默认指定的子句可以为一个常量、一个特殊的寄存器、另一个全局变量、一个表达式或关键字NULL。
The default clause specified can be either a constant, a special register, another global variable, an expression or the keyword NULL.
它将第二个操作数内的寄存器与第三个操作数内的常量加在一起，并将结果存储在第一个操作数内指定的寄存器中。
It adds together the register in the second operand with the constant in the third operand, and stores the result in the register specified in the first operand.
在寄存器加上一个常量是为了计算用于加载或存储的地址。
The constant gets added to the register to compute the address to use for loading or storing.
默认指定的子句可以为一个常量、一个特殊的寄存器、另一个全局变量、一个表达式或关键字NULL。
The default clause specified can be either a constant, a special register, another global variable, an expression or the keyword NULL.
其他常见的格式还有 X-Form（接受两个加在一起的寄存器）和A-Form（可保存一个常量或一个常量相对偏移量地址）。
The other popular formats are the X-Form, which takes two registers which are added together, or the A-Form, which can hold a constant or a constant relative offset address.
其他常见的格式还有 X-Form（接受两个加在一起的寄存器）和A-Form（可保存一个常量或一个常量相对偏移量地址）。
The other popular formats are the X-Form, which takes two registers which are added together, or the A-Form, which can hold a constant or a constant relative offset address.
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