BIT输入存储了下一个比较开始时的位编号。通常它和最后一一个不可比较的位编号相同。因为最后一个不可比较的位编号存储在输出BN中，所以相同的基准地址可以用在BIT和BN上。一个比较通常在BIT后的第—位开始:因此最初的BIT的值应该小于开始比较的位的编号(例如0,在%100001开始比较)。

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