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

Copyright (C) 2017-2021 Intel Corporation

SPDX-License-Identifier: MIT

============================= end_copyright_notice ===========================*/

#pragma once
#include "Compiler/CodeGenContextWrapper.hpp"

#include "common/LLVMWarningsPush.hpp"
#include <llvm/Pass.h>
#include <llvm/IR/InstVisitor.h>
#include <llvm/ADT/DenseSet.h>
#include "common/LLVMWarningsPop.hpp"

namespace IGC {
/// @brief  This pass unset fast math flag on all instructions which influence position output
class PositionDepAnalysis : public llvm::FunctionPass, public llvm::InstVisitor<PositionDepAnalysis> {
public:
  /// @brief  Pass identification.
  static char ID;

  PositionDepAnalysis();

  ~PositionDepAnalysis() {}

  void visitCallInst(llvm::CallInst &I);

  virtual llvm::StringRef getPassName() const override { return "SetMathPrecisionForPositionOutput"; }

  virtual bool runOnFunction(llvm::Function &F) override;

  virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
    AU.setPreservesAll();
    AU.addRequired<CodeGenContextWrapper>();
  }
  bool PositionDependsOnInst(llvm::Instruction *inst);

private:
  void UpdateDependency(llvm::Instruction *inst);
  llvm::DenseSet<llvm::Instruction *> m_PositionDep;
  bool m_newURBEncoding = false;
};

} // namespace IGC