为什么RISC指令集通常不包含寄存器到寄存器复制指令? [英] Why the RISC instruction sets usually do not contain register to register copy instruction?

问题描述

我在考试中有这个问题，我很困惑，因为据我所知

I had this question on my exam and i am confused because as far as i know that

move $t0, $a0               # COPY $A0 TO $T0

MIPS指令中的

规定MIPS是RISC处理器.我想念什么吗?

in MIPS instruction provides that and MIPS is a RISC processor. Am I missing something?

推荐答案

移动是伪指令，当汇编时，它实际上是另一种指令.

Move is a pseudoinstruction, and when assembled will really be a different instruction.

例如

移动$ t0，$ zero被实现为addu $ t0，$ zero，$ zero

move $t0, $zero gets implemented as addu $t0, $zero, $zero

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