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然后对于三级流水线举例如下:<br />
从上图,其实很容易看出,第一条指令:<br />
add r0, r1,$5<br />
执行的时候,此时PC已经指向第三条指令:<br />
cmp r2,#3<br />
的地址了,所以,是PC=PC+8.<br />
图表 24 ARM7 三级流水线状态<br />
图表 25 ARM7 三级流水线示例<br />
3.3.1. 为何 ARM9 和 ARM7 一样,也是 PC=PC+8<br />
ARM7的三条流水线,PC=PC+8,很好理解,但是AMR9中,是五级流水线,为何还是PC=PC+8,<br />
而不是<br />
PC<br />
=PC+(5-1)*4<br />
=PC + 16,<br />
呢?
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