1 //===-- ARMBaseRegisterInfo.h - ARM Register Information Impl ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the base ARM implementation of TargetRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_ARM_ARMBASEREGISTERINFO_H
15 #define LLVM_LIB_TARGET_ARM_ARMBASEREGISTERINFO_H
17 #include "MCTargetDesc/ARMBaseInfo.h"
18 #include "llvm/CodeGen/MachineBasicBlock.h"
19 #include "llvm/CodeGen/MachineInstr.h"
20 #include "llvm/IR/CallingConv.h"
21 #include "llvm/MC/MCRegisterInfo.h"
22 #include "llvm/Target/TargetRegisterInfo.h"
25 #define GET_REGINFO_HEADER
26 #include "ARMGenRegisterInfo.inc"
30 /// Register allocation hints.
38 } // end namespace ARMRI
40 /// isARMArea1Register - Returns true if the register is a low register (r0-r7)
41 /// or a stack/pc register that we should push/pop.
42 static inline bool isARMArea1Register(unsigned Reg, bool isIOS) {
46 case R0: case R1: case R2: case R3:
47 case R4: case R5: case R6: case R7:
48 case LR: case SP: case PC:
50 case R8: case R9: case R10: case R11: case R12:
51 // For iOS we want r7 and lr to be next to each other.
58 static inline bool isARMArea2Register(unsigned Reg, bool isIOS) {
62 case R8: case R9: case R10: case R11: case R12:
63 // iOS has this second area.
70 static inline bool isARMArea3Register(unsigned Reg, bool isIOS) {
74 case D15: case D14: case D13: case D12:
75 case D11: case D10: case D9: case D8:
76 case D7: case D6: case D5: case D4:
77 case D3: case D2: case D1: case D0:
78 case D31: case D30: case D29: case D28:
79 case D27: case D26: case D25: case D24:
80 case D23: case D22: case D21: case D20:
81 case D19: case D18: case D17: case D16:
88 static inline bool isCalleeSavedRegister(unsigned Reg,
89 const MCPhysReg *CSRegs) {
90 for (unsigned i = 0; CSRegs[i]; ++i)
96 class ARMBaseRegisterInfo : public ARMGenRegisterInfo {
98 /// BasePtr - ARM physical register used as a base ptr in complex stack
99 /// frames. I.e., when we need a 3rd base, not just SP and FP, due to
100 /// variable size stack objects.
101 unsigned BasePtr = ARM::R6;
103 // Can be only subclassed.
104 explicit ARMBaseRegisterInfo();
106 // Return the opcode that implements 'Op', or 0 if no opcode
107 unsigned getOpcode(int Op) const;
110 /// Code Generation virtual methods...
111 const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
113 getCalleeSavedRegsViaCopy(const MachineFunction *MF) const;
114 const uint32_t *getCallPreservedMask(const MachineFunction &MF,
115 CallingConv::ID) const override;
116 const uint32_t *getNoPreservedMask() const override;
117 const uint32_t *getTLSCallPreservedMask(const MachineFunction &MF) const;
118 const uint32_t *getSjLjDispatchPreservedMask(const MachineFunction &MF) const;
120 /// getThisReturnPreservedMask - Returns a call preserved mask specific to the
121 /// case that 'returned' is on an i32 first argument if the calling convention
122 /// is one that can (partially) model this attribute with a preserved mask
123 /// (i.e. it is a calling convention that uses the same register for the first
124 /// i32 argument and an i32 return value)
126 /// Should return NULL in the case that the calling convention does not have
128 const uint32_t *getThisReturnPreservedMask(const MachineFunction &MF,
129 CallingConv::ID) const;
131 BitVector getReservedRegs(const MachineFunction &MF) const override;
133 const TargetRegisterClass *
134 getPointerRegClass(const MachineFunction &MF,
135 unsigned Kind = 0) const override;
136 const TargetRegisterClass *
137 getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
139 const TargetRegisterClass *
140 getLargestLegalSuperClass(const TargetRegisterClass *RC,
141 const MachineFunction &MF) const override;
143 unsigned getRegPressureLimit(const TargetRegisterClass *RC,
144 MachineFunction &MF) const override;
146 void getRegAllocationHints(unsigned VirtReg,
147 ArrayRef<MCPhysReg> Order,
148 SmallVectorImpl<MCPhysReg> &Hints,
149 const MachineFunction &MF,
150 const VirtRegMap *VRM,
151 const LiveRegMatrix *Matrix) const override;
153 void updateRegAllocHint(unsigned Reg, unsigned NewReg,
154 MachineFunction &MF) const override;
156 bool hasBasePointer(const MachineFunction &MF) const;
158 bool canRealignStack(const MachineFunction &MF) const override;
159 int64_t getFrameIndexInstrOffset(const MachineInstr *MI,
160 int Idx) const override;
161 bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const override;
162 void materializeFrameBaseRegister(MachineBasicBlock *MBB,
163 unsigned BaseReg, int FrameIdx,
164 int64_t Offset) const override;
165 void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
166 int64_t Offset) const override;
167 bool isFrameOffsetLegal(const MachineInstr *MI, unsigned BaseReg,
168 int64_t Offset) const override;
170 bool cannotEliminateFrame(const MachineFunction &MF) const;
172 // Debug information queries.
173 unsigned getFrameRegister(const MachineFunction &MF) const override;
174 unsigned getBaseRegister() const { return BasePtr; }
176 bool isLowRegister(unsigned Reg) const;
179 /// emitLoadConstPool - Emits a load from constpool to materialize the
180 /// specified immediate.
182 emitLoadConstPool(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
183 const DebugLoc &dl, unsigned DestReg, unsigned SubIdx,
184 int Val, ARMCC::CondCodes Pred = ARMCC::AL,
185 unsigned PredReg = 0,
186 unsigned MIFlags = MachineInstr::NoFlags) const;
188 /// Code Generation virtual methods...
189 bool requiresRegisterScavenging(const MachineFunction &MF) const override;
191 bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override;
193 bool requiresFrameIndexScavenging(const MachineFunction &MF) const override;
195 bool requiresVirtualBaseRegisters(const MachineFunction &MF) const override;
197 void eliminateFrameIndex(MachineBasicBlock::iterator II,
198 int SPAdj, unsigned FIOperandNum,
199 RegScavenger *RS = nullptr) const override;
201 /// \brief SrcRC and DstRC will be morphed into NewRC if this returns true
202 bool shouldCoalesce(MachineInstr *MI,
203 const TargetRegisterClass *SrcRC,
205 const TargetRegisterClass *DstRC,
207 const TargetRegisterClass *NewRC) const override;
210 } // end namespace llvm
212 #endif // LLVM_LIB_TARGET_ARM_ARMBASEREGISTERINFO_H