1 //===-- SIRegisterInfo.h - SI Register Info Interface ----------*- 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 //===----------------------------------------------------------------------===//
11 /// \brief Interface definition for SIRegisterInfo
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LIB_TARGET_AMDGPU_SIREGISTERINFO_H
16 #define LLVM_LIB_TARGET_AMDGPU_SIREGISTERINFO_H
18 #include "AMDGPURegisterInfo.h"
19 #include "SIDefines.h"
20 #include "MCTargetDesc/AMDGPUMCTargetDesc.h"
21 #include "llvm/CodeGen/MachineRegisterInfo.h"
25 class MachineRegisterInfo;
27 class SIMachineFunctionInfo;
29 class SIRegisterInfo final : public AMDGPURegisterInfo {
33 BitVector SGPRPressureSets;
34 BitVector VGPRPressureSets;
38 void reserveRegisterTuples(BitVector &, unsigned Reg) const;
39 void classifyPressureSet(unsigned PSetID, unsigned Reg,
40 BitVector &PressureSets) const;
42 SIRegisterInfo(const SISubtarget &ST);
44 bool spillSGPRToVGPR() const {
45 return SpillSGPRToVGPR;
48 bool spillSGPRToSMEM() const {
49 return SpillSGPRToSMEM;
52 /// Return the end register initially reserved for the scratch buffer in case
53 /// spilling is needed.
54 unsigned reservedPrivateSegmentBufferReg(const MachineFunction &MF) const;
56 /// Return the end register initially reserved for the scratch wave offset in
57 /// case spilling is needed.
58 unsigned reservedPrivateSegmentWaveByteOffsetReg(
59 const MachineFunction &MF) const;
61 unsigned reservedStackPtrOffsetReg(const MachineFunction &MF) const;
63 BitVector getReservedRegs(const MachineFunction &MF) const override;
65 const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
66 const uint32_t *getCallPreservedMask(const MachineFunction &MF,
67 CallingConv::ID) const override;
69 unsigned getFrameRegister(const MachineFunction &MF) const override;
71 bool requiresRegisterScavenging(const MachineFunction &Fn) const override;
73 bool requiresFrameIndexScavenging(const MachineFunction &MF) const override;
74 bool requiresFrameIndexReplacementScavenging(
75 const MachineFunction &MF) const override;
76 bool requiresVirtualBaseRegisters(const MachineFunction &Fn) const override;
77 bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override;
79 int64_t getMUBUFInstrOffset(const MachineInstr *MI) const;
81 int64_t getFrameIndexInstrOffset(const MachineInstr *MI,
82 int Idx) const override;
84 bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const override;
86 void materializeFrameBaseRegister(MachineBasicBlock *MBB,
87 unsigned BaseReg, int FrameIdx,
88 int64_t Offset) const override;
90 void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
91 int64_t Offset) const override;
93 bool isFrameOffsetLegal(const MachineInstr *MI, unsigned BaseReg,
94 int64_t Offset) const override;
96 const TargetRegisterClass *getPointerRegClass(
97 const MachineFunction &MF, unsigned Kind = 0) const override;
99 /// If \p OnlyToVGPR is true, this will only succeed if this
100 bool spillSGPR(MachineBasicBlock::iterator MI,
101 int FI, RegScavenger *RS,
102 bool OnlyToVGPR = false) const;
104 bool restoreSGPR(MachineBasicBlock::iterator MI,
105 int FI, RegScavenger *RS,
106 bool OnlyToVGPR = false) const;
108 void eliminateFrameIndex(MachineBasicBlock::iterator MI, int SPAdj,
109 unsigned FIOperandNum,
110 RegScavenger *RS) const override;
112 bool eliminateSGPRToVGPRSpillFrameIndex(MachineBasicBlock::iterator MI,
113 int FI, RegScavenger *RS) const;
115 unsigned getHWRegIndex(unsigned Reg) const {
116 return getEncodingValue(Reg) & 0xff;
119 /// \brief Return the 'base' register class for this register.
120 /// e.g. SGPR0 => SReg_32, VGPR => VGPR_32 SGPR0_SGPR1 -> SReg_32, etc.
121 const TargetRegisterClass *getPhysRegClass(unsigned Reg) const;
123 /// \returns true if this class contains only SGPR registers
124 bool isSGPRClass(const TargetRegisterClass *RC) const {
125 return !hasVGPRs(RC);
128 /// \returns true if this class ID contains only SGPR registers
129 bool isSGPRClassID(unsigned RCID) const {
130 return isSGPRClass(getRegClass(RCID));
133 bool isSGPRReg(const MachineRegisterInfo &MRI, unsigned Reg) const {
134 const TargetRegisterClass *RC;
135 if (TargetRegisterInfo::isVirtualRegister(Reg))
136 RC = MRI.getRegClass(Reg);
138 RC = getPhysRegClass(Reg);
139 return isSGPRClass(RC);
142 /// \returns true if this class contains VGPR registers.
143 bool hasVGPRs(const TargetRegisterClass *RC) const;
145 /// \returns A VGPR reg class with the same width as \p SRC
146 const TargetRegisterClass *getEquivalentVGPRClass(
147 const TargetRegisterClass *SRC) const;
149 /// \returns A SGPR reg class with the same width as \p SRC
150 const TargetRegisterClass *getEquivalentSGPRClass(
151 const TargetRegisterClass *VRC) const;
153 /// \returns The register class that is used for a sub-register of \p RC for
154 /// the given \p SubIdx. If \p SubIdx equals NoSubRegister, \p RC will
156 const TargetRegisterClass *getSubRegClass(const TargetRegisterClass *RC,
157 unsigned SubIdx) const;
159 bool shouldRewriteCopySrc(const TargetRegisterClass *DefRC,
161 const TargetRegisterClass *SrcRC,
162 unsigned SrcSubReg) const override;
164 /// \returns True if operands defined with this operand type can accept
165 /// a literal constant (i.e. any 32-bit immediate).
166 bool opCanUseLiteralConstant(unsigned OpType) const {
167 // TODO: 64-bit operands have extending behavior from 32-bit literal.
168 return OpType >= AMDGPU::OPERAND_REG_IMM_FIRST &&
169 OpType <= AMDGPU::OPERAND_REG_IMM_LAST;
172 /// \returns True if operands defined with this operand type can accept
173 /// an inline constant. i.e. An integer value in the range (-16, 64) or
174 /// -4.0f, -2.0f, -1.0f, -0.5f, 0.0f, 0.5f, 1.0f, 2.0f, 4.0f.
175 bool opCanUseInlineConstant(unsigned OpType) const {
176 return OpType >= AMDGPU::OPERAND_SRC_FIRST &&
177 OpType <= AMDGPU::OPERAND_SRC_LAST;
180 enum PreloadedValue {
182 PRIVATE_SEGMENT_BUFFER = 0,
185 KERNARG_SEGMENT_PTR = 3,
187 FLAT_SCRATCH_INIT = 5,
191 PRIVATE_SEGMENT_WAVE_BYTE_OFFSET = 14,
194 FIRST_VGPR_VALUE = 15,
195 WORKITEM_ID_X = FIRST_VGPR_VALUE,
200 /// \brief Returns the physical register that \p Value is stored in.
201 unsigned getPreloadedValue(const MachineFunction &MF,
202 enum PreloadedValue Value) const;
204 unsigned findUnusedRegister(const MachineRegisterInfo &MRI,
205 const TargetRegisterClass *RC,
206 const MachineFunction &MF) const;
208 unsigned getSGPRPressureSet() const { return SGPRSetID; };
209 unsigned getVGPRPressureSet() const { return VGPRSetID; };
211 const TargetRegisterClass *getRegClassForReg(const MachineRegisterInfo &MRI,
213 bool isVGPR(const MachineRegisterInfo &MRI, unsigned Reg) const;
215 bool isSGPRPressureSet(unsigned SetID) const {
216 return SGPRPressureSets.test(SetID) && !VGPRPressureSets.test(SetID);
218 bool isVGPRPressureSet(unsigned SetID) const {
219 return VGPRPressureSets.test(SetID) && !SGPRPressureSets.test(SetID);
222 ArrayRef<int16_t> getRegSplitParts(const TargetRegisterClass *RC,
223 unsigned EltSize) const;
225 bool shouldCoalesce(MachineInstr *MI,
226 const TargetRegisterClass *SrcRC,
228 const TargetRegisterClass *DstRC,
230 const TargetRegisterClass *NewRC) const override;
232 unsigned getRegPressureLimit(const TargetRegisterClass *RC,
233 MachineFunction &MF) const override;
235 unsigned getRegPressureSetLimit(const MachineFunction &MF,
236 unsigned Idx) const override;
238 const int *getRegUnitPressureSets(unsigned RegUnit) const override;
240 unsigned getReturnAddressReg(const MachineFunction &MF) const {
241 // Not a callee saved register.
242 return AMDGPU::SGPR30_SGPR31;
246 void buildSpillLoadStore(MachineBasicBlock::iterator MI,
247 unsigned LoadStoreOp,
251 unsigned ScratchRsrcReg,
252 unsigned ScratchOffsetReg,
254 MachineMemOperand *MMO,
255 RegScavenger *RS) const;
258 } // End namespace llvm