转换从Java到MIPS [英] Convert from Java to MIPS

问题描述

我有一个天一次考试，我真的AP preciate，如果你们可以检查我的答案。我有一小片的Java code的转换成MIPS指令，但没有备忘录可用，这是第一次我在做这样的事情。

I have an exam in a days time, and I would really appreciate it if you guys can check an answer of mine. I have to convert a small piece of java code into a MIPS instruction, but no memos are available, and this is the first time I'm doing this sort of thing.

下面是问题：

While (save[i] != k) { 
save[i] = v[i]; 
i=i+2; 
} 

a）项所列的code是分配的每个第二个元素较高水平的Java程序
阵列v到数组保存。假设汇编存储的基地址
数组保存和V分别到寄存器$ S2和S3 $，你被要求转换
上述成汇编语言code Java程序。
注意：您可以自由使用不同的寄存器用于那些没有指定的变量
明确

a) The code listed above is a high level Java program that assigns each second element of array v to the array save. Assuming that the assembler stores the base addresses of the arrays save and v respectively into registers $s2 and $s3, you are asked to convert the Java program above into an assembly language code. Note: You are free to use different registers for the variables which were not specified explicitly

和这里是一个尝试：

我= $ T1

K = $ T2

loop:
    sll  $t3, $t1, 2     //get the offset (i*4)
    add  $t4, $t3, $s2   //t4 is the address for save[i]
    beq  $t4, $t2, exit  //check the while condition
    add  $t5, $t3, $s3   //t5 is the address for v[i]
    sw   $t4, $t5        //save[i] = v[i]
    addi $t1, 2          //inc i
    j    loop
exit:

任何帮助将大大AP preciated。

Any help would be greatly appreciated.

编辑：改变'BNE'到'BEQ

changed 'bne' to 'beq'

推荐答案

您错过了几个负载，和你的店是不正确的：

You're missing a couple of loads, and your store is incorrect:

sll  $t3, $t1, 2     //get the offset (i*4)
add  $t4, $t3, $s2   //t4 is the address for save[i]
lw   $t5,($t4)       //t5 = save[i]
beq  $t5, $t2, exit  //check the while condition
add  $t5, $t3, $s3   //t5 is the address for v[i]
lw   $t5,($t5)       //t5 = v[i]
sw   $t5, ($t4)      //save[i] = v[i]
addi $t1, 2          //inc i

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