1 //===-- MipsSubtarget.h - Define Subtarget for the Mips ---------*- 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 declares the Mips specific subclass of TargetSubtargetInfo. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_MIPS_MIPSSUBTARGET_H 14 #define LLVM_LIB_TARGET_MIPS_MIPSSUBTARGET_H 15 16 #include "MCTargetDesc/MipsABIInfo.h" 17 #include "MipsFrameLowering.h" 18 #include "MipsISelLowering.h" 19 #include "MipsInstrInfo.h" 20 #include "llvm/CodeGen/SelectionDAGTargetInfo.h" 21 #include "llvm/CodeGen/TargetSubtargetInfo.h" 22 #include "llvm/CodeGen/GlobalISel/CallLowering.h" 23 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h" 24 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h" 25 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h" 26 #include "llvm/IR/DataLayout.h" 27 #include "llvm/MC/MCInstrItineraries.h" 28 #include "llvm/Support/ErrorHandling.h" 29 #include <string> 30 31 #define GET_SUBTARGETINFO_HEADER 32 #include "MipsGenSubtargetInfo.inc" 33 34 namespace llvm { 35 class StringRef; 36 37 class MipsTargetMachine; 38 39 class MipsSubtarget : public MipsGenSubtargetInfo { 40 virtual void anchor(); 41 42 enum MipsArchEnum { 43 MipsDefault, 44 Mips1, Mips2, Mips32, Mips32r2, Mips32r3, Mips32r5, Mips32r6, Mips32Max, 45 Mips3, Mips4, Mips5, Mips64, Mips64r2, Mips64r3, Mips64r5, Mips64r6 46 }; 47 48 enum class CPU { P5600 }; 49 50 // Used to avoid printing dsp warnings multiple times. 51 static bool DspWarningPrinted; 52 53 // Used to avoid printing msa warnings multiple times. 54 static bool MSAWarningPrinted; 55 56 // Used to avoid printing crc warnings multiple times. 57 static bool CRCWarningPrinted; 58 59 // Used to avoid printing ginv warnings multiple times. 60 static bool GINVWarningPrinted; 61 62 // Used to avoid printing virt warnings multiple times. 63 static bool VirtWarningPrinted; 64 65 // Mips architecture version 66 MipsArchEnum MipsArchVersion; 67 68 // Processor implementation (unused but required to exist by 69 // tablegen-erated code). 70 CPU ProcImpl; 71 72 // IsLittle - The target is Little Endian 73 bool IsLittle; 74 75 // IsSoftFloat - The target does not support any floating point instructions. 76 bool IsSoftFloat; 77 78 // IsSingleFloat - The target only supports single precision float 79 // point operations. This enable the target to use all 32 32-bit 80 // floating point registers instead of only using even ones. 81 bool IsSingleFloat; 82 83 // IsFPXX - MIPS O32 modeless ABI. 84 bool IsFPXX; 85 86 // NoABICalls - Disable SVR4-style position-independent code. 87 bool NoABICalls; 88 89 // Abs2008 - Use IEEE 754-2008 abs.fmt instruction. 90 bool Abs2008; 91 92 // IsFP64bit - The target processor has 64-bit floating point registers. 93 bool IsFP64bit; 94 95 /// Are odd single-precision registers permitted? 96 /// This corresponds to -modd-spreg and -mno-odd-spreg 97 bool UseOddSPReg; 98 99 // IsNan2008 - IEEE 754-2008 NaN encoding. 100 bool IsNaN2008bit; 101 102 // IsGP64bit - General-purpose registers are 64 bits wide 103 bool IsGP64bit; 104 105 // IsPTR64bit - Pointers are 64 bit wide 106 bool IsPTR64bit; 107 108 // HasVFPU - Processor has a vector floating point unit. 109 bool HasVFPU; 110 111 // CPU supports cnMIPS (Cavium Networks Octeon CPU). 112 bool HasCnMips; 113 114 // isLinux - Target system is Linux. Is false we consider ELFOS for now. 115 bool IsLinux; 116 117 // UseSmallSection - Small section is used. 118 bool UseSmallSection; 119 120 /// Features related to the presence of specific instructions. 121 122 // HasMips3_32 - The subset of MIPS-III instructions added to MIPS32 123 bool HasMips3_32; 124 125 // HasMips3_32r2 - The subset of MIPS-III instructions added to MIPS32r2 126 bool HasMips3_32r2; 127 128 // HasMips4_32 - Has the subset of MIPS-IV present in MIPS32 129 bool HasMips4_32; 130 131 // HasMips4_32r2 - Has the subset of MIPS-IV present in MIPS32r2 132 bool HasMips4_32r2; 133 134 // HasMips5_32r2 - Has the subset of MIPS-V present in MIPS32r2 135 bool HasMips5_32r2; 136 137 // InMips16 -- can process Mips16 instructions 138 bool InMips16Mode; 139 140 // Mips16 hard float 141 bool InMips16HardFloat; 142 143 // InMicroMips -- can process MicroMips instructions 144 bool InMicroMipsMode; 145 146 // HasDSP, HasDSPR2, HasDSPR3 -- supports DSP ASE. 147 bool HasDSP, HasDSPR2, HasDSPR3; 148 149 // Allow mixed Mips16 and Mips32 in one source file 150 bool AllowMixed16_32; 151 152 // Optimize for space by compiling all functions as Mips 16 unless 153 // it needs floating point. Functions needing floating point are 154 // compiled as Mips32 155 bool Os16; 156 157 // HasMSA -- supports MSA ASE. 158 bool HasMSA; 159 160 // UseTCCInDIV -- Enables the use of trapping in the assembler. 161 bool UseTCCInDIV; 162 163 // Sym32 -- On Mips64 symbols are 32 bits. 164 bool HasSym32; 165 166 // HasEVA -- supports EVA ASE. 167 bool HasEVA; 168 169 // nomadd4 - disables generation of 4-operand madd.s, madd.d and 170 // related instructions. 171 bool DisableMadd4; 172 173 // HasMT -- support MT ASE. 174 bool HasMT; 175 176 // HasCRC -- supports R6 CRC ASE 177 bool HasCRC; 178 179 // HasVirt -- supports Virtualization ASE 180 bool HasVirt; 181 182 // HasGINV -- supports R6 Global INValidate ASE 183 bool HasGINV; 184 185 // Use hazard variants of the jump register instructions for indirect 186 // function calls and jump tables. 187 bool UseIndirectJumpsHazard; 188 189 // Disable use of the `jal` instruction. 190 bool UseLongCalls = false; 191 192 // Assume 32-bit GOT. 193 bool UseXGOT = false; 194 195 /// The minimum alignment known to hold of the stack frame on 196 /// entry to the function and which must be maintained by every function. 197 Align stackAlignment; 198 199 /// The overridden stack alignment. 200 MaybeAlign StackAlignOverride; 201 202 InstrItineraryData InstrItins; 203 204 // We can override the determination of whether we are in mips16 mode 205 // as from the command line 206 enum {NoOverride, Mips16Override, NoMips16Override} OverrideMode; 207 208 const MipsTargetMachine &TM; 209 210 Triple TargetTriple; 211 212 const SelectionDAGTargetInfo TSInfo; 213 std::unique_ptr<const MipsInstrInfo> InstrInfo; 214 std::unique_ptr<const MipsFrameLowering> FrameLowering; 215 std::unique_ptr<const MipsTargetLowering> TLInfo; 216 217 public: 218 bool isPositionIndependent() const; 219 /// This overrides the PostRAScheduler bit in the SchedModel for each CPU. 220 bool enablePostRAScheduler() const override; 221 void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override; 222 CodeGenOpt::Level getOptLevelToEnablePostRAScheduler() const override; 223 224 bool isABI_N64() const; 225 bool isABI_N32() const; 226 bool isABI_O32() const; 227 const MipsABIInfo &getABI() const; 228 bool isABI_FPXX() const { return isABI_O32() && IsFPXX; } 229 230 /// This constructor initializes the data members to match that 231 /// of the specified triple. 232 MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS, bool little, 233 const MipsTargetMachine &TM, MaybeAlign StackAlignOverride); 234 235 /// ParseSubtargetFeatures - Parses features string setting specified 236 /// subtarget options. Definition of function is auto generated by tblgen. 237 void ParseSubtargetFeatures(StringRef CPU, StringRef FS); 238 239 bool hasMips1() const { return MipsArchVersion >= Mips1; } 240 bool hasMips2() const { return MipsArchVersion >= Mips2; } 241 bool hasMips3() const { return MipsArchVersion >= Mips3; } 242 bool hasMips4() const { return MipsArchVersion >= Mips4; } 243 bool hasMips5() const { return MipsArchVersion >= Mips5; } 244 bool hasMips4_32() const { return HasMips4_32; } 245 bool hasMips4_32r2() const { return HasMips4_32r2; } 246 bool hasMips32() const { 247 return (MipsArchVersion >= Mips32 && MipsArchVersion < Mips32Max) || 248 hasMips64(); 249 } 250 bool hasMips32r2() const { 251 return (MipsArchVersion >= Mips32r2 && MipsArchVersion < Mips32Max) || 252 hasMips64r2(); 253 } 254 bool hasMips32r3() const { 255 return (MipsArchVersion >= Mips32r3 && MipsArchVersion < Mips32Max) || 256 hasMips64r2(); 257 } 258 bool hasMips32r5() const { 259 return (MipsArchVersion >= Mips32r5 && MipsArchVersion < Mips32Max) || 260 hasMips64r5(); 261 } 262 bool hasMips32r6() const { 263 return (MipsArchVersion >= Mips32r6 && MipsArchVersion < Mips32Max) || 264 hasMips64r6(); 265 } 266 bool hasMips64() const { return MipsArchVersion >= Mips64; } 267 bool hasMips64r2() const { return MipsArchVersion >= Mips64r2; } 268 bool hasMips64r3() const { return MipsArchVersion >= Mips64r3; } 269 bool hasMips64r5() const { return MipsArchVersion >= Mips64r5; } 270 bool hasMips64r6() const { return MipsArchVersion >= Mips64r6; } 271 272 bool hasCnMips() const { return HasCnMips; } 273 274 bool isLittle() const { return IsLittle; } 275 bool isABICalls() const { return !NoABICalls; } 276 bool isFPXX() const { return IsFPXX; } 277 bool isFP64bit() const { return IsFP64bit; } 278 bool useOddSPReg() const { return UseOddSPReg; } 279 bool noOddSPReg() const { return !UseOddSPReg; } 280 bool isNaN2008() const { return IsNaN2008bit; } 281 bool inAbs2008Mode() const { return Abs2008; } 282 bool isGP64bit() const { return IsGP64bit; } 283 bool isGP32bit() const { return !IsGP64bit; } 284 unsigned getGPRSizeInBytes() const { return isGP64bit() ? 8 : 4; } 285 bool isPTR64bit() const { return IsPTR64bit; } 286 bool isPTR32bit() const { return !IsPTR64bit; } 287 bool hasSym32() const { 288 return (HasSym32 && isABI_N64()) || isABI_N32() || isABI_O32(); 289 } 290 bool isSingleFloat() const { return IsSingleFloat; } 291 bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); } 292 bool hasVFPU() const { return HasVFPU; } 293 bool inMips16Mode() const { return InMips16Mode; } 294 bool inMips16ModeDefault() const { 295 return InMips16Mode; 296 } 297 // Hard float for mips16 means essentially to compile as soft float 298 // but to use a runtime library for soft float that is written with 299 // native mips32 floating point instructions (those runtime routines 300 // run in mips32 hard float mode). 301 bool inMips16HardFloat() const { 302 return inMips16Mode() && InMips16HardFloat; 303 } 304 bool inMicroMipsMode() const { return InMicroMipsMode && !InMips16Mode; } 305 bool inMicroMips32r6Mode() const { 306 return inMicroMipsMode() && hasMips32r6(); 307 } 308 bool hasDSP() const { return HasDSP; } 309 bool hasDSPR2() const { return HasDSPR2; } 310 bool hasDSPR3() const { return HasDSPR3; } 311 bool hasMSA() const { return HasMSA; } 312 bool disableMadd4() const { return DisableMadd4; } 313 bool hasEVA() const { return HasEVA; } 314 bool hasMT() const { return HasMT; } 315 bool hasCRC() const { return HasCRC; } 316 bool hasVirt() const { return HasVirt; } 317 bool hasGINV() const { return HasGINV; } 318 bool useIndirectJumpsHazard() const { 319 return UseIndirectJumpsHazard && hasMips32r2(); 320 } 321 bool useSmallSection() const { return UseSmallSection; } 322 323 bool hasStandardEncoding() const { return !InMips16Mode && !InMicroMipsMode; } 324 325 bool useSoftFloat() const { return IsSoftFloat; } 326 327 bool useLongCalls() const { return UseLongCalls; } 328 329 bool useXGOT() const { return UseXGOT; } 330 331 bool enableLongBranchPass() const { 332 return hasStandardEncoding() || inMicroMipsMode() || allowMixed16_32(); 333 } 334 335 /// Features related to the presence of specific instructions. 336 bool hasExtractInsert() const { return !inMips16Mode() && hasMips32r2(); } 337 bool hasMTHC1() const { return hasMips32r2(); } 338 339 bool allowMixed16_32() const { return inMips16ModeDefault() | 340 AllowMixed16_32; } 341 342 bool os16() const { return Os16; } 343 344 bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); } 345 346 bool isXRaySupported() const override { return true; } 347 348 // for now constant islands are on for the whole compilation unit but we only 349 // really use them if in addition we are in mips16 mode 350 static bool useConstantIslands(); 351 352 Align getStackAlignment() const { return stackAlignment; } 353 354 // Grab relocation model 355 Reloc::Model getRelocationModel() const; 356 357 MipsSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS, 358 const TargetMachine &TM); 359 360 /// Does the system support unaligned memory access. 361 /// 362 /// MIPS32r6/MIPS64r6 require full unaligned access support but does not 363 /// specify which component of the system provides it. Hardware, software, and 364 /// hybrid implementations are all valid. 365 bool systemSupportsUnalignedAccess() const { return hasMips32r6(); } 366 367 // Set helper classes 368 void setHelperClassesMips16(); 369 void setHelperClassesMipsSE(); 370 371 const SelectionDAGTargetInfo *getSelectionDAGInfo() const override { 372 return &TSInfo; 373 } 374 const MipsInstrInfo *getInstrInfo() const override { return InstrInfo.get(); } 375 const TargetFrameLowering *getFrameLowering() const override { 376 return FrameLowering.get(); 377 } 378 const MipsRegisterInfo *getRegisterInfo() const override { 379 return &InstrInfo->getRegisterInfo(); 380 } 381 const MipsTargetLowering *getTargetLowering() const override { 382 return TLInfo.get(); 383 } 384 const InstrItineraryData *getInstrItineraryData() const override { 385 return &InstrItins; 386 } 387 388 protected: 389 // GlobalISel related APIs. 390 std::unique_ptr<CallLowering> CallLoweringInfo; 391 std::unique_ptr<LegalizerInfo> Legalizer; 392 std::unique_ptr<RegisterBankInfo> RegBankInfo; 393 std::unique_ptr<InstructionSelector> InstSelector; 394 395 public: 396 const CallLowering *getCallLowering() const override; 397 const LegalizerInfo *getLegalizerInfo() const override; 398 const RegisterBankInfo *getRegBankInfo() const override; 399 InstructionSelector *getInstructionSelector() const override; 400 }; 401 } // End llvm namespace 402 403 #endif 404