EpiphanySubtarget.h

//==-- EpiphanySubtarget.h - Define Subtarget for the Epiphany ---*- 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 Epiphany specific subclass of TargetSubtargetInfo.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TARGET_EPIPHANY_SUBTARGET_H
#define LLVM_TARGET_EPIPHANY_SUBTARGET_H

#include "EpiphanyFrameLowering.h"
#include "EpiphanyISelLowering.h"
#include "EpiphanyInstrInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
#include <string>

#define GET_SUBTARGETINFO_HEADER
#include "EpiphanyGenSubtargetInfo.inc"

namespace llvm {
class StringRef;
class EpiphanyTargetMachine;

class EpiphanySubtarget : public EpiphanyGenSubtargetInfo {
  virtual void anchor();

protected:
  enum EpiphanyArchEnum {
    E16
  };
  // Epiphany architecture version
  EpiphanyArchEnum EpiphanyArchVersion;
  // HasCmp - cmp instructions.
  bool HasCmp = false;
  // Itinerary data
  InstrItineraryData InstrItins;
  // Target Machine
  const EpiphanyTargetMachine &TM;
  // Target Triple
  Triple TargetTriple;
  
  const SelectionDAGTargetInfo TSInfo;

  std::unique_ptr<const EpiphanyInstrInfo> InstrInfo;
  std::unique_ptr<const EpiphanyFrameLowering> FrameLowering;
  std::unique_ptr<const EpiphanyTargetLowering> TLInfo;

public:
  const EpiphanyABIInfo &getABI() const;
  /// This constructor initializes the data members to match that
  /// of the specified triple.
  ///
  EpiphanySubtarget(const Triple &TT, const std::string &CPU, 
                    const std::string &FS, const EpiphanyTargetMachine &TM);
                    
  /// ParseSubtargetFeatures - Parses features string setting specified
  /// subtarget options.  Definition of function is auto generated by tblgen.
  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
  
  bool isE16() const { return EpiphanyArchVersion == E16; }

  bool abiUsesSoftFloat() const;
  
  bool hasCmp() const { return HasCmp; }

  unsigned stackAlignment() const { return 2; }
  unsigned stackOffset() const { return 8; }

  EpiphanySubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS,
                                                     const TargetMachine &TM);
  
  const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
    return &TSInfo;
  }

  const EpiphanyInstrInfo *getInstrInfo() const override { return InstrInfo.get(); }

  const EpiphanyFrameLowering *getFrameLowering() const override { return FrameLowering.get(); }

  const EpiphanyTargetLowering *getTargetLowering() const override { return TLInfo.get(); }

  const EpiphanyRegisterInfo *getRegisterInfo() const override { return &InstrInfo->getRegisterInfo(); }
  
  const InstrItineraryData *getInstrItineraryData() const override {
    return &InstrItins;
  }

  AntiDepBreakMode getAntiDepBreakMode() const override { return ANTIDEP_ALL; }

  bool enablePostRAScheduler() const override { return true; }

};
} // End llvm namespace

#endif  // LLVM_TARGET_EPIPHANY_SUBTARGET_H