Finish the design of data path, including adder, shifter, ROM and the control logic of the rotation, and optimize these parts in terms of the requirement of Longtium C2 microprocessor.

• 完成超越函数实现的数据路径设计，主要包括加法器、移位器、常数ROM和旋转控制逻辑，同时针对“龙腾”C2微处理器的性能要求对各个部件进行优化设计。