/*===================== begin_copyright_notice ==================================

Copyright (c) 2017 Intel Corporation

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
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The above copyright notice and this permission notice shall be included
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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======================= end_copyright_notice ==================================*/

// vim:ts=2:sw=2::et:

#ifndef LEGALIZER_PeepholeTypeLegalizer_H
#define LEGALIZER_PeepholeTypeLegalizer_H

#include "common/LLVMWarningsPush.hpp"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/Pass.h"
#include "llvm/PassAnalysisSupport.h"
#include "llvm/Analysis/TargetFolder.h"
#include "llvm/IR/InstVisitor.h"
#include "common/LLVMWarningsPop.hpp"
#include "common/Types.hpp"

namespace IGC {

namespace Legalizer {

  using namespace llvm;

  class PeepholeTypeLegalizer : public FunctionPass, public InstVisitor<PeepholeTypeLegalizer> {
	  llvm::IRBuilder<>* m_builder;
	  Module *TheModule;
	  Function *TheFunction;

  public:
	  static char ID;

	  PeepholeTypeLegalizer();

	  bool runOnFunction(Function &F) override;

	  void visitInstruction(Instruction &I);
      void legalizePhiInstruction(Instruction &I);
	  void legalizeUnaryInstruction(Instruction &I);
	  void legalizeBinaryOperator(Instruction &I);
      void legalizeExtractElement(Instruction &I);
	  void cleanupZExtInst(Instruction &I);
	  void cleanupBitCastInst(Instruction &I);

  private:
	  bool NonBitcastInstructionsLegalized;
	  bool CastInst_ZExtWithIntermediateIllegalsEliminated;
	  bool Bitcast_BitcastWithIntermediateIllegalsEliminated;
	  bool Changed;

	  const DataLayout *DL;

	  void getAnalysisUsage(AnalysisUsage &AU) const override;

	  LLVMContext &getContext() const { return TheModule->getContext(); }
	  Module *getModule() const { return TheModule; }
	  Function *getFunction() const { return TheFunction; }
	  bool isLegalInteger(unsigned int bitWidth) {
		  if (bitWidth == 64)
			  return true;
		  else
			  return DL->isLegalInteger(bitWidth);
	  }

  };
} // End Legalizer namespace

} // End IGC namespace

#endif // LEGALIZER_TYPELEGALIZER_H
