源操作数和目的操作数的顺序。
在所有指令中,先是源操作数,然后才是目的操作数。
In any instruction, source comes first and destination follows.
如果源操作数和目标操作数相对应的位都是0,那么OR指令结果的每一个位都设置为0;
Each bit of the result of the OR instruction is set to 0 if both corresponding bits of the first and second operands are 0; otherwise, each bit is set to 1.
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