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//== ----- llvm/CodeGen/GlobalISel/Combiner.h -------------------*- 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

/// This contains common code to drive combines. Combiner Passes will need to

/// setup a CombinerInfo and call combineMachineFunction.

///

//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_GLOBALISEL_COMBINER_H

#define LLVM_CODEGEN_GLOBALISEL_COMBINER_H

#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"

namespace llvm {

class MachineRegisterInfo;

class CombinerInfo;

class GISelCSEInfo;

class TargetPassConfig;

class MachineFunction;

class Combiner {

public:

  Combiner(CombinerInfo &CombinerInfo, const TargetPassConfig *TPC);

  /// If CSEInfo is not null, then the Combiner will setup observer for

  /// CSEInfo and instantiate a CSEMIRBuilder. Pass nullptr if CSE is not

  /// needed.

  bool combineMachineInstrs(MachineFunction &MF, GISelCSEInfo *CSEInfo);

protected:

  CombinerInfo &CInfo;

  MachineRegisterInfo *MRI = nullptr;

  const TargetPassConfig *TPC;

  std::unique_ptr<MachineIRBuilder> Builder;

};

} // End namespace llvm.

#endif // LLVM_CODEGEN_GLOBALISEL_COMBINER_H