std::function<std::unique_ptr<TargetHardware>()> target_hardware_factory;
};

struct RegisteredTargetHardwareOps {
  explicit RegisteredTargetHardwareOps(mlir::TypeID hardware_type)
      : hardware_typeid(hardware_type) {}
  // Key is the Operation TypeID
  llvm::DenseMap<mlir::TypeID, std::unique_ptr<TargetHardwareOperation>>
      target_hardware_ops;
  // Key is the Operation TypeID
  llvm::DenseMap<mlir::TypeID,

// DEPRECATED: Do not use, prefer RegisterTargetHardwareOpFactory intstead.
void RegisterTargetHardwareOp(
    mlir::TypeID hardware_type, mlir::TypeID op_type,
    std::function<std::unique_ptr<TargetHardwareOperation>()>
        target_hardware_op_factory);

void RegisterTargetHardwareOpFactory(
    mlir::TypeID hardware_type, mlir::TypeID op_type,
    std::function<std::unique_ptr<TargetHardwareOperation>()>
        target_hardware_op_factory);