AArch64RegisterInfo.h revision 4c5e43da7792f75567b693105cc53e3f1992ad98 
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//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64REGISTERINFO_H
15#define LLVM_LIB_TARGET_AARCH64_AARCH64REGISTERINFO_H
16
17#define GET_REGINFO_HEADER
18#include "AArch64GenRegisterInfo.inc"
19
20namespace llvm {
21
22class MachineFunction;
23class RegScavenger;
24class TargetRegisterClass;
25class Triple;
26
27struct AArch64RegisterInfo : public AArch64GenRegisterInfo {
28private:
29  const Triple &TT;
30
31public:
32  AArch64RegisterInfo(const Triple &TT);
33
34  bool isReservedReg(const MachineFunction &MF, unsigned Reg) const;
35
36  /// Code Generation virtual methods...
37  const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
38  const uint32_t *getCallPreservedMask(const MachineFunction &MF,
39                                       CallingConv::ID) const override;
40
41  unsigned getCSRFirstUseCost() const override {
42    // The cost will be compared against BlockFrequency where entry has the
43    // value of 1 << 14. A value of 5 will choose to spill or split really
44    // cold path instead of using a callee-saved register.
45    return 5;
46  }
47
48  // Calls involved in thread-local variable lookup save more registers than
49  // normal calls, so they need a different mask to represent this.
50  const uint32_t *getTLSCallPreservedMask() const;
51
52  /// getThisReturnPreservedMask - Returns a call preserved mask specific to the
53  /// case that 'returned' is on an i64 first argument if the calling convention
54  /// is one that can (partially) model this attribute with a preserved mask
55  /// (i.e. it is a calling convention that uses the same register for the first
56  /// i64 argument and an i64 return value)
57  ///
58  /// Should return NULL in the case that the calling convention does not have
59  /// this property
60  const uint32_t *getThisReturnPreservedMask(const MachineFunction &MF,
61                                             CallingConv::ID) const;
62
63  BitVector getReservedRegs(const MachineFunction &MF) const override;
64  const TargetRegisterClass *
65  getPointerRegClass(const MachineFunction &MF,
66                     unsigned Kind = 0) const override;
67  const TargetRegisterClass *
68  getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
69
70  bool requiresRegisterScavenging(const MachineFunction &MF) const override;
71  bool useFPForScavengingIndex(const MachineFunction &MF) const override;
72  bool requiresFrameIndexScavenging(const MachineFunction &MF) const override;
73
74  bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const override;
75  bool isFrameOffsetLegal(const MachineInstr *MI, unsigned BaseReg,
76                          int64_t Offset) const override;
77  void materializeFrameBaseRegister(MachineBasicBlock *MBB, unsigned BaseReg,
78                                    int FrameIdx,
79                                    int64_t Offset) const override;
80  void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
81                         int64_t Offset) const override;
82  void eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
83                           unsigned FIOperandNum,
84                           RegScavenger *RS = nullptr) const override;
85  bool cannotEliminateFrame(const MachineFunction &MF) const;
86
87  bool requiresVirtualBaseRegisters(const MachineFunction &MF) const override;
88  bool hasBasePointer(const MachineFunction &MF) const;
89  unsigned getBaseRegister() const;
90
91  // Debug information queries.
92  unsigned getFrameRegister(const MachineFunction &MF) const override;
93
94  unsigned getRegPressureLimit(const TargetRegisterClass *RC,
95                               MachineFunction &MF) const override;
96};
97
98} // end namespace llvm
99
100#endif
101