lib/Target/AArch64/AArch64Subtarget.h

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//===--- AArch64Subtarget.h - Define Subtarget for the AArch64 -*- C++ -*--===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares the AArch64 specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64SUBTARGET_H
#define LLVM_LIB_TARGET_AARCH64_AARCH64SUBTARGET_H

#include "AArch64FrameLowering.h"
#include "AArch64ISelLowering.h"
#include "AArch64InstrInfo.h"
#include "AArch64RegisterInfo.h"
#include "AArch64SelectionDAGInfo.h"
#include "llvm/CodeGen/GlobalISel/CallLowering.h"
#include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
#include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DataLayout.h"
#include <string>

#define GET_SUBTARGETINFO_HEADER
#include "AArch64GenSubtargetInfo.inc"

namespace llvm {
class GlobalValue;
class StringRef;
class Triple;

class AArch64Subtarget final : public AArch64GenSubtargetInfo {
public:
  enum ARMProcFamilyEnum : uint8_t {
    Others,
    CortexA35,
    CortexA53,
    CortexA55,
    CortexA57,
    CortexA65,
    CortexA72,
    CortexA73,
    CortexA75,
    CortexA76,
    Cyclone,
    ExynosM1,
    ExynosM3,
    Falkor,
    Kryo,
    NeoverseE1,
    NeoverseN1,
    Saphira,
    ThunderX2T99,
    ThunderX,
    ThunderXT81,
    ThunderXT83,
    ThunderXT88,
    TSV110
  };

protected:
  /// ARMProcFamily - ARM processor family: Cortex-A53, Cortex-A57, and others.
  ARMProcFamilyEnum ARMProcFamily = Others;

  bool HasV8_1aOps = false;
  bool HasV8_2aOps = false;
  bool HasV8_3aOps = false;
  bool HasV8_4aOps = false;
  bool HasV8_5aOps = false;

  bool HasFPARMv8 = false;
  bool HasNEON = false;
  bool HasCrypto = false;
  bool HasDotProd = false;
  bool HasCRC = false;
  bool HasLSE = false;
  bool HasRAS = false;
  bool HasRDM = false;
  bool HasPerfMon = false;
  bool HasFullFP16 = false;
  bool HasFP16FML = false;
  bool HasSPE = false;

  // ARMv8.1 extensions
  bool HasVH = false;
  bool HasPAN = false;
  bool HasLOR = false;

  // ARMv8.2 extensions
  bool HasPsUAO = false;
  bool HasPAN_RWV = false;
  bool HasCCPP = false;

  // Armv8.2 Crypto extensions
  bool HasSM4 = false;
  bool HasSHA3 = false;
  bool HasSHA2 = false;
  bool HasAES = false;

  // ARMv8.3 extensions
  bool HasPA = false;
  bool HasJS = false;
  bool HasCCIDX = false;
  bool HasComplxNum = false;

  // ARMv8.4 extensions
  bool HasNV = false;
  bool HasRASv8_4 = false;
  bool HasMPAM = false;
  bool HasDIT = false;
  bool HasTRACEV8_4 = false;
  bool HasAM = false;
  bool HasSEL2 = false;
  bool HasPMU = false;
  bool HasTLB_RMI = false;
  bool HasFMI = false;
  bool HasRCPC_IMMO = false;

  bool HasLSLFast = false;
  bool HasSVE = false;
  bool HasSVE2 = false;
  bool HasRCPC = false;
  bool HasAggressiveFMA = false;

  // Armv8.5-A Extensions
  bool HasAlternativeNZCV = false;
  bool HasFRInt3264 = false;
  bool HasSpecRestrict = false;
  bool HasSSBS = false;
  bool HasSB = false;
  bool HasPredRes = false;
  bool HasCCDP = false;
  bool HasBTI = false;
  bool HasRandGen = false;
  bool HasMTE = false;
  bool HasTME = false;

  // Arm SVE2 extensions
  bool HasSVE2AES = false;
  bool HasSVE2SM4 = false;
  bool HasSVE2SHA3 = false;
  bool HasSVE2BitPerm = false;

  // Future architecture extensions.
  bool HasETE = false;
  bool HasTRBE = false;

  // HasZeroCycleRegMove - Has zero-cycle register mov instructions.
  bool HasZeroCycleRegMove = false;

  // HasZeroCycleZeroing - Has zero-cycle zeroing instructions.
  bool HasZeroCycleZeroing = false;
  bool HasZeroCycleZeroingGP = false;
  bool HasZeroCycleZeroingFP = false;
  bool HasZeroCycleZeroingFPWorkaround = false;

  // StrictAlign - Disallow unaligned memory accesses.
  bool StrictAlign = false;

  // NegativeImmediates - transform instructions with negative immediates
  bool NegativeImmediates = true;

  // Enable 64-bit vectorization in SLP.
  unsigned MinVectorRegisterBitWidth = 64;

  bool UseAA = false;
  bool PredictableSelectIsExpensive = false;
  bool BalanceFPOps = false;
  bool CustomAsCheapAsMove = false;
  bool ExynosAsCheapAsMove = false;
  bool UsePostRAScheduler = false;
  bool Misaligned128StoreIsSlow = false;
  bool Paired128IsSlow = false;
  bool STRQroIsSlow = false;
  bool UseAlternateSExtLoadCVTF32Pattern = false;
  bool HasArithmeticBccFusion = false;
  bool HasArithmeticCbzFusion = false;
  bool HasFuseAddress = false;
  bool HasFuseAES = false;
  bool HasFuseArithmeticLogic = false;
  bool HasFuseCCSelect = false;
  bool HasFuseCryptoEOR = false;
  bool HasFuseLiterals = false;
  bool DisableLatencySchedHeuristic = false;
  bool UseRSqrt = false;
  bool Force32BitJumpTables = false;
  bool UseEL1ForTP = false;
  bool UseEL2ForTP = false;
  bool UseEL3ForTP = false;
  bool AllowTaggedGlobals = false;
  uint8_t MaxInterleaveFactor = 2;
  uint8_t VectorInsertExtractBaseCost = 3;
  uint16_t CacheLineSize = 0;
  uint16_t PrefetchDistance = 0;
  uint16_t MinPrefetchStride = 1;
  unsigned MaxPrefetchIterationsAhead = UINT_MAX;
  unsigned PrefFunctionLogAlignment = 0;
  unsigned PrefLoopLogAlignment = 0;
  unsigned MaxJumpTableSize = 0;
  unsigned WideningBaseCost = 0;

  // ReserveXRegister[i] - X#i is not available as a general purpose register.
  BitVector ReserveXRegister;

  // CustomCallUsedXRegister[i] - X#i call saved.
  BitVector CustomCallSavedXRegs;

  bool IsLittle;

  /// TargetTriple - What processor and OS we're targeting.
  Triple TargetTriple;

  AArch64FrameLowering FrameLowering;
  AArch64InstrInfo InstrInfo;
  AArch64SelectionDAGInfo TSInfo;
  AArch64TargetLowering TLInfo;

  /// GlobalISel related APIs.
  std::unique_ptr<CallLowering> CallLoweringInfo;
  std::unique_ptr<InstructionSelector> InstSelector;
  std::unique_ptr<LegalizerInfo> Legalizer;
  std::unique_ptr<RegisterBankInfo> RegBankInfo;

private:
  /// initializeSubtargetDependencies - Initializes using CPUString and the
  /// passed in feature string so that we can use initializer lists for
  /// subtarget initialization.
  AArch64Subtarget &initializeSubtargetDependencies(StringRef FS,
                                                    StringRef CPUString);

  /// Initialize properties based on the selected processor family.
  void initializeProperties();

public:
  /// This constructor initializes the data members to match that
  /// of the specified triple.
  AArch64Subtarget(const Triple &TT, const std::string &CPU,
                   const std::string &FS, const TargetMachine &TM,
                   bool LittleEndian);

  const AArch64SelectionDAGInfo *getSelectionDAGInfo() const override {
    return &TSInfo;
  }
  const AArch64FrameLowering *getFrameLowering() const override {
    return &FrameLowering;
  }
  const AArch64TargetLowering *getTargetLowering() const override {
    return &TLInfo;
  }
  const AArch64InstrInfo *getInstrInfo() const override { return &InstrInfo; }
  const AArch64RegisterInfo *getRegisterInfo() const override {
    return &getInstrInfo()->getRegisterInfo();
  }
  const CallLowering *getCallLowering() const override;
  InstructionSelector *getInstructionSelector() const override;
  const LegalizerInfo *getLegalizerInfo() const override;
  const RegisterBankInfo *getRegBankInfo() const override;
  const Triple &getTargetTriple() const { return TargetTriple; }
  bool enableMachineScheduler() const override { return true; }
  bool enablePostRAScheduler() const override {
    return UsePostRAScheduler;
  }

  /// Returns ARM processor family.
  /// Avoid this function! CPU specifics should be kept local to this class
  /// and preferably modeled with SubtargetFeatures or properties in
  /// initializeProperties().
  ARMProcFamilyEnum getProcFamily() const {
    return ARMProcFamily;
  }

  bool hasV8_1aOps() const { return HasV8_1aOps; }
  bool hasV8_2aOps() const { return HasV8_2aOps; }
  bool hasV8_3aOps() const { return HasV8_3aOps; }
  bool hasV8_4aOps() const { return HasV8_4aOps; }
  bool hasV8_5aOps() const { return HasV8_5aOps; }

  bool hasZeroCycleRegMove() const { return HasZeroCycleRegMove; }

  bool hasZeroCycleZeroingGP() const { return HasZeroCycleZeroingGP; }

  bool hasZeroCycleZeroingFP() const { return HasZeroCycleZeroingFP; }

  bool hasZeroCycleZeroingFPWorkaround() const {
    return HasZeroCycleZeroingFPWorkaround;
  }

  bool requiresStrictAlign() const { return StrictAlign; }

  bool isXRaySupported() const override { return true; }

  unsigned getMinVectorRegisterBitWidth() const {
    return MinVectorRegisterBitWidth;
  }

  bool isXRegisterReserved(size_t i) const { return ReserveXRegister[i]; }
  unsigned getNumXRegisterReserved() const { return ReserveXRegister.count(); }
  bool isXRegCustomCalleeSaved(size_t i) const {
    return CustomCallSavedXRegs[i];
  }
  bool hasCustomCallingConv() const { return CustomCallSavedXRegs.any(); }
  bool hasFPARMv8() const { return HasFPARMv8; }
  bool hasNEON() const { return HasNEON; }
  bool hasCrypto() const { return HasCrypto; }
  bool hasDotProd() const { return HasDotProd; }
  bool hasCRC() const { return HasCRC; }
  bool hasLSE() const { return HasLSE; }
  bool hasRAS() const { return HasRAS; }
  bool hasRDM() const { return HasRDM; }
  bool hasSM4() const { return HasSM4; }
  bool hasSHA3() const { return HasSHA3; }
  bool hasSHA2() const { return HasSHA2; }
  bool hasAES() const { return HasAES; }
  bool balanceFPOps() const { return BalanceFPOps; }
  bool predictableSelectIsExpensive() const {
    return PredictableSelectIsExpensive;
  }
  bool hasCustomCheapAsMoveHandling() const { return CustomAsCheapAsMove; }
  bool hasExynosCheapAsMoveHandling() const { return ExynosAsCheapAsMove; }
  bool isMisaligned128StoreSlow() const { return Misaligned128StoreIsSlow; }
  bool isPaired128Slow() const { return Paired128IsSlow; }
  bool isSTRQroSlow() const { return STRQroIsSlow; }
  bool useAlternateSExtLoadCVTF32Pattern() const {
    return UseAlternateSExtLoadCVTF32Pattern;
  }
  bool hasArithmeticBccFusion() const { return HasArithmeticBccFusion; }
  bool hasArithmeticCbzFusion() const { return HasArithmeticCbzFusion; }
  bool hasFuseAddress() const { return HasFuseAddress; }
  bool hasFuseAES() const { return HasFuseAES; }
  bool hasFuseArithmeticLogic() const { return HasFuseArithmeticLogic; }
  bool hasFuseCCSelect() const { return HasFuseCCSelect; }
  bool hasFuseCryptoEOR() const { return HasFuseCryptoEOR; }
  bool hasFuseLiterals() const { return HasFuseLiterals; }

  /// Return true if the CPU supports any kind of instruction fusion.
  bool hasFusion() const {
    return hasArithmeticBccFusion() || hasArithmeticCbzFusion() ||
           hasFuseAES() || hasFuseArithmeticLogic() ||
           hasFuseCCSelect() || hasFuseLiterals();
  }

  bool useEL1ForTP() const { return UseEL1ForTP; }
  bool useEL2ForTP() const { return UseEL2ForTP; }
  bool useEL3ForTP() const { return UseEL3ForTP; }

  bool useRSqrt() const { return UseRSqrt; }
  bool force32BitJumpTables() const { return Force32BitJumpTables; }
  unsigned getMaxInterleaveFactor() const { return MaxInterleaveFactor; }
  unsigned getVectorInsertExtractBaseCost() const {
    return VectorInsertExtractBaseCost;
  }
  unsigned getCacheLineSize() const override { return CacheLineSize; }
  unsigned getPrefetchDistance() const override { return PrefetchDistance; }
  unsigned getMinPrefetchStride() const override { return MinPrefetchStride; }
  unsigned getMaxPrefetchIterationsAhead() const override {
    return MaxPrefetchIterationsAhead;
  }
  unsigned getPrefFunctionLogAlignment() const {
    return PrefFunctionLogAlignment;
  }
  unsigned getPrefLoopLogAlignment() const { return PrefLoopLogAlignment; }

  unsigned getMaximumJumpTableSize() const { return MaxJumpTableSize; }

  unsigned getWideningBaseCost() const { return WideningBaseCost; }

  /// CPU has TBI (top byte of addresses is ignored during HW address
  /// translation) and OS enables it.
  bool supportsAddressTopByteIgnored() const;

  bool hasPerfMon() const { return HasPerfMon; }
  bool hasFullFP16() const { return HasFullFP16; }
  bool hasFP16FML() const { return HasFP16FML; }
  bool hasSPE() const { return HasSPE; }
  bool hasLSLFast() const { return HasLSLFast; }
  bool hasSVE() const { return HasSVE; }
  bool hasSVE2() const { return HasSVE2; }
  bool hasRCPC() const { return HasRCPC; }
  bool hasAggressiveFMA() const { return HasAggressiveFMA; }
  bool hasAlternativeNZCV() const { return HasAlternativeNZCV; }
  bool hasFRInt3264() const { return HasFRInt3264; }
  bool hasSpecRestrict() const { return HasSpecRestrict; }
  bool hasSSBS() const { return HasSSBS; }
  bool hasSB() const { return HasSB; }
  bool hasPredRes() const { return HasPredRes; }
  bool hasCCDP() const { return HasCCDP; }
  bool hasBTI() const { return HasBTI; }
  bool hasRandGen() const { return HasRandGen; }
  bool hasMTE() const { return HasMTE; }
  bool hasTME() const { return HasTME; }
  // Arm SVE2 extensions
  bool hasSVE2AES() const { return HasSVE2AES; }
  bool hasSVE2SM4() const { return HasSVE2SM4; }
  bool hasSVE2SHA3() const { return HasSVE2SHA3; }
  bool hasSVE2BitPerm() const { return HasSVE2BitPerm; }

  bool isLittleEndian() const { return IsLittle; }

  bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
  bool isTargetIOS() const { return TargetTriple.isiOS(); }
  bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
  bool isTargetWindows() const { return TargetTriple.isOSWindows(); }
  bool isTargetAndroid() const { return TargetTriple.isAndroid(); }
  bool isTargetFuchsia() const { return TargetTriple.isOSFuchsia(); }

  bool isTargetCOFF() const { return TargetTriple.isOSBinFormatCOFF(); }
  bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
  bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }

  bool isTargetILP32() const { return TargetTriple.isArch32Bit(); }

  bool useAA() const override { return UseAA; }

  bool hasVH() const { return HasVH; }
  bool hasPAN() const { return HasPAN; }
  bool hasLOR() const { return HasLOR; }

  bool hasPsUAO() const { return HasPsUAO; }
  bool hasPAN_RWV() const { return HasPAN_RWV; }
  bool hasCCPP() const { return HasCCPP; }

  bool hasPA() const { return HasPA; }
  bool hasJS() const { return HasJS; }
  bool hasCCIDX() const { return HasCCIDX; }
  bool hasComplxNum() const { return HasComplxNum; }

  bool hasNV() const { return HasNV; }
  bool hasRASv8_4() const { return HasRASv8_4; }
  bool hasMPAM() const { return HasMPAM; }
  bool hasDIT() const { return HasDIT; }
  bool hasTRACEV8_4() const { return HasTRACEV8_4; }
  bool hasAM() const { return HasAM; }
  bool hasSEL2() const { return HasSEL2; }
  bool hasPMU() const { return HasPMU; }
  bool hasTLB_RMI() const { return HasTLB_RMI; }
  bool hasFMI() const { return HasFMI; }
  bool hasRCPC_IMMO() const { return HasRCPC_IMMO; }

  bool addrSinkUsingGEPs() const override {
    // Keeping GEPs inbounds is important for exploiting AArch64
    // addressing-modes in ILP32 mode.
    return useAA() || isTargetILP32();
  }

  bool useSmallAddressing() const {
    switch (TLInfo.getTargetMachine().getCodeModel()) {
      case CodeModel::Kernel:
        // Kernel is currently allowed only for Fuchsia targets,
        // where it is the same as Small for almost all purposes.
      case CodeModel::Small:
        return true;
      default:
        return false;
    }
  }

  /// ParseSubtargetFeatures - Parses features string setting specified
  /// subtarget options.  Definition of function is auto generated by tblgen.
  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);

  /// ClassifyGlobalReference - Find the target operand flags that describe
  /// how a global value should be referenced for the current subtarget.
  unsigned ClassifyGlobalReference(const GlobalValue *GV,
                                   const TargetMachine &TM) const;

  unsigned classifyGlobalFunctionReference(const GlobalValue *GV,
                                           const TargetMachine &TM) const;

  void overrideSchedPolicy(MachineSchedPolicy &Policy,
                           unsigned NumRegionInstrs) const override;

  bool enableEarlyIfConversion() const override;

  std::unique_ptr<PBQPRAConstraint> getCustomPBQPConstraints() const override;

  bool isCallingConvWin64(CallingConv::ID CC) const {
    switch (CC) {
    case CallingConv::C:
    case CallingConv::Fast:
    case CallingConv::Swift:
      return isTargetWindows();
    case CallingConv::Win64:
      return true;
    default:
      return false;
    }
  }

  void mirFileLoaded(MachineFunction &MF) const override;
};
} // End llvm namespace

#endif