这两个除法都会避免调用除法函数，另外，无符号的除法要比有符号的除法使用更少的指令。
Both divisions will avoid calling the division function and the unsigned division will take fewer instructions than the signed division.
这些指令的特点是我们必须定义alu操作数和ALE(地址锁存允许)运算，除了两个例外：乘法和除法。
Main characteristic of these instructions is that we have to define both ALU operands and ALE operation. Exceptions among these instructions are mul (multiply) instruction div (divide) instruction.
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