MIPS五级流水线模拟程序

代码说明：

  MIPS五级流水线模拟程序，能执行简单的MIPS指令，模拟流水线状态及寄存器结果，实现cpu流水的概念(MIPS five-level stream-line simulation program, this program can execute simple MIPS instruction, simulat stream-line s status and register result, and it implements stream-line of cpu.)