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//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64REGISTERINFO_H
14#define LLVM_LIB_TARGET_AARCH64_AARCH64REGISTERINFO_H
15
16#define GET_REGINFO_HEADER
17#include "AArch64GenRegisterInfo.inc"
18
19namespace llvm {
20
21class MachineFunction;
22class RegScavenger;
23class TargetRegisterClass;
24class Triple;
25
26class AArch64RegisterInfo final : public AArch64GenRegisterInfo {
27 const Triple &TT;
28
29public:
30 AArch64RegisterInfo(const Triple &TT);
31
32 // FIXME: This should be tablegen'd like getDwarfRegNum is
33 int getSEHRegNum(unsigned i) const {
34 return getEncodingValue(i);
35 }
36
37 bool isReservedReg(const MachineFunction &MF, MCRegister Reg) const;
38 bool isStrictlyReservedReg(const MachineFunction &MF, MCRegister Reg) const;
39 bool isAnyArgRegReserved(const MachineFunction &MF) const;
40 void emitReservedArgRegCallError(const MachineFunction &MF) const;
41
42 void UpdateCustomCalleeSavedRegs(MachineFunction &MF) const;
43 void UpdateCustomCallPreservedMask(MachineFunction &MF,
44 const uint32_t **Mask) const;
45
46 /// Code Generation virtual methods...
47 const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
48 const MCPhysReg *getDarwinCalleeSavedRegs(const MachineFunction *MF) const;
49 const MCPhysReg *
50 getCalleeSavedRegsViaCopy(const MachineFunction *MF) const;
51 const uint32_t *getCallPreservedMask(const MachineFunction &MF,
52 CallingConv::ID) const override;
53 const uint32_t *getDarwinCallPreservedMask(const MachineFunction &MF,
54 CallingConv::ID) const;
55
56 unsigned getCSRFirstUseCost() const override {
57 // The cost will be compared against BlockFrequency where entry has the
58 // value of 1 << 14. A value of 5 will choose to spill or split really
59 // cold path instead of using a callee-saved register.
60 return 5;
61 }
62
63 const TargetRegisterClass *
64 getSubClassWithSubReg(const TargetRegisterClass *RC,
65 unsigned Idx) const override;
66
67 // Calls involved in thread-local variable lookup save more registers than
68 // normal calls, so they need a different mask to represent this.
69 const uint32_t *getTLSCallPreservedMask() const;
70
71 const uint32_t *getSMStartStopCallPreservedMask() const;
72 const uint32_t *SMEABISupportRoutinesCallPreservedMaskFromX0() const;
73
74 // Funclets on ARM64 Windows don't preserve any registers.
75 const uint32_t *getNoPreservedMask() const override;
76
77 // Unwinders may not preserve all Neon and SVE registers.
78 const uint32_t *
79 getCustomEHPadPreservedMask(const MachineFunction &MF) const override;
80
81 /// getThisReturnPreservedMask - Returns a call preserved mask specific to the
82 /// case that 'returned' is on an i64 first argument if the calling convention
83 /// is one that can (partially) model this attribute with a preserved mask
84 /// (i.e. it is a calling convention that uses the same register for the first
85 /// i64 argument and an i64 return value)
86 ///
87 /// Should return NULL in the case that the calling convention does not have
88 /// this property
89 const uint32_t *getThisReturnPreservedMask(const MachineFunction &MF,
90 CallingConv::ID) const;
91
92 /// Stack probing calls preserve different CSRs to the normal CC.
93 const uint32_t *getWindowsStackProbePreservedMask() const;
94
95 BitVector getStrictlyReservedRegs(const MachineFunction &MF) const;
96 BitVector getReservedRegs(const MachineFunction &MF) const override;
97 std::optional<std::string>
98 explainReservedReg(const MachineFunction &MF,
99 MCRegister PhysReg) const override;
100 bool isAsmClobberable(const MachineFunction &MF,
101 MCRegister PhysReg) const override;
102 const TargetRegisterClass *
103 getPointerRegClass(const MachineFunction &MF,
104 unsigned Kind = 0) const override;
105 const TargetRegisterClass *
106 getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
107
108 bool requiresRegisterScavenging(const MachineFunction &MF) const override;
109 bool useFPForScavengingIndex(const MachineFunction &MF) const override;
110 bool requiresFrameIndexScavenging(const MachineFunction &MF) const override;
111
112 bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const override;
113 bool isFrameOffsetLegal(const MachineInstr *MI, Register BaseReg,
114 int64_t Offset) const override;
115 Register materializeFrameBaseRegister(MachineBasicBlock *MBB, int FrameIdx,
116 int64_t Offset) const override;
117 void resolveFrameIndex(MachineInstr &MI, Register BaseReg,
118 int64_t Offset) const override;
119 bool eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
120 unsigned FIOperandNum,
121 RegScavenger *RS = nullptr) const override;
122 bool cannotEliminateFrame(const MachineFunction &MF) const;
123
124 bool requiresVirtualBaseRegisters(const MachineFunction &MF) const override;
125 bool hasBasePointer(const MachineFunction &MF) const;
126 unsigned getBaseRegister() const;
127
128 bool isArgumentRegister(const MachineFunction &MF,
129 MCRegister Reg) const override;
130
131 // Debug information queries.
132 Register getFrameRegister(const MachineFunction &MF) const override;
133
134 unsigned getRegPressureLimit(const TargetRegisterClass *RC,
135 MachineFunction &MF) const override;
136
137 unsigned getLocalAddressRegister(const MachineFunction &MF) const;
138 bool regNeedsCFI(unsigned Reg, unsigned &RegToUseForCFI) const;
139
140 /// SrcRC and DstRC will be morphed into NewRC if this returns true
141 bool shouldCoalesce(MachineInstr *MI, const TargetRegisterClass *SrcRC,
142 unsigned SubReg, const TargetRegisterClass *DstRC,
143 unsigned DstSubReg, const TargetRegisterClass *NewRC,
144 LiveIntervals &LIS) const override;
145
146 void getOffsetOpcodes(const StackOffset &Offset,
147 SmallVectorImpl<uint64_t> &Ops) const override;
148
149 bool shouldAnalyzePhysregInMachineLoopInfo(MCRegister R) const override;
150};
151
152} // end namespace llvm
153
154#endif
155

source code of llvm/lib/Target/AArch64/AArch64RegisterInfo.h