text: //===-- HexagonSubtarget.h - Define Subtarget for the Hexagon ---*- C++ -*-===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  //
  // This file declares the Hexagon specific subclass of TargetSubtarget.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONSUBTARGET_H
  #define LLVM_LIB_TARGET_HEXAGON_HEXAGONSUBTARGET_H
  
  #include "HexagonFrameLowering.h"
  #include "HexagonISelLowering.h"
  #include "HexagonInstrInfo.h"
  #include "HexagonSelectionDAGInfo.h"
  #include "llvm/IR/DataLayout.h"
  #include "llvm/Target/TargetMachine.h"
  #include "llvm/Target/TargetSubtargetInfo.h"
  #include <string>
  
  #define GET_SUBTARGETINFO_HEADER
  #include "HexagonGenSubtargetInfo.inc"
  
  #define Hexagon_SMALL_DATA_THRESHOLD 8
  #define Hexagon_SLOTS 4
  
  namespace llvm {
  
  class HexagonSubtarget : public HexagonGenSubtargetInfo {
    virtual void anchor();
  
    bool UseMemOps;
    bool ModeIEEERndNear;
  
  public:
    enum HexagonArchEnum {
      V4, V5
    };
  
    HexagonArchEnum HexagonArchVersion;
  private:
    std::string CPUString;
    HexagonInstrInfo InstrInfo;
    HexagonTargetLowering TLInfo;
    HexagonSelectionDAGInfo TSInfo;
    HexagonFrameLowering FrameLowering;
    InstrItineraryData InstrItins;
  
  public:
    HexagonSubtarget(StringRef TT, StringRef CPU, StringRef FS,
                     const TargetMachine &TM);
  
    /// getInstrItins - Return the instruction itineraries based on subtarget
    /// selection.
    const InstrItineraryData *getInstrItineraryData() const override {
      return &InstrItins;
    }
    const HexagonInstrInfo *getInstrInfo() const override { return &InstrInfo; }
    const HexagonRegisterInfo *getRegisterInfo() const override {
      return &InstrInfo.getRegisterInfo();
    }
    const HexagonTargetLowering *getTargetLowering() const override {
      return &TLInfo;
    }
    const HexagonFrameLowering *getFrameLowering() const override {
      return &FrameLowering;
    }
    const HexagonSelectionDAGInfo *getSelectionDAGInfo() const override {
      return &TSInfo;
    }
  
    HexagonSubtarget &initializeSubtargetDependencies(StringRef CPU,
                                                      StringRef FS);
  
    /// ParseSubtargetFeatures - Parses features string setting specified
    /// subtarget options.  Definition of function is auto generated by tblgen.
    void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
  
    bool useMemOps() const { return UseMemOps; }
    bool hasV5TOps() const { return getHexagonArchVersion() >= V5; }
    bool hasV5TOpsOnly() const { return getHexagonArchVersion() == V5; }
    bool modeIEEERndNear() const { return ModeIEEERndNear; }
    bool enableMachineScheduler() const override;
    // Always use the TargetLowering default scheduler.
    // FIXME: This will use the vliw scheduler which is probably just hurting
    // compiler time and will be removed eventually anyway.
    bool enableMachineSchedDefaultSched() const override { return false; }
  
    const std::string &getCPUString () const { return CPUString; }
  
    // Threshold for small data section
    unsigned getSmallDataThreshold() const {
      return Hexagon_SMALL_DATA_THRESHOLD;
    }
    const HexagonArchEnum &getHexagonArchVersion() const {
      return  HexagonArchVersion;
    }
  };
  
  } // end namespace llvm
  
  #endif
  