将一条指令的执行过程分解为取指、分析和执行三步，按照流水方式执行，若取指时间t取指=4?t、分析时间t分析=2?t、执行时间t执行=3?t，则执行完100条指令，需要的时间为（）?t。
- A.200
- B.300
- C.400
- D.405
正确答案及解析
正确答案
解析
对于该指令流水线，建立时间为4t+2t+3t=9t，此后每4t执行完一条指令，即执行完100条指令的时间为9t+99*4t=405t。
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