81 /// always be able to get register info as well (through this method). 82 /// 83 virtual const MipsRegisterInfo &getRegisterInfo() const = 0; 84 85 virtual unsigned getOppositeBranchOpc(unsigned Opc) const = 0; 86 87 /// Return the number of bytes of code the specified instruction may be. 88 unsigned GetInstSizeInBytes(const MachineInstr *MI) const; 89 90 void storeRegToStackSlot(MachineBasicBlock &MBB, 91 MachineBasicBlock::iterator MBBI, 92 unsigned SrcReg, bool isKill, int FrameIndex, 93 const TargetRegisterClass *RC, 94 const TargetRegisterInfo *TRI) const override { 95 storeRegToStack(MBB, MBBI, SrcReg, isKill, FrameIndex, RC, TRI, 0); 96 } 97 98 void loadRegFromStackSlot(MachineBasicBlock &MBB, 99 MachineBasicBlock::iterator MBBI, 100 unsigned DestReg, int FrameIndex, 101 const TargetRegisterClass *RC, 102 const TargetRegisterInfo *TRI) const override { 103 loadRegFromStack(MBB, MBBI, DestReg, FrameIndex, RC, TRI, 0); 104 } 105 106 virtual void storeRegToStack(MachineBasicBlock &MBB, 107 MachineBasicBlock::iterator MI, 108 unsigned SrcReg, bool isKill, int FrameIndex, 109 const TargetRegisterClass *RC, 110 const TargetRegisterInfo *TRI, 111 int64_t Offset) const = 0; 112 113 virtual void loadRegFromStack(MachineBasicBlock &MBB, 114 MachineBasicBlock::iterator MI, 115 unsigned DestReg, int FrameIndex, 116 const TargetRegisterClass *RC, 117 const TargetRegisterInfo *TRI, 118 int64_t Offset) const = 0; 119 120 /// Create an instruction which has the same operands and memory operands 121 /// as MI but has a new opcode. 122 MachineInstrBuilder genInstrWithNewOpc(unsigned NewOpc, 123 MachineBasicBlock::iterator I) const; 124 125 protected: 126 bool isZeroImm(const MachineOperand &op) const; 127 128 MachineMemOperand *GetMemOperand(MachineBasicBlock &MBB, int FI, 129 unsigned Flag) const; 130 131 private: 132 virtual unsigned getAnalyzableBrOpc(unsigned Opc) const = 0; 133 134 void AnalyzeCondBr(const MachineInstr *Inst, unsigned Opc, 135 MachineBasicBlock *&BB, 136 SmallVectorImpl<MachineOperand> &Cond) const; 137 138 void BuildCondBr(MachineBasicBlock &MBB, MachineBasicBlock *TBB, DebugLoc DL, 139 const SmallVectorImpl<MachineOperand>& Cond) const; 140 }; 141 142 /// Create MipsInstrInfo objects. 143 const MipsInstrInfo *createMips16InstrInfo(MipsTargetMachine &TM); 144 const MipsInstrInfo *createMipsSEInstrInfo(MipsTargetMachine &TM); 145 146 } 147 148 #endif 149
