llvm-6502/lib/Target/Hexagon/HexagonSubtarget.h

//===-- 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(const Triple &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