问题 问答题 简答题

评述解决数据相关的技术在DLX流水线的应用。

答案

参考答案:

在DLX中,由于ALU和数据存储器都要接受操作数,设置从寄存器文件EX/MEM和MEM/WB到这两个单元输入的定向路径,还有DLX的零监测单元在EX周期完成分支条件检测操作,也设置到该单元的定向路径,减少了数据相关带来的暂停;但并不是所有数据相关带来的暂停都可通过定向技术来消除,采用暂停技术,设置一个“流水线互锁”的功能部件,一旦流水线互锁检测到数据相关,流水线暂停执行发生数据相关指令后续的所有指令,直到该数据相关解决为止。利用编译器技术,重新组织代码顺序也可消除数据相关带来的必然暂停。

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