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

Copyright (C) 2024 Intel Corporation

SPDX-License-Identifier: MIT

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

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

#include "Compiler/CodeGenContextWrapper.hpp"

#include <unordered_map>

namespace IGC {
enum Accuracy { HIGH_ACCURACY, LOW_ACCURACY, ENHANCED_PERFORMANCE, CORRECTLY_ROUNDED };

class AccuracyDecoratedCallsBiFResolution : public llvm::ModulePass,
                                            public llvm::InstVisitor<AccuracyDecoratedCallsBiFResolution> {
public:
  // Accuracy --> Builtin (3 entries in each AccurateBuiltins)
  typedef std::unordered_map<Accuracy, std::string> AccurateBuiltins;

  static char ID;

  AccuracyDecoratedCallsBiFResolution();
  ~AccuracyDecoratedCallsBiFResolution() {}

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

  virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override { AU.addRequired<CodeGenContextWrapper>(); }

  void initNameToBuiltinMap();

  void visitCallInst(llvm::CallInst &callInst);
  void visitBinaryOperator(llvm::BinaryOperator &inst);

  virtual bool runOnModule(llvm::Module &M) override;

private:
  bool m_changed = false;
  llvm::Module *m_Module = nullptr;
  // m_nameToBuiltin["_Z15__spirv_ocl_sinf"][ENHANCED_PERFORMANCE] --> "__ocl_svml_sinf_ep"
  std::unordered_map<std::string, AccurateBuiltins> m_nameToBuiltin{};

  llvm::Function *getOrInsertNewFunc(const llvm::StringRef oldFuncName, llvm::Type *funcType,
                                     const llvm::ArrayRef<llvm::Value *> args, const llvm::AttributeList attributes,
                                     llvm::CallingConv::ID callingConv, const llvm::StringRef maxErrorStr,
                                     const llvm::Instruction *currInst);
  std::string getFunctionName(const llvm::StringRef oldFuncName, Accuracy accuracy,
                              const llvm::Instruction *currInst) const;
  Accuracy getAccuracy(double maxError, double cutOff, const llvm::Instruction *currInst) const;
};
} // namespace IGC
