LLVM  10.0.0svn
Go to the documentation of this file.
1 //==- AArch64RegisterInfo.h - AArch64 Register Information Impl --*- C++ -*-==//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains the AArch64 implementation of the MRegisterInfo class.
10 //
11 //===----------------------------------------------------------------------===//
17 #include "AArch64GenRegisterInfo.inc"
19 namespace llvm {
21 class MachineFunction;
22 class RegScavenger;
23 class TargetRegisterClass;
24 class Triple;
27  const Triple &TT;
29 public:
30  AArch64RegisterInfo(const Triple &TT);
32  // FIXME: This should be tablegen'd like getDwarfRegNum is
33  int getSEHRegNum(unsigned i) const {
34  return getEncodingValue(i);
35  }
37  bool isReservedReg(const MachineFunction &MF, unsigned Reg) const;
38  bool isAnyArgRegReserved(const MachineFunction &MF) const;
39  void emitReservedArgRegCallError(const MachineFunction &MF) const;
43  const uint32_t **Mask) const;
45  /// Code Generation virtual methods...
46  const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
47  const MCPhysReg *
50  CallingConv::ID) const override;
52  unsigned getCSRFirstUseCost() const override {
53  // The cost will be compared against BlockFrequency where entry has the
54  // value of 1 << 14. A value of 5 will choose to spill or split really
55  // cold path instead of using a callee-saved register.
56  return 5;
57  }
59  const TargetRegisterClass *
61  unsigned Idx) const override;
63  // Calls involved in thread-local variable lookup save more registers than
64  // normal calls, so they need a different mask to represent this.
65  const uint32_t *getTLSCallPreservedMask() const;
67  // Funclets on ARM64 Windows don't preserve any registers.
68  const uint32_t *getNoPreservedMask() const override;
70  /// getThisReturnPreservedMask - Returns a call preserved mask specific to the
71  /// case that 'returned' is on an i64 first argument if the calling convention
72  /// is one that can (partially) model this attribute with a preserved mask
73  /// (i.e. it is a calling convention that uses the same register for the first
74  /// i64 argument and an i64 return value)
75  ///
76  /// Should return NULL in the case that the calling convention does not have
77  /// this property
79  CallingConv::ID) const;
81  /// Stack probing calls preserve different CSRs to the normal CC.
84  BitVector getReservedRegs(const MachineFunction &MF) const override;
85  bool isAsmClobberable(const MachineFunction &MF,
86  unsigned PhysReg) const override;
87  bool isConstantPhysReg(unsigned PhysReg) const override;
88  const TargetRegisterClass *
90  unsigned Kind = 0) const override;
91  const TargetRegisterClass *
92  getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
94  bool requiresRegisterScavenging(const MachineFunction &MF) const override;
95  bool useFPForScavengingIndex(const MachineFunction &MF) const override;
96  bool requiresFrameIndexScavenging(const MachineFunction &MF) const override;
98  bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const override;
99  bool isFrameOffsetLegal(const MachineInstr *MI, unsigned BaseReg,
100  int64_t Offset) const override;
101  void materializeFrameBaseRegister(MachineBasicBlock *MBB, unsigned BaseReg,
102  int FrameIdx,
103  int64_t Offset) const override;
104  void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
105  int64_t Offset) const override;
107  unsigned FIOperandNum,
108  RegScavenger *RS = nullptr) const override;
109  bool cannotEliminateFrame(const MachineFunction &MF) const;
111  bool requiresVirtualBaseRegisters(const MachineFunction &MF) const override;
112  bool hasBasePointer(const MachineFunction &MF) const;
113  unsigned getBaseRegister() const;
115  // Debug information queries.
116  Register getFrameRegister(const MachineFunction &MF) const override;
118  unsigned getRegPressureLimit(const TargetRegisterClass *RC,
119  MachineFunction &MF) const override;
121  bool trackLivenessAfterRegAlloc(const MachineFunction&) const override {
122  return true;
123  }
125  unsigned getLocalAddressRegister(const MachineFunction &MF) const;
126 };
128 } // end namespace llvm
130 #endif
This class represents lattice values for constants.
Definition: AllocatorList.h:23
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
bool requiresFrameIndexScavenging(const MachineFunction &MF) const override
const uint32_t * getNoPreservedMask() 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...
Definition: MCRegister.h:19
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...
Register getFrameRegister(const MachineFunction &MF) const override
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:43
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:63
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
int getSEHRegNum(unsigned i) const
unsigned getLocalAddressRegister(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
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:80
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
Wrapper class representing virtual and physical registers.
Definition: Register.h:19