GCNSubtarget.h

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//=====-- GCNSubtarget.h - Define GCN Subtarget for AMDGPU ------*- 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
//
//==-----------------------------------------------------------------------===//
//
/// \file
/// AMD GCN specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_AMDGPU_GCNSUBTARGET_H
#define LLVM_LIB_TARGET_AMDGPU_GCNSUBTARGET_H
 
#include "AMDGPUCallLowering.h"
#include "AMDGPUSubtarget.h"
#include "SIFrameLowering.h"
#include "SIISelLowering.h"
#include "SIInstrInfo.h"
#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
 
namespace llvm {
 
class MCInst;
class MCInstrInfo;
 
} // namespace llvm
 
#define GET_SUBTARGETINFO_HEADER
#include "AMDGPUGenSubtargetInfo.inc"
 
namespace llvm {
 
class GCNTargetMachine;
 
class GCNSubtarget final : public AMDGPUGenSubtargetInfo,
                           public AMDGPUSubtarget {
 
  using AMDGPUSubtarget::getMaxWavesPerEU;
 
public:
  // Following 2 enums are documented at:
  //   - https://llvm.org/docs/AMDGPUUsage.html#trap-handler-abi
  enum class TrapHandlerAbi {
    NONE   = 0x00,
    AMDHSA = 0x01,
  };
 
  enum class TrapID {
    LLVMAMDHSATrap      = 0x02,
    LLVMAMDHSADebugTrap = 0x03,
  };
 
private:
  /// GlobalISel related APIs.
  std::unique_ptr<AMDGPUCallLowering> CallLoweringInfo;
  std::unique_ptr<InlineAsmLowering> InlineAsmLoweringInfo;
  std::unique_ptr<InstructionSelector> InstSelector;
  std::unique_ptr<LegalizerInfo> Legalizer;
  std::unique_ptr<RegisterBankInfo> RegBankInfo;
 
protected:
  // Basic subtarget description.
  Triple TargetTriple;
  AMDGPU::IsaInfo::AMDGPUTargetID TargetID;
  unsigned Gen;
  InstrItineraryData InstrItins;
  int LDSBankCount;
  unsigned MaxPrivateElementSize;
 
  // Possibly statically set by tablegen, but may want to be overridden.
  bool FastFMAF32;
  bool FastDenormalF32;
  bool HalfRate64Ops;
  bool FullRate64Ops;
 
  // Dynamically set bits that enable features.
  bool FlatForGlobal;
  bool AutoWaitcntBeforeBarrier;
  bool UnalignedScratchAccess;
  bool UnalignedAccessMode;
  bool HasApertureRegs;
  bool SupportsXNACK;
 
  // This should not be used directly. 'TargetID' tracks the dynamic settings
  // for XNACK.
  bool EnableXNACK;
 
  bool EnableTgSplit;
  bool EnableCuMode;
  bool TrapHandler;
 
  // Used as options.
  bool EnableLoadStoreOpt;
  bool EnableUnsafeDSOffsetFolding;
  bool EnableSIScheduler;
  bool EnableDS128;
  bool EnablePRTStrictNull;
  bool DumpCode;
 
  // Subtarget statically properties set by tablegen
  bool FP64;
  bool FMA;
  bool MIMG_R128;
  bool IsGCN;
  bool CIInsts;
  bool GFX8Insts;
  bool GFX9Insts;
  bool GFX90AInsts;
  bool GFX10Insts;
  bool GFX10_3Insts;
  bool GFX7GFX8GFX9Insts;
  bool SGPRInitBug;
  bool HasSMemRealTime;
  bool HasIntClamp;
  bool HasFmaMixInsts;
  bool HasMovrel;
  bool HasVGPRIndexMode;
  bool HasScalarStores;
  bool HasScalarAtomics;
  bool HasSDWAOmod;
  bool HasSDWAScalar;
  bool HasSDWASdst;
  bool HasSDWAMac;
  bool HasSDWAOutModsVOPC;
  bool HasDPP;
  bool HasDPP8;
  bool Has64BitDPP;
  bool HasPackedFP32Ops;
  bool HasExtendedImageInsts;
  bool HasR128A16;
  bool HasGFX10A16;
  bool HasG16;
  bool HasNSAEncoding;
  bool GFX10_BEncoding;
  bool HasDLInsts;
  bool HasDot1Insts;
  bool HasDot2Insts;
  bool HasDot3Insts;
  bool HasDot4Insts;
  bool HasDot5Insts;
  bool HasDot6Insts;
  bool HasDot7Insts;
  bool HasMAIInsts;
  bool HasPkFmacF16Inst;
  bool HasAtomicFaddInsts;
  bool SupportsSRAMECC;
 
  // This should not be used directly. 'TargetID' tracks the dynamic settings
  // for SRAMECC.
  bool EnableSRAMECC;
 
  bool HasNoSdstCMPX;
  bool HasVscnt;
  bool HasGetWaveIdInst;
  bool HasSMemTimeInst;
  bool HasShaderCyclesRegister;
  bool HasRegisterBanking;
  bool HasVOP3Literal;
  bool HasNoDataDepHazard;
  bool FlatAddressSpace;
  bool FlatInstOffsets;
  bool FlatGlobalInsts;
  bool FlatScratchInsts;
  bool ScalarFlatScratchInsts;
  bool AddNoCarryInsts;
  bool HasUnpackedD16VMem;
  bool R600ALUInst;
  bool CaymanISA;
  bool CFALUBug;
  bool LDSMisalignedBug;
  bool HasMFMAInlineLiteralBug;
  bool HasVertexCache;
  short TexVTXClauseSize;
  bool UnalignedBufferAccess;
  bool UnalignedDSAccess;
  bool HasPackedTID;
  bool ScalarizeGlobal;
 
  bool HasVcmpxPermlaneHazard;
  bool HasVMEMtoScalarWriteHazard;
  bool HasSMEMtoVectorWriteHazard;
  bool HasInstFwdPrefetchBug;
  bool HasVcmpxExecWARHazard;
  bool HasLdsBranchVmemWARHazard;
  bool HasNSAtoVMEMBug;
  bool HasOffset3fBug;
  bool HasFlatSegmentOffsetBug;
  bool HasImageStoreD16Bug;
  bool HasImageGather4D16Bug;
 
  // Dummy feature to use for assembler in tablegen.
  bool FeatureDisable;
 
  SelectionDAGTargetInfo TSInfo;
private:
  SIInstrInfo InstrInfo;
  SITargetLowering TLInfo;
  SIFrameLowering FrameLowering;
 
public:
  // See COMPUTE_TMPRING_SIZE.WAVESIZE, 13-bit field in units of 256-dword.
  static const unsigned MaxWaveScratchSize = (256 * 4) * ((1 << 13) - 1);
 
  GCNSubtarget(const Triple &TT, StringRef GPU, StringRef FS,
               const GCNTargetMachine &TM);
  ~GCNSubtarget() override;
 
  GCNSubtarget &initializeSubtargetDependencies(const Triple &TT,
                                                   StringRef GPU, StringRef FS);
 
  const SIInstrInfo *getInstrInfo() const override {
    return &InstrInfo;
  }
 
  const SIFrameLowering *getFrameLowering() const override {
    return &FrameLowering;
  }
 
  const SITargetLowering *getTargetLowering() const override {
    return &TLInfo;
  }
 
  const SIRegisterInfo *getRegisterInfo() const override {
    return &InstrInfo.getRegisterInfo();
  }
 
  const CallLowering *getCallLowering() const override {
    return CallLoweringInfo.get();
  }
 
  const InlineAsmLowering *getInlineAsmLowering() const override {
    return InlineAsmLoweringInfo.get();
  }
 
  InstructionSelector *getInstructionSelector() const override {
    return InstSelector.get();
  }
 
  const LegalizerInfo *getLegalizerInfo() const override {
    return Legalizer.get();
  }
 
  const RegisterBankInfo *getRegBankInfo() const override {
    return RegBankInfo.get();
  }
 
  const AMDGPU::IsaInfo::AMDGPUTargetID &getTargetID() const {
    return TargetID;
  }
 
  // Nothing implemented, just prevent crashes on use.
  const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
    return &TSInfo;
  }
 
  const InstrItineraryData *getInstrItineraryData() const override {
    return &InstrItins;
  }
 
  void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
 
  Generation getGeneration() const {
    return (Generation)Gen;
  }
 
  /// Return the number of high bits known to be zero fror a frame index.
  unsigned getKnownHighZeroBitsForFrameIndex() const {
    return countLeadingZeros(MaxWaveScratchSize) + getWavefrontSizeLog2();
  }
 
  int getLDSBankCount() const {
    return LDSBankCount;
  }
 
  unsigned getMaxPrivateElementSize(bool ForBufferRSrc = false) const {
    return (ForBufferRSrc || !enableFlatScratch()) ? MaxPrivateElementSize : 16;
  }
 
  unsigned getConstantBusLimit(unsigned Opcode) const;
 
  bool hasIntClamp() const {
    return HasIntClamp;
  }
 
  bool hasFP64() const {
    return FP64;
  }
 
  bool hasMIMG_R128() const {
    return MIMG_R128;
  }
 
  bool hasHWFP64() const {
    return FP64;
  }
 
  bool hasFastFMAF32() const {
    return FastFMAF32;
  }
 
  bool hasHalfRate64Ops() const {
    return HalfRate64Ops;
  }
 
  bool hasFullRate64Ops() const {
    return FullRate64Ops;
  }
 
  bool hasAddr64() const {
    return (getGeneration() < AMDGPUSubtarget::VOLCANIC_ISLANDS);
  }
 
  bool hasFlat() const {
    return (getGeneration() > AMDGPUSubtarget::SOUTHERN_ISLANDS);
  }
 
  // Return true if the target only has the reverse operand versions of VALU
  // shift instructions (e.g. v_lshrrev_b32, and no v_lshr_b32).
  bool hasOnlyRevVALUShifts() const {
    return getGeneration() >= VOLCANIC_ISLANDS;
  }
 
  bool hasFractBug() const {
    return getGeneration() == SOUTHERN_ISLANDS;
  }
 
  bool hasBFE() const {
    return true;
  }
 
  bool hasBFI() const {
    return true;
  }
 
  bool hasBFM() const {
    return hasBFE();
  }
 
  bool hasBCNT(unsigned Size) const {
    return true;
  }
 
  bool hasFFBL() const {
    return true;
  }
 
  bool hasFFBH() const {
    return true;
  }
 
  bool hasMed3_16() const {
    return getGeneration() >= AMDGPUSubtarget::GFX9;
  }
 
  bool hasMin3Max3_16() const {
    return getGeneration() >= AMDGPUSubtarget::GFX9;
  }
 
  bool hasFmaMixInsts() const {
    return HasFmaMixInsts;
  }
 
  bool hasCARRY() const {
    return true;
  }
 
  bool hasFMA() const {
    return FMA;
  }
 
  bool hasSwap() const {
    return GFX9Insts;
  }
 
  bool hasScalarPackInsts() const {
    return GFX9Insts;
  }
 
  bool hasScalarMulHiInsts() const {
    return GFX9Insts;
  }
 
  TrapHandlerAbi getTrapHandlerAbi() const {
    return isAmdHsaOS() ? TrapHandlerAbi::AMDHSA : TrapHandlerAbi::NONE;
  }
 
  bool supportsGetDoorbellID() const {
    // The S_GETREG DOORBELL_ID is supported by all GFX9 onward targets.
    return getGeneration() >= GFX9;
  }
 
  /// True if the offset field of DS instructions works as expected. On SI, the
  /// offset uses a 16-bit adder and does not always wrap properly.
  bool hasUsableDSOffset() const {
    return getGeneration() >= SEA_ISLANDS;
  }
 
  bool unsafeDSOffsetFoldingEnabled() const {
    return EnableUnsafeDSOffsetFolding;
  }
 
  /// Condition output from div_scale is usable.
  bool hasUsableDivScaleConditionOutput() const {
    return getGeneration() != SOUTHERN_ISLANDS;
  }
 
  /// Extra wait hazard is needed in some cases before
  /// s_cbranch_vccnz/s_cbranch_vccz.
  bool hasReadVCCZBug() const {
    return getGeneration() <= SEA_ISLANDS;
  }
 
  /// Writes to VCC_LO/VCC_HI update the VCCZ flag.
  bool partialVCCWritesUpdateVCCZ() const {
    return getGeneration() >= GFX10;
  }
 
  /// A read of an SGPR by SMRD instruction requires 4 wait states when the SGPR
  /// was written by a VALU instruction.
  bool hasSMRDReadVALUDefHazard() const {
    return getGeneration() == SOUTHERN_ISLANDS;
  }
 
  /// A read of an SGPR by a VMEM instruction requires 5 wait states when the
  /// SGPR was written by a VALU Instruction.
  bool hasVMEMReadSGPRVALUDefHazard() const {
    return getGeneration() >= VOLCANIC_ISLANDS;
  }
 
  bool hasRFEHazards() const {
    return getGeneration() >= VOLCANIC_ISLANDS;
  }
 
  /// Number of hazard wait states for s_setreg_b32/s_setreg_imm32_b32.
  unsigned getSetRegWaitStates() const {
    return getGeneration() <= SEA_ISLANDS ? 1 : 2;
  }
 
  bool dumpCode() const {
    return DumpCode;
  }
 
  /// Return the amount of LDS that can be used that will not restrict the
  /// occupancy lower than WaveCount.
  unsigned getMaxLocalMemSizeWithWaveCount(unsigned WaveCount,
                                           const Function &) const;
 
  bool supportsMinMaxDenormModes() const {
    return getGeneration() >= AMDGPUSubtarget::GFX9;
  }
 
  /// \returns If target supports S_DENORM_MODE.
  bool hasDenormModeInst() const {
    return getGeneration() >= AMDGPUSubtarget::GFX10;
  }
 
  bool useFlatForGlobal() const {
    return FlatForGlobal;
  }
 
  /// \returns If target supports ds_read/write_b128 and user enables generation
  /// of ds_read/write_b128.
  bool useDS128() const {
    return CIInsts && EnableDS128;
  }
 
  /// \return If target supports ds_read/write_b96/128.
  bool hasDS96AndDS128() const {
    return CIInsts;
  }
 
  /// Have v_trunc_f64, v_ceil_f64, v_rndne_f64
  bool haveRoundOpsF64() const {
    return CIInsts;
  }
 
  /// \returns If MUBUF instructions always perform range checking, even for
  /// buffer resources used for private memory access.
  bool privateMemoryResourceIsRangeChecked() const {
    return getGeneration() < AMDGPUSubtarget::GFX9;
  }
 
  /// \returns If target requires PRT Struct NULL support (zero result registers
  /// for sparse texture support).
  bool usePRTStrictNull() const {
    return EnablePRTStrictNull;
  }
 
  bool hasAutoWaitcntBeforeBarrier() const {
    return AutoWaitcntBeforeBarrier;
  }
 
  bool hasUnalignedBufferAccess() const {
    return UnalignedBufferAccess;
  }
 
  bool hasUnalignedBufferAccessEnabled() const {
    return UnalignedBufferAccess && UnalignedAccessMode;
  }
 
  bool hasUnalignedDSAccess() const {
    return UnalignedDSAccess;
  }
 
  bool hasUnalignedDSAccessEnabled() const {
    return UnalignedDSAccess && UnalignedAccessMode;
  }
 
  bool hasUnalignedScratchAccess() const {
    return UnalignedScratchAccess;
  }
 
  bool hasUnalignedAccessMode() const {
    return UnalignedAccessMode;
  }
 
  bool hasApertureRegs() const {
    return HasApertureRegs;
  }
 
  bool isTrapHandlerEnabled() const {
    return TrapHandler;
  }
 
  bool isXNACKEnabled() const {
    return TargetID.isXnackOnOrAny();
  }
 
  bool isTgSplitEnabled() const {
    return EnableTgSplit;
  }
 
  bool isCuModeEnabled() const {
    return EnableCuMode;
  }
 
  bool hasFlatAddressSpace() const {
    return FlatAddressSpace;
  }
 
  bool hasFlatScrRegister() const {
    return hasFlatAddressSpace();
  }
 
  bool hasFlatInstOffsets() const {
    return FlatInstOffsets;
  }
 
  bool hasFlatGlobalInsts() const {
    return FlatGlobalInsts;
  }
 
  bool hasFlatScratchInsts() const {
    return FlatScratchInsts;
  }
 
  // Check if target supports ST addressing mode with FLAT scratch instructions.
  // The ST addressing mode means no registers are used, either VGPR or SGPR,
  // but only immediate offset is swizzled and added to the FLAT scratch base.
  bool hasFlatScratchSTMode() const {
    return hasFlatScratchInsts() && hasGFX10_3Insts();
  }
 
  bool hasScalarFlatScratchInsts() const {
    return ScalarFlatScratchInsts;
  }
 
  bool hasGlobalAddTidInsts() const {
    return GFX10_BEncoding;
  }
 
  bool hasAtomicCSub() const {
    return GFX10_BEncoding;
  }
 
  bool hasMultiDwordFlatScratchAddressing() const {
    return getGeneration() >= GFX9;
  }
 
  bool hasFlatSegmentOffsetBug() const {
    return HasFlatSegmentOffsetBug;
  }
 
  bool hasFlatLgkmVMemCountInOrder() const {
    return getGeneration() > GFX9;
  }
 
  bool hasD16LoadStore() const {
    return getGeneration() >= GFX9;
  }
 
  bool d16PreservesUnusedBits() const {
    return hasD16LoadStore() && !TargetID.isSramEccOnOrAny();
  }
 
  bool hasD16Images() const {
    return getGeneration() >= VOLCANIC_ISLANDS;
  }
 
  /// Return if most LDS instructions have an m0 use that require m0 to be
  /// iniitalized.
  bool ldsRequiresM0Init() const {
    return getGeneration() < GFX9;
  }
 
  // True if the hardware rewinds and replays GWS operations if a wave is
  // preempted.
  //
  // If this is false, a GWS operation requires testing if a nack set the
  // MEM_VIOL bit, and repeating if so.
  bool hasGWSAutoReplay() const {
    return getGeneration() >= GFX9;
  }
 
  /// \returns if target has ds_gws_sema_release_all instruction.
  bool hasGWSSemaReleaseAll() const {
    return CIInsts;
  }
 
  /// \returns true if the target has integer add/sub instructions that do not
  /// produce a carry-out. This includes v_add_[iu]32, v_sub_[iu]32,
  /// v_add_[iu]16, and v_sub_[iu]16, all of which support the clamp modifier
  /// for saturation.
  bool hasAddNoCarry() const {
    return AddNoCarryInsts;
  }
 
  bool hasUnpackedD16VMem() const {
    return HasUnpackedD16VMem;
  }
 
  // Covers VS/PS/CS graphics shaders
  bool isMesaGfxShader(const Function &F) const {
    return isMesa3DOS() && AMDGPU::isShader(F.getCallingConv());
  }
 
  bool hasMad64_32() const {
    return getGeneration() >= SEA_ISLANDS;
  }
 
  bool hasSDWAOmod() const {
    return HasSDWAOmod;
  }
 
  bool hasSDWAScalar() const {
    return HasSDWAScalar;
  }
 
  bool hasSDWASdst() const {
    return HasSDWASdst;
  }
 
  bool hasSDWAMac() const {
    return HasSDWAMac;
  }
 
  bool hasSDWAOutModsVOPC() const {
    return HasSDWAOutModsVOPC;
  }
 
  bool hasDLInsts() const {
    return HasDLInsts;
  }
 
  bool hasDot1Insts() const {
    return HasDot1Insts;
  }
 
  bool hasDot2Insts() const {
    return HasDot2Insts;
  }
 
  bool hasDot3Insts() const {
    return HasDot3Insts;
  }
 
  bool hasDot4Insts() const {
    return HasDot4Insts;
  }
 
  bool hasDot5Insts() const {
    return HasDot5Insts;
  }
 
  bool hasDot6Insts() const {
    return HasDot6Insts;
  }
 
  bool hasDot7Insts() const {
    return HasDot7Insts;
  }
 
  bool hasMAIInsts() const {
    return HasMAIInsts;
  }
 
  bool hasPkFmacF16Inst() const {
    return HasPkFmacF16Inst;
  }
 
  bool hasAtomicFaddInsts() const {
    return HasAtomicFaddInsts;
  }
 
  bool hasNoSdstCMPX() const {
    return HasNoSdstCMPX;
  }
 
  bool hasVscnt() const {
    return HasVscnt;
  }
 
  bool hasGetWaveIdInst() const {
    return HasGetWaveIdInst;
  }
 
  bool hasSMemTimeInst() const {
    return HasSMemTimeInst;
  }
 
  bool hasShaderCyclesRegister() const {
    return HasShaderCyclesRegister;
  }
 
  bool hasRegisterBanking() const {
    return HasRegisterBanking;
  }
 
  bool hasVOP3Literal() const {
    return HasVOP3Literal;
  }
 
  bool hasNoDataDepHazard() const {
    return HasNoDataDepHazard;
  }
 
  bool vmemWriteNeedsExpWaitcnt() const {
    return getGeneration() < SEA_ISLANDS;
  }
 
  // Scratch is allocated in 256 dword per wave blocks for the entire
  // wavefront. When viewed from the perspecive of an arbitrary workitem, this
  // is 4-byte aligned.
  //
  // Only 4-byte alignment is really needed to access anything. Transformations
  // on the pointer value itself may rely on the alignment / known low bits of
  // the pointer. Set this to something above the minimum to avoid needing
  // dynamic realignment in common cases.
  Align getStackAlignment() const { return Align(16); }
 
  bool enableMachineScheduler() const override {
    return true;
  }
 
  bool useAA() const override;
 
  bool enableSubRegLiveness() const override {
    return true;
  }
 
  void setScalarizeGlobalBehavior(bool b) { ScalarizeGlobal = b; }
  bool getScalarizeGlobalBehavior() const { return ScalarizeGlobal; }
 
  // static wrappers
  static bool hasHalfRate64Ops(const TargetSubtargetInfo &STI);
 
  // XXX - Why is this here if it isn't in the default pass set?
  bool enableEarlyIfConversion() const override {
    return true;
  }
 
  bool enableFlatScratch() const;
 
  void overrideSchedPolicy(MachineSchedPolicy &Policy,
                           unsigned NumRegionInstrs) const override;
 
  unsigned getMaxNumUserSGPRs() const {
    return 16;
  }
 
  bool hasSMemRealTime() const {
    return HasSMemRealTime;
  }
 
  bool hasMovrel() const {
    return HasMovrel;
  }
 
  bool hasVGPRIndexMode() const {
    return HasVGPRIndexMode;
  }
 
  bool useVGPRIndexMode() const;
 
  bool hasScalarCompareEq64() const {
    return getGeneration() >= VOLCANIC_ISLANDS;
  }
 
  bool hasScalarStores() const {
    return HasScalarStores;
  }
 
  bool hasScalarAtomics() const {
    return HasScalarAtomics;
  }
 
  bool hasLDSFPAtomics() const {
    return GFX8Insts;
  }
 
  /// \returns true if the subtarget has the v_permlanex16_b32 instruction.
  bool hasPermLaneX16() const { return getGeneration() >= GFX10; }
 
  bool hasDPP() const {
    return HasDPP;
  }
 
  bool hasDPPBroadcasts() const {
    return HasDPP && getGeneration() < GFX10;
  }
 
  bool hasDPPWavefrontShifts() const {
    return HasDPP && getGeneration() < GFX10;
  }
 
  bool hasDPP8() const {
    return HasDPP8;
  }
 
  bool has64BitDPP() const {
    return Has64BitDPP;
  }
 
  bool hasPackedFP32Ops() const {
    return HasPackedFP32Ops;
  }
 
  bool hasExtendedImageInsts() const {
    return HasExtendedImageInsts;
  }
 
  bool hasR128A16() const {
    return HasR128A16;
  }
 
  bool hasGFX10A16() const {
    return HasGFX10A16;
  }
 
  bool hasA16() const { return hasR128A16() || hasGFX10A16(); }
 
  bool hasG16() const { return HasG16; }
 
  bool hasOffset3fBug() const {
    return HasOffset3fBug;
  }
 
  bool hasImageStoreD16Bug() const { return HasImageStoreD16Bug; }
 
  bool hasImageGather4D16Bug() const { return HasImageGather4D16Bug; }
 
  bool hasNSAEncoding() const { return HasNSAEncoding; }
 
  bool hasGFX10_BEncoding() const {
    return GFX10_BEncoding;
  }
 
  bool hasGFX10_3Insts() const {
    return GFX10_3Insts;
  }
 
  bool hasMadF16() const;
 
  bool enableSIScheduler() const {
    return EnableSIScheduler;
  }
 
  bool loadStoreOptEnabled() const {
    return EnableLoadStoreOpt;
  }
 
  bool hasSGPRInitBug() const {
    return SGPRInitBug;
  }
 
  bool hasMFMAInlineLiteralBug() const {
    return HasMFMAInlineLiteralBug;
  }
 
  bool has12DWordStoreHazard() const {
    return getGeneration() != AMDGPUSubtarget::SOUTHERN_ISLANDS;
  }
 
  // \returns true if the subtarget supports DWORDX3 load/store instructions.
  bool hasDwordx3LoadStores() const {
    return CIInsts;
  }
 
  bool hasReadM0MovRelInterpHazard() const {
    return getGeneration() == AMDGPUSubtarget::GFX9;
  }
 
  bool hasReadM0SendMsgHazard() const {
    return getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS &&
           getGeneration() <= AMDGPUSubtarget::GFX9;
  }
 
  bool hasVcmpxPermlaneHazard() const {
    return HasVcmpxPermlaneHazard;
  }
 
  bool hasVMEMtoScalarWriteHazard() const {
    return HasVMEMtoScalarWriteHazard;
  }
 
  bool hasSMEMtoVectorWriteHazard() const {
    return HasSMEMtoVectorWriteHazard;
  }
 
  bool hasLDSMisalignedBug() const {
    return LDSMisalignedBug && !EnableCuMode;
  }
 
  bool hasInstFwdPrefetchBug() const {
    return HasInstFwdPrefetchBug;
  }
 
  bool hasVcmpxExecWARHazard() const {
    return HasVcmpxExecWARHazard;
  }
 
  bool hasLdsBranchVmemWARHazard() const {
    return HasLdsBranchVmemWARHazard;
  }
 
  bool hasNSAtoVMEMBug() const {
    return HasNSAtoVMEMBug;
  }
 
  bool hasHardClauses() const { return getGeneration() >= GFX10; }
 
  bool hasGFX90AInsts() const { return GFX90AInsts; }
 
  /// Return if operations acting on VGPR tuples require even alignment.
  bool needsAlignedVGPRs() const { return GFX90AInsts; }
 
  bool hasPackedTID() const { return HasPackedTID; }
 
  /// Return the maximum number of waves per SIMD for kernels using \p SGPRs
  /// SGPRs
  unsigned getOccupancyWithNumSGPRs(unsigned SGPRs) const;
 
  /// Return the maximum number of waves per SIMD for kernels using \p VGPRs
  /// VGPRs
  unsigned getOccupancyWithNumVGPRs(unsigned VGPRs) const;
 
  /// Return occupancy for the given function. Used LDS and a number of
  /// registers if provided.
  /// Note, occupancy can be affected by the scratch allocation as well, but
  /// we do not have enough information to compute it.
  unsigned computeOccupancy(const Function &F, unsigned LDSSize = 0,
                            unsigned NumSGPRs = 0, unsigned NumVGPRs = 0) const;
 
  /// \returns true if the flat_scratch register should be initialized with the
  /// pointer to the wave's scratch memory rather than a size and offset.
  bool flatScratchIsPointer() const {
    return getGeneration() >= AMDGPUSubtarget::GFX9;
  }
 
  /// \returns true if the machine has merged shaders in which s0-s7 are
  /// reserved by the hardware and user SGPRs start at s8
  bool hasMergedShaders() const {
    return getGeneration() >= GFX9;
  }
 
  /// \returns SGPR allocation granularity supported by the subtarget.
  unsigned getSGPRAllocGranule() const {
    return AMDGPU::IsaInfo::getSGPRAllocGranule(this);
  }
 
  /// \returns SGPR encoding granularity supported by the subtarget.
  unsigned getSGPREncodingGranule() const {
    return AMDGPU::IsaInfo::getSGPREncodingGranule(this);
  }
 
  /// \returns Total number of SGPRs supported by the subtarget.
  unsigned getTotalNumSGPRs() const {
    return AMDGPU::IsaInfo::getTotalNumSGPRs(this);
  }
 
  /// \returns Addressable number of SGPRs supported by the subtarget.
  unsigned getAddressableNumSGPRs() const {
    return AMDGPU::IsaInfo::getAddressableNumSGPRs(this);
  }
 
  /// \returns Minimum number of SGPRs that meets the given number of waves per
  /// execution unit requirement supported by the subtarget.
  unsigned getMinNumSGPRs(unsigned WavesPerEU) const {
    return AMDGPU::IsaInfo::getMinNumSGPRs(this, WavesPerEU);
  }
 
  /// \returns Maximum number of SGPRs that meets the given number of waves per
  /// execution unit requirement supported by the subtarget.
  unsigned getMaxNumSGPRs(unsigned WavesPerEU, bool Addressable) const {
    return AMDGPU::IsaInfo::getMaxNumSGPRs(this, WavesPerEU, Addressable);
  }
 
  /// \returns Reserved number of SGPRs for given function \p MF.
  unsigned getReservedNumSGPRs(const MachineFunction &MF) const;
 
  /// \returns Maximum number of SGPRs that meets number of waves per execution
  /// unit requirement for function \p MF, or number of SGPRs explicitly
  /// requested using "amdgpu-num-sgpr" attribute attached to function \p MF.
  ///
  /// \returns Value that meets number of waves per execution unit requirement
  /// if explicitly requested value cannot be converted to integer, violates
  /// subtarget's specifications, or does not meet number of waves per execution
  /// unit requirement.
  unsigned getMaxNumSGPRs(const MachineFunction &MF) const;
 
  /// \returns VGPR allocation granularity supported by the subtarget.
  unsigned getVGPRAllocGranule() const {
    return AMDGPU::IsaInfo::getVGPRAllocGranule(this);
  }
 
  /// \returns VGPR encoding granularity supported by the subtarget.
  unsigned getVGPREncodingGranule() const {
    return AMDGPU::IsaInfo::getVGPREncodingGranule(this);
  }
 
  /// \returns Total number of VGPRs supported by the subtarget.
  unsigned getTotalNumVGPRs() const {
    return AMDGPU::IsaInfo::getTotalNumVGPRs(this);
  }
 
  /// \returns Addressable number of VGPRs supported by the subtarget.
  unsigned getAddressableNumVGPRs() const {
    return AMDGPU::IsaInfo::getAddressableNumVGPRs(this);
  }
 
  /// \returns Minimum number of VGPRs that meets given number of waves per
  /// execution unit requirement supported by the subtarget.
  unsigned getMinNumVGPRs(unsigned WavesPerEU) const {
    return AMDGPU::IsaInfo::getMinNumVGPRs(this, WavesPerEU);
  }
 
  /// \returns Maximum number of VGPRs that meets given number of waves per
  /// execution unit requirement supported by the subtarget.
  unsigned getMaxNumVGPRs(unsigned WavesPerEU) const {
    return AMDGPU::IsaInfo::getMaxNumVGPRs(this, WavesPerEU);
  }
 
  /// \returns Maximum number of VGPRs that meets number of waves per execution
  /// unit requirement for function \p MF, or number of VGPRs explicitly
  /// requested using "amdgpu-num-vgpr" attribute attached to function \p MF.
  ///
  /// \returns Value that meets number of waves per execution unit requirement
  /// if explicitly requested value cannot be converted to integer, violates
  /// subtarget's specifications, or does not meet number of waves per execution
  /// unit requirement.
  unsigned getMaxNumVGPRs(const MachineFunction &MF) const;
 
  void getPostRAMutations(
      std::vector<std::unique_ptr<ScheduleDAGMutation>> &Mutations)
      const override;
 
  bool isWave32() const {
    return getWavefrontSize() == 32;
  }
 
  bool isWave64() const {
    return getWavefrontSize() == 64;
  }
 
  const TargetRegisterClass *getBoolRC() const {
    return getRegisterInfo()->getBoolRC();
  }
 
  /// \returns Maximum number of work groups per compute unit supported by the
  /// subtarget and limited by given \p FlatWorkGroupSize.
  unsigned getMaxWorkGroupsPerCU(unsigned FlatWorkGroupSize) const override {
    return AMDGPU::IsaInfo::getMaxWorkGroupsPerCU(this, FlatWorkGroupSize);
  }
 
  /// \returns Minimum flat work group size supported by the subtarget.
  unsigned getMinFlatWorkGroupSize() const override {
    return AMDGPU::IsaInfo::getMinFlatWorkGroupSize(this);
  }
 
  /// \returns Maximum flat work group size supported by the subtarget.
  unsigned getMaxFlatWorkGroupSize() const override {
    return AMDGPU::IsaInfo::getMaxFlatWorkGroupSize(this);
  }
 
  /// \returns Number of waves per execution unit required to support the given
  /// \p FlatWorkGroupSize.
  unsigned
  getWavesPerEUForWorkGroup(unsigned FlatWorkGroupSize) const override {
    return AMDGPU::IsaInfo::getWavesPerEUForWorkGroup(this, FlatWorkGroupSize);
  }
 
  /// \returns Minimum number of waves per execution unit supported by the
  /// subtarget.
  unsigned getMinWavesPerEU() const override {
    return AMDGPU::IsaInfo::getMinWavesPerEU(this);
  }
 
  void adjustSchedDependency(SUnit *Def, int DefOpIdx, SUnit *Use, int UseOpIdx,
                             SDep &Dep) const override;
};
 
} // end namespace llvm
 
#endif // LLVM_LIB_TARGET_AMDGPU_GCNSUBTARGET_H