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//===---- Mips16ISelDAGToDAG.h - A Dag to Dag Inst Selector for Mips ------===//
//                     The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// Subclass of MipsDAGToDAGISel specialized for mips16.


#include "MipsISelDAGToDAG.h"

namespace llvm {

class Mips16DAGToDAGISel : public MipsDAGToDAGISel {
  explicit Mips16DAGToDAGISel(MipsTargetMachine &TM) : MipsDAGToDAGISel(TM) {}

  std::pair<SDNode*, SDNode*> selectMULT(SDNode *N, unsigned Opc, SDLoc DL,
                                         EVT Ty, bool HasLo, bool HasHi);

  SDValue getMips16SPAliasReg();

  bool runOnMachineFunction(MachineFunction &MF) override;

  void getMips16SPRefReg(SDNode *Parent, SDValue &AliasReg);

  bool selectAddr16(SDNode *Parent, SDValue N, SDValue &Base,
                    SDValue &Offset, SDValue &Alias) override;

  std::pair<bool, SDNode*> selectNode(SDNode *Node) override;

  void processFunctionAfterISel(MachineFunction &MF) override;

  // Insert instructions to initialize the global base register in the
  // first MBB of the function.
  void initGlobalBaseReg(MachineFunction &MF);

  void initMips16SPAliasReg(MachineFunction &MF);

FunctionPass *createMips16ISelDag(MipsTargetMachine &TM);