嵌入式处理器流水线技术中的结构冒险是指()。
- A.因无法提供执行所需数据而导致指令不能在预定的时钟周期内执行的情况
- B.因取到指令不是所需要的而导致指令不能在预定的时钟周期内执行的情况
- C.因缺乏硬件支持而导致指令不能在预定的时钟周期内执行的情况
- D.因硬件出错而导致指令不能在预定的时钟周期内执行的情况
正确答案及解析
正确答案
解析
本题考查嵌入式处理器流水线技术的基础知识。 本题正确答案就是D,请仔细看解析。由于各种原因导致指令流水线执行书时阻塞并延期,一般分为三种冒险:数据冒险:指一条指令需要使用之前指令的计算结果,但是之前结果还没有返回产生的冲突现象。结构冒险:同一个指令周期内,不同功能争抢同一个硬件部分,即因硬件资源满足不了指令重叠执行的要求而发生的冲突现象。控制冒险:指流水线遇到分支指令或者其他可能引起PC指针进行改变的指令所引起的冲突现象。结构冒险的本质不是因为硬件不支持流水线,而是因为在同一个周期内,被多个功能同时争抢,会导致硬件出错。
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