循环左移功能块（ROL）用于将位串所有的位向左循环一定数目的位数。循环开始时，所的位数从左端循环移出，再从右端循环移入。 循环右移功能块（ROR）用于将位串所有的位向右循环一定数目的位数。循 环开始时，所的位数从右端循环移出，再从左端循环移入
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