Meanwhile, to further improve green indicators of the system, the iterative optimization on the first two optimization method is applied which makes the utilization of registers get more balanced and dynamic energy get lower. 4. 同时,为进一步提升系统的绿色指标,在前两种优化的基础上增加了迭代式优化,通过迭代优化使得寄存器使用更加均衡,相邻指令间的动态能耗更小。