1 //===--- AArch64Subtarget.h - Define Subtarget for the AArch64 -*- 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 //===----------------------------------------------------------------------===//
10 // This file declares the AArch64 specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64SUBTARGET_H
15 #define LLVM_LIB_TARGET_AARCH64_AARCH64SUBTARGET_H
17 #include "AArch64FrameLowering.h"
18 #include "AArch64ISelLowering.h"
19 #include "AArch64InstrInfo.h"
20 #include "AArch64RegisterInfo.h"
21 #include "AArch64SelectionDAGInfo.h"
22 #include "llvm/CodeGen/GlobalISel/GISelAccessor.h"
23 #include "llvm/IR/DataLayout.h"
24 #include "llvm/Target/TargetSubtargetInfo.h"
27 #define GET_SUBTARGETINFO_HEADER
28 #include "AArch64GenSubtargetInfo.inc"
35 class AArch64Subtarget final : public AArch64GenSubtargetInfo {
37 enum ARMProcFamilyEnum : uint8_t {
56 /// ARMProcFamily - ARM processor family: Cortex-A53, Cortex-A57, and others.
57 ARMProcFamilyEnum ARMProcFamily = Others;
59 bool HasV8_1aOps = false;
60 bool HasV8_2aOps = false;
62 bool HasFPARMv8 = false;
64 bool HasCrypto = false;
69 bool HasPerfMon = false;
70 bool HasFullFP16 = false;
72 bool HasLSLFast = false;
74 // HasZeroCycleRegMove - Has zero-cycle register mov instructions.
75 bool HasZeroCycleRegMove = false;
77 // HasZeroCycleZeroing - Has zero-cycle zeroing instructions.
78 bool HasZeroCycleZeroing = false;
80 // StrictAlign - Disallow unaligned memory accesses.
81 bool StrictAlign = false;
83 // NegativeImmediates - transform instructions with negative immediates
84 bool NegativeImmediates = true;
87 bool PredictableSelectIsExpensive = false;
88 bool BalanceFPOps = false;
89 bool CustomAsCheapAsMove = false;
90 bool UsePostRAScheduler = false;
91 bool Misaligned128StoreIsSlow = false;
92 bool Paired128IsSlow = false;
93 bool UseAlternateSExtLoadCVTF32Pattern = false;
94 bool HasArithmeticBccFusion = false;
95 bool HasArithmeticCbzFusion = false;
96 bool HasFuseAES = false;
97 bool HasFuseLiterals = false;
98 bool DisableLatencySchedHeuristic = false;
99 bool UseRSqrt = false;
100 uint8_t MaxInterleaveFactor = 2;
101 uint8_t VectorInsertExtractBaseCost = 3;
102 uint16_t CacheLineSize = 0;
103 uint16_t PrefetchDistance = 0;
104 uint16_t MinPrefetchStride = 1;
105 unsigned MaxPrefetchIterationsAhead = UINT_MAX;
106 unsigned PrefFunctionAlignment = 0;
107 unsigned PrefLoopAlignment = 0;
108 unsigned MaxJumpTableSize = 0;
110 // ReserveX18 - X18 is not available as a general purpose register.
115 /// TargetTriple - What processor and OS we're targeting.
118 AArch64FrameLowering FrameLowering;
119 AArch64InstrInfo InstrInfo;
120 AArch64SelectionDAGInfo TSInfo;
121 AArch64TargetLowering TLInfo;
122 /// Gather the accessor points to GlobalISel-related APIs.
123 /// This is used to avoid ifndefs spreading around while GISel is
124 /// an optional library.
125 std::unique_ptr<GISelAccessor> GISel;
130 /// initializeSubtargetDependencies - Initializes using CPUString and the
131 /// passed in feature string so that we can use initializer lists for
132 /// subtarget initialization.
133 AArch64Subtarget &initializeSubtargetDependencies(StringRef FS,
134 StringRef CPUString);
136 /// Initialize properties based on the selected processor family.
137 void initializeProperties();
140 /// This constructor initializes the data members to match that
141 /// of the specified triple.
142 AArch64Subtarget(const Triple &TT, const std::string &CPU,
143 const std::string &FS, const TargetMachine &TM,
144 bool LittleEndian, bool ForCodeSize);
146 /// This object will take onwership of \p GISelAccessor.
147 void setGISelAccessor(GISelAccessor &GISel) {
148 this->GISel.reset(&GISel);
151 const AArch64SelectionDAGInfo *getSelectionDAGInfo() const override {
154 const AArch64FrameLowering *getFrameLowering() const override {
155 return &FrameLowering;
157 const AArch64TargetLowering *getTargetLowering() const override {
160 const AArch64InstrInfo *getInstrInfo() const override { return &InstrInfo; }
161 const AArch64RegisterInfo *getRegisterInfo() const override {
162 return &getInstrInfo()->getRegisterInfo();
164 const CallLowering *getCallLowering() const override;
165 const InstructionSelector *getInstructionSelector() const override;
166 const LegalizerInfo *getLegalizerInfo() const override;
167 const RegisterBankInfo *getRegBankInfo() const override;
168 const Triple &getTargetTriple() const { return TargetTriple; }
169 bool enableMachineScheduler() const override { return true; }
170 bool enablePostRAScheduler() const override {
171 return UsePostRAScheduler;
174 /// Returns ARM processor family.
175 /// Avoid this function! CPU specifics should be kept local to this class
176 /// and preferably modeled with SubtargetFeatures or properties in
177 /// initializeProperties().
178 ARMProcFamilyEnum getProcFamily() const {
179 return ARMProcFamily;
182 bool hasV8_1aOps() const { return HasV8_1aOps; }
183 bool hasV8_2aOps() const { return HasV8_2aOps; }
185 bool hasZeroCycleRegMove() const { return HasZeroCycleRegMove; }
187 bool hasZeroCycleZeroing() const { return HasZeroCycleZeroing; }
189 bool requiresStrictAlign() const { return StrictAlign; }
191 bool isXRaySupported() const override { return true; }
193 bool isX18Reserved() const { return ReserveX18; }
194 bool hasFPARMv8() const { return HasFPARMv8; }
195 bool hasNEON() const { return HasNEON; }
196 bool hasCrypto() const { return HasCrypto; }
197 bool hasCRC() const { return HasCRC; }
198 bool hasLSE() const { return HasLSE; }
199 bool hasRAS() const { return HasRAS; }
200 bool hasRDM() const { return HasRDM; }
201 bool balanceFPOps() const { return BalanceFPOps; }
202 bool predictableSelectIsExpensive() const {
203 return PredictableSelectIsExpensive;
205 bool hasCustomCheapAsMoveHandling() const { return CustomAsCheapAsMove; }
206 bool isMisaligned128StoreSlow() const { return Misaligned128StoreIsSlow; }
207 bool isPaired128Slow() const { return Paired128IsSlow; }
208 bool useAlternateSExtLoadCVTF32Pattern() const {
209 return UseAlternateSExtLoadCVTF32Pattern;
211 bool hasArithmeticBccFusion() const { return HasArithmeticBccFusion; }
212 bool hasArithmeticCbzFusion() const { return HasArithmeticCbzFusion; }
213 bool hasFuseAES() const { return HasFuseAES; }
214 bool hasFuseLiterals() const { return HasFuseLiterals; }
215 bool useRSqrt() const { return UseRSqrt; }
216 unsigned getMaxInterleaveFactor() const { return MaxInterleaveFactor; }
217 unsigned getVectorInsertExtractBaseCost() const {
218 return VectorInsertExtractBaseCost;
220 unsigned getCacheLineSize() const { return CacheLineSize; }
221 unsigned getPrefetchDistance() const { return PrefetchDistance; }
222 unsigned getMinPrefetchStride() const { return MinPrefetchStride; }
223 unsigned getMaxPrefetchIterationsAhead() const {
224 return MaxPrefetchIterationsAhead;
226 unsigned getPrefFunctionAlignment() const { return PrefFunctionAlignment; }
227 unsigned getPrefLoopAlignment() const { return PrefLoopAlignment; }
229 unsigned getMaximumJumpTableSize() const { return MaxJumpTableSize; }
231 /// CPU has TBI (top byte of addresses is ignored during HW address
232 /// translation) and OS enables it.
233 bool supportsAddressTopByteIgnored() const;
235 bool hasPerfMon() const { return HasPerfMon; }
236 bool hasFullFP16() const { return HasFullFP16; }
237 bool hasSPE() const { return HasSPE; }
238 bool hasLSLFast() const { return HasLSLFast; }
240 bool isLittleEndian() const { return IsLittle; }
242 bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
243 bool isTargetIOS() const { return TargetTriple.isiOS(); }
244 bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
245 bool isTargetWindows() const { return TargetTriple.isOSWindows(); }
246 bool isTargetAndroid() const { return TargetTriple.isAndroid(); }
247 bool isTargetFuchsia() const { return TargetTriple.isOSFuchsia(); }
249 bool isTargetCOFF() const { return TargetTriple.isOSBinFormatCOFF(); }
250 bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
251 bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
253 bool useAA() const override { return UseAA; }
255 bool useSmallAddressing() const {
256 switch (TLInfo.getTargetMachine().getCodeModel()) {
257 case CodeModel::Kernel:
258 // Kernel is currently allowed only for Fuchsia targets,
259 // where it is the same as Small for almost all purposes.
260 case CodeModel::Small:
267 bool getForCodeSize() const { return ForCodeSize; }
269 /// ParseSubtargetFeatures - Parses features string setting specified
270 /// subtarget options. Definition of function is auto generated by tblgen.
271 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
273 /// ClassifyGlobalReference - Find the target operand flags that describe
274 /// how a global value should be referenced for the current subtarget.
275 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
276 const TargetMachine &TM) const;
278 unsigned char classifyGlobalFunctionReference(const GlobalValue *GV,
279 const TargetMachine &TM) const;
281 /// This function returns the name of a function which has an interface
282 /// like the non-standard bzero function, if such a function exists on
283 /// the current subtarget and it is considered prefereable over
284 /// memset with zero passed as the second argument. Otherwise it
286 const char *getBZeroEntry() const;
288 void overrideSchedPolicy(MachineSchedPolicy &Policy,
289 unsigned NumRegionInstrs) const override;
291 bool enableEarlyIfConversion() const override;
293 std::unique_ptr<PBQPRAConstraint> getCustomPBQPConstraints() const override;
295 } // End llvm namespace