如何做LEA和几个指导工作？ [英] how does LEA and several instruction work?

问题描述

我不完全了解的前两行的意义，和最后两行的差..

I dont fully understand the meaning of first two lines, and the difference of last two lines..

LDS SI,[BX]
LES DI,[BX]
LEA DI,5000h 
MOV DI,5000h

我觉得LEA负荷在DI 5000H的DI和MO​​V加载内容5000H。我说得对不对？

I think LEA loads 5000h in DI and MOV loads content of 5000h in DI. Am I right??

推荐答案

前两个负荷的32比特的内容指向 BX 到 DS 和 SI （或 ES 和迪）。

The first two load the contents of 32 bits pointed to by bx into ds and si (or es and di).

第二两个是相同的，因为该值是文字。但如果它们是：

The second two are the same because the values are literals. If, however they were:

lea di,[bx]
mov di,[bx]

那么你的预期是正确的：前者把地址 BX 到迪，后者把16位指向 BX 到迪。

then your expectation would be right: the former putting the address bx into di and the latter putting the 16 bits pointed to by bx into di.

有关双方的更多信息，请参见为这个问题莱 / LDS 和这个问题 MOV / LEA 了。

For more information on both, see this question for les/lds and this question for mov/lea.

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