设指令由取指、分析、执行3个子部件完成，并且每个子部件的时间均为Δt。若采用常规标量单流水线处理机（即该处理机的度为1），连续执行12条指令，共需 （请作答此空） Δt。若采用度为4的超标量流水线处理机，连续执行上述12条指令，只需 （ ） Δt。
- A.12
- B.14
- C.16
- D.18
正确答案及解析
正确答案
解析
指令由取指、分析和执行3个子部件完成，n=3，且每个子部件的时间均为Δt。若采用常规标量单流水线处理机（即该处理机的度m=1），连续执行12条（k=12）指令的时空图如图所示。执行这12条指令所需的总时间为：Tk=（k+3-1）*Δt=（12+3）*Δt=14Δt。
若采用度为4（m=4）的超标量流水线处理机，连续执行上述12条（k=12）指令的时空图如图所示。
由图可知，执行这12条指令所需的总时间只需要5Δt。
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