MOV和LEA有什么区别? [英] What is the difference between MOV and LEA?

问题描述

我想知道这些指令之间的区别是什么

I would like to know what the difference between these instructions is:

MOV AX, [TABLE-ADDR]

和

LEA AX, [TABLE-ADDR]

推荐答案

• LEA表示加载有效地址
• MOV表示负载值
• LEA means Load Effective Address
• MOV means Load Value

简而言之，LEA加载指向您要寻址的项目的指针，而MOV加载该地址处的实际值.

In short, LEA loads a pointer to the item you're addressing whereas MOV loads the actual value at that address.

LEA的目的是允许用户执行非平凡的地址计算并存储结果[以供以后使用]

The purpose of LEA is to allow one to perform a non-trivial address calculation and store the result [for later usage]

LEA ax, [BP+SI+5] ; Compute address of value

MOV ax, [BP+SI+5] ; Load value at that address

仅涉及常量的地方，MOV(通过汇编程序的常量计算)有时似乎与LEA的最简单用法重叠.如果您要进行包含多个基地址等的多部分计算，那么它很有用.

Where there are just constants involved, MOV (through the assembler's constant calculations) can sometimes appear to overlap with the simplest cases of usage of LEA. Its useful if you have a multi-part calculation with multiple base addresses etc.

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