将表达式的位左移，然后将结果赋给第一个参数。

Shifts the bits of an expression to the left, and assigns the result to the first argument.

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我们可以在序列化之前模糊化该数据，将数位循环左移一位，然后在反序列化之后复位。

We can obscure this data by rotating the bits once to the left before serialization, and then rotate them back after deserialization.

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因此，只需将内容向左移位四个字节到新的寄存器来获得在首选槽内的低阶位。

Therefore, you just shift the contents to the left by four bytes into a new register to get the low-order bits in the preferred slot.

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