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【简答题】
为了减少指令条数，典型的面向定点数的RISC计算机不设置“清除寄存器(置O)指令”和“寄存器之间的数据传送指令”，也不设置“将操作数(存放于寄存器中)取反”的指令。设RISC计算机的算术运算指令均为“采用寄存器寻址的三操作数指令”，格式为： OP R1，R2，R3。 它们的两个源操作数R1和R2必须来自不同的通用寄存器，运算结果(目的操作数)可以存入第3个通用寄存器R3，也可以存入与某个源操作数相同的通用寄存器。 请问： 这样的RISC计算机必须进行怎样特别的系统结构设计，用算术运算指令实现“清除寄存器Ri”和“将寄存器Ri的值送入寄存器Rj中”以及“将操作数(存放于寄存器Ri中)取反”。
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