This will always be the number of bytes it needs to shift left to move the address specified to the beginning of the register.

这将总会是它为了将指定地址移到寄存器的开始所需向左移位的字节数。

youdao

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.

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。

youdao