负载字和移动之间的区别？ [英] Difference between load word and move?

问题描述

是什么

LDW r8,0（R4）

和

MOV R8，R4

？负载话说回来，但是当从R4负载workd拷贝是从寄存器复制和不正确的内存从内存中拷贝？

? Load word says it "copies from memory" but when load workd copies from r4 it is copying from register and not memory right?

推荐答案

的 LW 指令（我假定这就是你的意思，因为 LDW 不是一个标准的MIPS指令，但所有的负荷将是这个答案的情况下类似）加载从的内存地址的字的由 0指定+ R4 ，而移动 ¹ 只需把值 R4 到 R8 。

The lw instruction (I assume that's what you meant since ldw isn't a standard MIPS instruction, though all the loads will be similar in the context of this answer) loads a word from the memory address specified by 0 + r4, while move¹ simply transfers the value of r4 into r8.

例如，假设 R4 目前 1234 并保存在字1234 在内存 5678 。

For example, let's say r4 is currently 1234 and the word stored at 1234 in memory is 5678.

的差别是这样的：

move r8, r4            ; r8 is now 1234
lw   r8, 0(r4)         ; r8 is now 5678

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¹ 的移动指令其实是一个伪指令，其中动$ RT，$ RS 为en codeD为阿迪$ RT，$ RS，0 。

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¹ The move instruction" is actually a pseudo-instruction where move $rt, $rs is encoded as addi $rt, $rs, 0.

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