 prefetch. Class 0 instructions don’t affect
the prefetch, class 1 ones affect one word of the prefetch, and class 2 ones
affect both words. To be precise, the class number reflects how many words on
the instruction stream can be modified before they are prefetched by the
current instruction.</p>

<p class=MsoNormal><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></p>

<p class=MsoNormal>So we’ll attempt below to describe the exact behavior for
all the instructions that write to memory. We