注意所有声明的变量（使用 DMA 复制的）都是按四字边界对齐的且都是四字的整数倍。

Note that all of the declared variables which will be copied using DMA are aligned on quadword boundaries and are multiples of quadwords.

youdao

记住，lqd指令只能从16字节边界加载，所以它会在加载期间忽略最低有效的四位，而只会从内存加载已对齐的四字。

Remember, the LQD instruction only loads from 16-byte boundaries. It will therefore ignore the four least significant bits during the load, and just load an aligned quadword from memory.

youdao

因为所有对象都是从8字节边界开始，并且大小可以被8整除，所以底部的3位不用于表示大小；我们将其作为标志，用于表示对象的不同状态。

As all objects start on an 8 byte boundary, and the size is divisible by 8, the bottom 3 bits are not used for the size; we use them for flags to indicate different states of the object.

youdao