1 //===-- ARMBaseRegisterInfo.h - ARM Register Information Impl ---*- 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 base ARM implementation of TargetRegisterInfo class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef ARMBASEREGISTERINFO_H 15 #define ARMBASEREGISTERINFO_H 16 17 #include "ARM.h" 18 #include "llvm/Target/TargetRegisterInfo.h" 19 20 #define GET_REGINFO_HEADER 21 #include "ARMGenRegisterInfo.inc" 22 23 namespace llvm { 24 class ARMSubtarget; 25 class ARMBaseInstrInfo; 26 class Type; 27 28 /// Register allocation hints. 29 namespace ARMRI { 30 enum { 31 RegPairOdd = 1, 32 RegPairEven = 2 33 }; 34 } 35 36 /// isARMArea1Register - Returns true if the register is a low register (r0-r7) 37 /// or a stack/pc register that we should push/pop. 38 static inline bool isARMArea1Register(unsigned Reg, bool isIOS) { 39 using namespace ARM; 40 switch (Reg) { 41 case R0: case R1: case R2: case R3: 42 case R4: case R5: case R6: case R7: 43 case LR: case SP: case PC: 44 return true; 45 case R8: case R9: case R10: case R11: 46 // For iOS we want r7 and lr to be next to each other. 47 return !isIOS; 48 default: 49 return false; 50 } 51 } 52 53 static inline bool isARMArea2Register(unsigned Reg, bool isIOS) { 54 using namespace ARM; 55 switch (Reg) { 56 case R8: case R9: case R10: case R11: 57 // iOS has this second area. 58 return isIOS; 59 default: 60 return false; 61 } 62 } 63 64 static inline bool isARMArea3Register(unsigned Reg, bool isIOS) { 65 using namespace ARM; 66 switch (Reg) { 67 case D15: case D14: case D13: case D12: 68 case D11: case D10: case D9: case D8: 69 return true; 70 default: 71 return false; 72 } 73 } 74 75 class ARMBaseRegisterInfo : public ARMGenRegisterInfo { 76 protected: 77 const ARMBaseInstrInfo &TII; 78 const ARMSubtarget &STI; 79 80 /// FramePtr - ARM physical register used as frame ptr. 81 unsigned FramePtr; 82 83 /// BasePtr - ARM physical register used as a base ptr in complex stack 84 /// frames. I.e., when we need a 3rd base, not just SP and FP, due to 85 /// variable size stack objects. 86 unsigned BasePtr; 87 88 // Can be only subclassed. 89 explicit ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii, 90 const ARMSubtarget &STI); 91 92 // Return the opcode that implements 'Op', or 0 if no opcode 93 unsigned getOpcode(int Op) const; 94 95 public: 96 /// Code Generation virtual methods... 97 const uint16_t *getCalleeSavedRegs(const MachineFunction *MF = 0) const; 98 const uint32_t *getCallPreservedMask(CallingConv::ID) const; 99 100 BitVector getReservedRegs(const MachineFunction &MF) const; 101 102 /// canCombineSubRegIndices - Given a register class and a list of 103 /// subregister indices, return true if it's possible to combine the 104 /// subregister indices into one that corresponds to a larger 105 /// subregister. Return the new subregister index by reference. Note the 106 /// new index may be zero if the given subregisters can be combined to 107 /// form the whole register. 108 virtual bool canCombineSubRegIndices(const TargetRegisterClass *RC, 109 SmallVectorImpl<unsigned> &SubIndices, 110 unsigned &NewSubIdx) const; 111 112 const TargetRegisterClass *getPointerRegClass(unsigned Kind = 0) const; 113 const TargetRegisterClass* 114 getCrossCopyRegClass(const TargetRegisterClass *RC) const; 115 116 const TargetRegisterClass* 117 getLargestLegalSuperClass(const TargetRegisterClass *RC) const; 118 119 unsigned getRegPressureLimit(const TargetRegisterClass *RC, 120 MachineFunction &MF) const; 121 122 ArrayRef<uint16_t> getRawAllocationOrder(const TargetRegisterClass *RC, 123 unsigned HintType, unsigned HintReg, 124 const MachineFunction &MF) const; 125 126 unsigned ResolveRegAllocHint(unsigned Type, unsigned Reg, 127 const MachineFunction &MF) const; 128 129 void UpdateRegAllocHint(unsigned Reg, unsigned NewReg, 130 MachineFunction &MF) const; 131 132 virtual bool avoidWriteAfterWrite(const TargetRegisterClass *RC) const; 133 134 bool hasBasePointer(const MachineFunction &MF) const; 135 136 bool canRealignStack(const MachineFunction &MF) const; 137 bool needsStackRealignment(const MachineFunction &MF) const; 138 int64_t getFrameIndexInstrOffset(const MachineInstr *MI, int Idx) const; 139 bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const; 140 void materializeFrameBaseRegister(MachineBasicBlock *MBB, 141 unsigned BaseReg, int FrameIdx, 142 int64_t Offset) const; 143 void resolveFrameIndex(MachineBasicBlock::iterator I, 144 unsigned BaseReg, int64_t Offset) const; 145 bool isFrameOffsetLegal(const MachineInstr *MI, int64_t Offset) const; 146 147 bool cannotEliminateFrame(const MachineFunction &MF) const; 148 149 // Debug information queries. 150 unsigned getFrameRegister(const MachineFunction &MF) const; 151 unsigned getBaseRegister() const { return BasePtr; } 152 153 // Exception handling queries. 154 unsigned getEHExceptionRegister() const; 155 unsigned getEHHandlerRegister() const; 156 157 bool isLowRegister(unsigned Reg) const; 158 159 160 /// emitLoadConstPool - Emits a load from constpool to materialize the 161 /// specified immediate. 162 virtual void emitLoadConstPool(MachineBasicBlock &MBB, 163 MachineBasicBlock::iterator &MBBI, 164 DebugLoc dl, 165 unsigned DestReg, unsigned SubIdx, 166 int Val, 167 ARMCC::CondCodes Pred = ARMCC::AL, 168 unsigned PredReg = 0, 169 unsigned MIFlags = MachineInstr::NoFlags)const; 170 171 /// Code Generation virtual methods... 172 virtual bool isReservedReg(const MachineFunction &MF, unsigned Reg) const; 173 174 virtual bool requiresRegisterScavenging(const MachineFunction &MF) const; 175 176 virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const; 177 178 virtual bool requiresVirtualBaseRegisters(const MachineFunction &MF) const; 179 180 virtual void eliminateCallFramePseudoInstr(MachineFunction &MF, 181 MachineBasicBlock &MBB, 182 MachineBasicBlock::iterator I) const; 183 184 virtual void eliminateFrameIndex(MachineBasicBlock::iterator II, 185 int SPAdj, RegScavenger *RS = NULL) const; 186 187 private: 188 unsigned getRegisterPairEven(unsigned Reg, const MachineFunction &MF) const; 189 190 unsigned getRegisterPairOdd(unsigned Reg, const MachineFunction &MF) const; 191 }; 192 193 } // end namespace llvm 194 195 #endif 196
