有什么区别
ldw r8,0(r4)
and
mov r8, r4
Load word 说“从内存复制”，但是当 load word 从 r4 复制时，它是从寄存器复制而不是从内存复制，对吧？
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以及存储在的单词1234记忆中是5678.
区别在于：
move r8, r4 ; r8 is now 1234
lw r8, 0(r4) ; r8 is now 5678
1 The move instruction" is actually a pseudo-instruction where move $rt, $rs is encoded as addi $rt, $rs, 0.
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