使用MIPS程序集进行整数数组索引 [英] Integer array indexing with MIPS assembly

问题描述

我想将此C代码转换为MIPS.

I wanted to convert this C code into MIPS.

C代码:

f = A[B[h-g]]

我们假设h > g和B[h-g] > 0. h，g，f是整数.

We assume that h > g and B[h-g] > 0. h, g, f are integers.

还假定已将f分配给寄存器$s0，g至$s1，h至$s2.

Also assume that f is assigned to register $s0, g to $s1, h to $s2.

A-> $s6和B-> $s7

这是我的尝试:

sub $t0, $s2, $s1                   
mult $t0, $t0, 4                     
lw $t0, $t0($s7)           
mult $t0, $t0, 4           
sw $s0, $t0($s6)

推荐答案

除了最后一行，看起来不错，

It looks good, apart from the last line, which should most likely be:

lw $s0, $t0($s6)

请注意，您应该始终对代码进行注释，尤其是当其为asm时，例如

Note that you should always comment your code, particularly so when it's asm, e.g.

sub $t0, $s2, $s1         ; t0 = h - g          
mult $t0, $t0, 4          ; t0 = (h - g) * sizeof(int) = byte index into B
lw $t0, $t0($s7)          ; t0 = B[h - g]
mult $t0, $t0, 4          ; t0 = B[h - g] * sizeof(int) = byte index into A
lw $s0, $t0($s6)          ; s0 = A[B[h - g]]

还请注意，您应该始终测试您的代码-我建议您使用模拟器，例如

Note also that you should always test your code - I would recommend using a simulator such as SPIM for this.

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