MOV 和 LEA 有什么区别?

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问题描述

我想知道这些说明有什么区别:

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 表示加载值

LEA means Load Effective Address
MOV means Load Value

简而言之，LEA 加载指向您正在寻址的项目的指针，而 MOV 加载该地址的实际值.

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

LEA 的目的是允许一个人执行非平凡的地址计算并存储结果[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

在只涉及常量的情况下，MOV(通过汇编程序的常量计算)有时会与 LEA 的最简单用法重叠.如果您有多个基地址等的多部分计算，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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