1 //===- AMDGPUInstructionSelector --------------------------------*- 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 /// \file
9 /// This file declares the targeting of the InstructionSelector class for
10 /// AMDGPU.
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUINSTRUCTIONSELECTOR_H
14 #define LLVM_LIB_TARGET_AMDGPU_AMDGPUINSTRUCTIONSELECTOR_H
15 
16 #include "AMDGPU.h"
17 #include "AMDGPUArgumentUsageInfo.h"
18 #include "llvm/ADT/ArrayRef.h"
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/CodeGen/Register.h"
21 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
22 #include "llvm/IR/InstrTypes.h"
23 
24 namespace {
25 #define GET_GLOBALISEL_PREDICATE_BITSET
26 #define AMDGPUSubtarget GCNSubtarget
27 #include "AMDGPUGenGlobalISel.inc"
28 #undef GET_GLOBALISEL_PREDICATE_BITSET
29 #undef AMDGPUSubtarget
30 }
31 
32 namespace llvm {
33 
34 namespace AMDGPU {
35 struct ImageDimIntrinsicInfo;
36 }
37 
38 class AMDGPUInstrInfo;
39 class AMDGPURegisterBankInfo;
40 class GCNSubtarget;
41 class MachineInstr;
42 class MachineIRBuilder;
43 class MachineOperand;
44 class MachineRegisterInfo;
45 class RegisterBank;
46 class SIInstrInfo;
47 class SIMachineFunctionInfo;
48 class SIRegisterInfo;
49 
50 class AMDGPUInstructionSelector final : public InstructionSelector {
51 private:
52   MachineRegisterInfo *MRI;
53 
54 public:
55   AMDGPUInstructionSelector(const GCNSubtarget &STI,
56                             const AMDGPURegisterBankInfo &RBI,
57                             const AMDGPUTargetMachine &TM);
58 
59   bool select(MachineInstr &I) override;
60   static const char *getName();
61 
62   void setupMF(MachineFunction &MF, GISelKnownBits &KB,
63                CodeGenCoverage &CoverageInfo) override;
64 
65 private:
66   struct GEPInfo {
67     const MachineInstr &GEP;
68     SmallVector<unsigned, 2> SgprParts;
69     SmallVector<unsigned, 2> VgprParts;
70     int64_t Imm;
71     GEPInfo(const MachineInstr &GEP) : GEP(GEP), Imm(0) { }
72   };
73 
74   bool isInstrUniform(const MachineInstr &MI) const;
75   bool isVCC(Register Reg, const MachineRegisterInfo &MRI) const;
76 
77   const RegisterBank *getArtifactRegBank(
78     Register Reg, const MachineRegisterInfo &MRI,
79     const TargetRegisterInfo &TRI) const;
80 
81   /// tblgen-erated 'select' implementation.
82   bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const;
83 
84   MachineOperand getSubOperand64(MachineOperand &MO,
85                                  const TargetRegisterClass &SubRC,
86                                  unsigned SubIdx) const;
87 
88   bool constrainCopyLikeIntrin(MachineInstr &MI, unsigned NewOpc) const;
89   bool selectCOPY(MachineInstr &I) const;
90   bool selectPHI(MachineInstr &I) const;
91   bool selectG_TRUNC(MachineInstr &I) const;
92   bool selectG_SZA_EXT(MachineInstr &I) const;
93   bool selectG_CONSTANT(MachineInstr &I) const;
94   bool selectG_FNEG(MachineInstr &I) const;
95   bool selectG_FABS(MachineInstr &I) const;
96   bool selectG_AND_OR_XOR(MachineInstr &I) const;
97   bool selectG_ADD_SUB(MachineInstr &I) const;
98   bool selectG_UADDO_USUBO_UADDE_USUBE(MachineInstr &I) const;
99   bool selectG_EXTRACT(MachineInstr &I) const;
100   bool selectG_MERGE_VALUES(MachineInstr &I) const;
101   bool selectG_UNMERGE_VALUES(MachineInstr &I) const;
102   bool selectG_BUILD_VECTOR_TRUNC(MachineInstr &I) const;
103   bool selectG_PTR_ADD(MachineInstr &I) const;
104   bool selectG_IMPLICIT_DEF(MachineInstr &I) const;
105   bool selectG_INSERT(MachineInstr &I) const;
106 
107   bool selectInterpP1F16(MachineInstr &MI) const;
108   bool selectWritelane(MachineInstr &MI) const;
109   bool selectDivScale(MachineInstr &MI) const;
110   bool selectIntrinsicIcmp(MachineInstr &MI) const;
111   bool selectBallot(MachineInstr &I) const;
112   bool selectRelocConstant(MachineInstr &I) const;
113   bool selectGroupStaticSize(MachineInstr &I) const;
114   bool selectReturnAddress(MachineInstr &I) const;
115   bool selectG_INTRINSIC(MachineInstr &I) const;
116 
117   bool selectEndCfIntrinsic(MachineInstr &MI) const;
118   bool selectDSOrderedIntrinsic(MachineInstr &MI, Intrinsic::ID IID) const;
119   bool selectDSGWSIntrinsic(MachineInstr &MI, Intrinsic::ID IID) const;
120   bool selectDSAppendConsume(MachineInstr &MI, bool IsAppend) const;
121   bool selectSBarrier(MachineInstr &MI) const;
122 
123   bool selectImageIntrinsic(MachineInstr &MI,
124                             const AMDGPU::ImageDimIntrinsicInfo *Intr) const;
125   bool selectG_INTRINSIC_W_SIDE_EFFECTS(MachineInstr &I) const;
126   int getS_CMPOpcode(CmpInst::Predicate P, unsigned Size) const;
127   bool selectG_ICMP(MachineInstr &I) const;
128   bool hasVgprParts(ArrayRef<GEPInfo> AddrInfo) const;
129   void getAddrModeInfo(const MachineInstr &Load, const MachineRegisterInfo &MRI,
130                        SmallVectorImpl<GEPInfo> &AddrInfo) const;
131   bool selectSMRD(MachineInstr &I, ArrayRef<GEPInfo> AddrInfo) const;
132 
133   void initM0(MachineInstr &I) const;
134   bool selectG_LOAD_STORE_ATOMICRMW(MachineInstr &I) const;
135   bool selectG_AMDGPU_ATOMIC_CMPXCHG(MachineInstr &I) const;
136   bool selectG_SELECT(MachineInstr &I) const;
137   bool selectG_BRCOND(MachineInstr &I) const;
138   bool selectG_GLOBAL_VALUE(MachineInstr &I) const;
139   bool selectG_PTRMASK(MachineInstr &I) const;
140   bool selectG_EXTRACT_VECTOR_ELT(MachineInstr &I) const;
141   bool selectG_INSERT_VECTOR_ELT(MachineInstr &I) const;
142   bool selectG_SHUFFLE_VECTOR(MachineInstr &I) const;
143 
144   std::pair<Register, unsigned>
145   selectVOP3ModsImpl(MachineOperand &Root) const;
146 
147   InstructionSelector::ComplexRendererFns
148   selectVCSRC(MachineOperand &Root) const;
149 
150   InstructionSelector::ComplexRendererFns
151   selectVSRC0(MachineOperand &Root) const;
152 
153   InstructionSelector::ComplexRendererFns
154   selectVOP3Mods0(MachineOperand &Root) const;
155   InstructionSelector::ComplexRendererFns
156   selectVOP3OMods(MachineOperand &Root) const;
157   InstructionSelector::ComplexRendererFns
158   selectVOP3Mods(MachineOperand &Root) const;
159 
160   ComplexRendererFns selectVOP3NoMods(MachineOperand &Root) const;
161 
162   InstructionSelector::ComplexRendererFns
163   selectVOP3Mods_nnan(MachineOperand &Root) const;
164 
165   std::pair<Register, unsigned>
166   selectVOP3PModsImpl(Register Src, const MachineRegisterInfo &MRI) const;
167 
168   InstructionSelector::ComplexRendererFns
169   selectVOP3PMods(MachineOperand &Root) const;
170 
171   InstructionSelector::ComplexRendererFns
172   selectVOP3OpSelMods(MachineOperand &Root) const;
173 
174   InstructionSelector::ComplexRendererFns
175   selectSmrdImm(MachineOperand &Root) const;
176   InstructionSelector::ComplexRendererFns
177   selectSmrdImm32(MachineOperand &Root) const;
178   InstructionSelector::ComplexRendererFns
179   selectSmrdSgpr(MachineOperand &Root) const;
180 
181   template <bool Signed>
182   InstructionSelector::ComplexRendererFns
183   selectFlatOffsetImpl(MachineOperand &Root) const;
184   InstructionSelector::ComplexRendererFns
185   selectFlatOffset(MachineOperand &Root) const;
186 
187   InstructionSelector::ComplexRendererFns
188   selectFlatOffsetSigned(MachineOperand &Root) const;
189 
190   InstructionSelector::ComplexRendererFns
191   selectGlobalSAddr(MachineOperand &Root) const;
192 
193   InstructionSelector::ComplexRendererFns
194   selectMUBUFScratchOffen(MachineOperand &Root) const;
195   InstructionSelector::ComplexRendererFns
196   selectMUBUFScratchOffset(MachineOperand &Root) const;
197 
198   bool isDSOffsetLegal(Register Base, int64_t Offset,
199                        unsigned OffsetBits) const;
200 
201   std::pair<Register, unsigned>
202   selectDS1Addr1OffsetImpl(MachineOperand &Root) const;
203   InstructionSelector::ComplexRendererFns
204   selectDS1Addr1Offset(MachineOperand &Root) const;
205 
206   InstructionSelector::ComplexRendererFns
207   selectDS64Bit4ByteAligned(MachineOperand &Root) const;
208 
209   InstructionSelector::ComplexRendererFns
210   selectDS128Bit8ByteAligned(MachineOperand &Root) const;
211 
212   std::pair<Register, unsigned>
213   selectDSReadWrite2Impl(MachineOperand &Root, bool IsDS128) const;
214   InstructionSelector::ComplexRendererFns
215   selectDSReadWrite2(MachineOperand &Root, bool IsDS128) const;
216 
217   std::pair<Register, int64_t>
218   getPtrBaseWithConstantOffset(Register Root,
219                                const MachineRegisterInfo &MRI) const;
220 
221   // Parse out a chain of up to two g_ptr_add instructions.
222   // g_ptr_add (n0, _)
223   // g_ptr_add (n0, (n1 = g_ptr_add n2, n3))
224   struct MUBUFAddressData {
225     Register N0, N2, N3;
226     int64_t Offset = 0;
227   };
228 
229   bool shouldUseAddr64(MUBUFAddressData AddrData) const;
230 
231   void splitIllegalMUBUFOffset(MachineIRBuilder &B,
232                                Register &SOffset, int64_t &ImmOffset) const;
233 
234   MUBUFAddressData parseMUBUFAddress(Register Src) const;
235 
236   bool selectMUBUFAddr64Impl(MachineOperand &Root, Register &VAddr,
237                              Register &RSrcReg, Register &SOffset,
238                              int64_t &Offset) const;
239 
240   bool selectMUBUFOffsetImpl(MachineOperand &Root, Register &RSrcReg,
241                              Register &SOffset, int64_t &Offset) const;
242 
243   InstructionSelector::ComplexRendererFns
244   selectMUBUFAddr64(MachineOperand &Root) const;
245 
246   InstructionSelector::ComplexRendererFns
247   selectMUBUFOffset(MachineOperand &Root) const;
248 
249   InstructionSelector::ComplexRendererFns
250   selectMUBUFOffsetAtomic(MachineOperand &Root) const;
251 
252   InstructionSelector::ComplexRendererFns
253   selectMUBUFAddr64Atomic(MachineOperand &Root) const;
254 
255   ComplexRendererFns selectSMRDBufferImm(MachineOperand &Root) const;
256   ComplexRendererFns selectSMRDBufferImm32(MachineOperand &Root) const;
257 
258   void renderTruncImm32(MachineInstrBuilder &MIB, const MachineInstr &MI,
259                         int OpIdx = -1) const;
260 
261   void renderTruncTImm(MachineInstrBuilder &MIB, const MachineInstr &MI,
262                        int OpIdx) const;
263 
264   void renderTruncTImm1(MachineInstrBuilder &MIB, const MachineInstr &MI,
265                         int OpIdx) const {
266     renderTruncTImm(MIB, MI, OpIdx);
267   }
268 
269   void renderTruncTImm8(MachineInstrBuilder &MIB, const MachineInstr &MI,
270                         int OpIdx) const {
271     renderTruncTImm(MIB, MI, OpIdx);
272   }
273 
274   void renderTruncTImm16(MachineInstrBuilder &MIB, const MachineInstr &MI,
275                         int OpIdx) const {
276     renderTruncTImm(MIB, MI, OpIdx);
277   }
278 
279   void renderTruncTImm32(MachineInstrBuilder &MIB, const MachineInstr &MI,
280                         int OpIdx) const {
281     renderTruncTImm(MIB, MI, OpIdx);
282   }
283 
284   void renderNegateImm(MachineInstrBuilder &MIB, const MachineInstr &MI,
285                        int OpIdx) const;
286 
287   void renderBitcastImm(MachineInstrBuilder &MIB, const MachineInstr &MI,
288                         int OpIdx) const;
289 
290   void renderPopcntImm(MachineInstrBuilder &MIB, const MachineInstr &MI,
291                        int OpIdx) const;
292   void renderExtractGLC(MachineInstrBuilder &MIB, const MachineInstr &MI,
293                         int OpIdx) const;
294   void renderExtractSLC(MachineInstrBuilder &MIB, const MachineInstr &MI,
295                         int OpIdx) const;
296   void renderExtractDLC(MachineInstrBuilder &MIB, const MachineInstr &MI,
297                         int OpIdx) const;
298   void renderExtractSWZ(MachineInstrBuilder &MIB, const MachineInstr &MI,
299                         int OpIdx) const;
300   void renderFrameIndex(MachineInstrBuilder &MIB, const MachineInstr &MI,
301                         int OpIdx) const;
302 
303   bool isInlineImmediate16(int64_t Imm) const;
304   bool isInlineImmediate32(int64_t Imm) const;
305   bool isInlineImmediate64(int64_t Imm) const;
306   bool isInlineImmediate(const APFloat &Imm) const;
307 
308   const SIInstrInfo &TII;
309   const SIRegisterInfo &TRI;
310   const AMDGPURegisterBankInfo &RBI;
311   const AMDGPUTargetMachine &TM;
312   const GCNSubtarget &STI;
313   bool EnableLateStructurizeCFG;
314 #define GET_GLOBALISEL_PREDICATES_DECL
315 #define AMDGPUSubtarget GCNSubtarget
316 #include "AMDGPUGenGlobalISel.inc"
317 #undef GET_GLOBALISEL_PREDICATES_DECL
318 #undef AMDGPUSubtarget
319 
320 #define GET_GLOBALISEL_TEMPORARIES_DECL
321 #include "AMDGPUGenGlobalISel.inc"
322 #undef GET_GLOBALISEL_TEMPORARIES_DECL
323 };
324 
325 } // End llvm namespace.
326 #endif
327