异或功能用于快速比较两个位串，或用于实现使一组位以 每两个扫描周期一个 ON 状态的速率来闪烁。如果移位的位数 (N) 大于数组元素数 * 16, 那么数组 (Q) 用输入位(B1)填满, 且输入位还复制到输出位(B2)中。如果移位位数为 0，那么无移位过程；输入 数组赋值到输出数组，
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