This means that,following the load instruction, our machinelanguage orogram would have to load the stack pointer into a trgister, subtract one from it,and store the result back in memory.(P349.

• 这就意味着，按照已存命令我们机器语言程序把一个栈指针存入寄存器，并将其值减一再将其结果放回内存中。