汇编：ADD

 

The add instruction, like it’s x86 counterpart, adds two values on the 80x86. This instruction takes several forms. There are five forms that concern us here. They are：

add reg, reg
add reg, memory
add memory, reg
add reg, constant
add memory, constant

All these instructions add the second operand to the first leaving the sum in the first operand. For example, add bx,5 computes bx := bx + 5.