LLVM  8.0.0svn
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1 //==- AArch64RegisterInfo.h - AArch64 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 AArch64 implementation of the MRegisterInfo class.
11 //
12 //===----------------------------------------------------------------------===//
18 #include "AArch64GenRegisterInfo.inc"
20 namespace llvm {
22 class MachineFunction;
23 class RegScavenger;
24 class TargetRegisterClass;
25 class Triple;
28  const Triple &TT;
30 public:
31  AArch64RegisterInfo(const Triple &TT);
33  bool isReservedReg(const MachineFunction &MF, unsigned Reg) const;
34  bool isAnyArgRegReserved(const MachineFunction &MF) const;
35  void emitReservedArgRegCallError(const MachineFunction &MF) const;
39  const uint32_t **Mask) const;
41  /// Code Generation virtual methods...
42  const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
43  const MCPhysReg *
46  CallingConv::ID) const override;
48  unsigned getCSRFirstUseCost() const override {
49  // The cost will be compared against BlockFrequency where entry has the
50  // value of 1 << 14. A value of 5 will choose to spill or split really
51  // cold path instead of using a callee-saved register.
52  return 5;
53  }
55  const TargetRegisterClass *
57  unsigned Idx) const override;
59  // Calls involved in thread-local variable lookup save more registers than
60  // normal calls, so they need a different mask to represent this.
61  const uint32_t *getTLSCallPreservedMask() const;
63  /// getThisReturnPreservedMask - Returns a call preserved mask specific to the
64  /// case that 'returned' is on an i64 first argument if the calling convention
65  /// is one that can (partially) model this attribute with a preserved mask
66  /// (i.e. it is a calling convention that uses the same register for the first
67  /// i64 argument and an i64 return value)
68  ///
69  /// Should return NULL in the case that the calling convention does not have
70  /// this property
72  CallingConv::ID) const;
74  /// Stack probing calls preserve different CSRs to the normal CC.
77  BitVector getReservedRegs(const MachineFunction &MF) const override;
78  bool isAsmClobberable(const MachineFunction &MF,
79  unsigned PhysReg) const override;
80  bool isConstantPhysReg(unsigned PhysReg) const override;
81  const TargetRegisterClass *
83  unsigned Kind = 0) const override;
84  const TargetRegisterClass *
85  getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
87  bool requiresRegisterScavenging(const MachineFunction &MF) const override;
88  bool useFPForScavengingIndex(const MachineFunction &MF) const override;
89  bool requiresFrameIndexScavenging(const MachineFunction &MF) const override;
91  bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const override;
92  bool isFrameOffsetLegal(const MachineInstr *MI, unsigned BaseReg,
93  int64_t Offset) const override;
94  void materializeFrameBaseRegister(MachineBasicBlock *MBB, unsigned BaseReg,
95  int FrameIdx,
96  int64_t Offset) const override;
97  void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
98  int64_t Offset) const override;
100  unsigned FIOperandNum,
101  RegScavenger *RS = nullptr) const override;
102  bool cannotEliminateFrame(const MachineFunction &MF) const;
104  bool requiresVirtualBaseRegisters(const MachineFunction &MF) const override;
105  bool hasBasePointer(const MachineFunction &MF) const;
106  unsigned getBaseRegister() const;
108  // Debug information queries.
109  unsigned getFrameRegister(const MachineFunction &MF) const override;
111  unsigned getRegPressureLimit(const TargetRegisterClass *RC,
112  MachineFunction &MF) const override;
114  bool trackLivenessAfterRegAlloc(const MachineFunction&) const override {
115  return true;
116  }
117 };
119 } // end namespace llvm
121 #endif
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
bool cannotEliminateFrame(const MachineFunction &MF) const
unsigned Reg
bool isFrameOffsetLegal(const MachineInstr *MI, unsigned BaseReg, int64_t Offset) const override
bool isAnyArgRegReserved(const MachineFunction &MF) const
unsigned getCSRFirstUseCost() const override
unsigned getFrameRegister(const MachineFunction &MF) const override
bool requiresFrameIndexScavenging(const MachineFunction &MF) const override
AArch64RegisterInfo(const Triple &TT)
const uint32_t * getCallPreservedMask(const MachineFunction &MF, CallingConv::ID) const override
uint16_t MCPhysReg
An unsigned integer type large enough to represent all physical registers, but not necessarily virtua...
void materializeFrameBaseRegister(MachineBasicBlock *MBB, unsigned BaseReg, int FrameIdx, int64_t Offset) const override
Insert defining instruction(s) for BaseReg to be a pointer to FrameIdx at the beginning of the basic ...
const TargetRegisterClass * getPointerRegClass(const MachineFunction &MF, unsigned Kind=0) const override
void eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj, unsigned FIOperandNum, RegScavenger *RS=nullptr) const override
const uint32_t * getThisReturnPreservedMask(const MachineFunction &MF, CallingConv::ID) const
getThisReturnPreservedMask - Returns a call preserved mask specific to the case that &#39;returned&#39; is on...
const MCPhysReg * getCalleeSavedRegsViaCopy(const MachineFunction *MF) const
const MCPhysReg * getCalleeSavedRegs(const MachineFunction *MF) const override
Code Generation virtual methods...
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg, int64_t Offset) const override
const TargetRegisterClass * getSubClassWithSubReg(const TargetRegisterClass *RC, unsigned Idx) const override
void UpdateCustomCallPreservedMask(MachineFunction &MF, const uint32_t **Mask) const
const uint32_t * getWindowsStackProbePreservedMask() const
Stack probing calls preserve different CSRs to the normal CC.
bool isReservedReg(const MachineFunction &MF, unsigned Reg) const
Representation of each machine instruction.
Definition: MachineInstr.h:64
BitVector getReservedRegs(const MachineFunction &MF) const override
void UpdateCustomCalleeSavedRegs(MachineFunction &MF) const
bool requiresVirtualBaseRegisters(const MachineFunction &MF) const override
void emitReservedArgRegCallError(const MachineFunction &MF) const
bool useFPForScavengingIndex(const MachineFunction &MF) const override
bool trackLivenessAfterRegAlloc(const MachineFunction &) const override
bool requiresRegisterScavenging(const MachineFunction &MF) const override
const uint32_t * getTLSCallPreservedMask() const
unsigned getRegPressureLimit(const TargetRegisterClass *RC, MachineFunction &MF) const override
const unsigned Kind
bool isConstantPhysReg(unsigned PhysReg) const override
bool hasBasePointer(const MachineFunction &MF) const
std::underlying_type< E >::type Mask()
Get a bitmask with 1s in all places up to the high-order bit of E&#39;s largest value.
Definition: BitmaskEnum.h:81
IRTranslator LLVM IR MI
const TargetRegisterClass * getCrossCopyRegClass(const TargetRegisterClass *RC) const override
bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const override
needsFrameBaseReg - Returns true if the instruction&#39;s frame index reference would be better served by...
bool isAsmClobberable(const MachineFunction &MF, unsigned PhysReg) const override