Complete the design of control path, including the entire structure of the control path, the control in terms of the different instructions, the control of several operations, and the detection of the exception of FPU.

• 完成了超越函数实现的控制路径设计，主要包括控制路径的整体结构设计、每条超越函数指令的控制过程及状态转换、使用比较频繁的宏操作的控制过程和浮点异常的检测过程。