Converting C to MIPS?

This is a discussion on Converting C to MIPS? within the C Programming forums, part of the General Programming Boards category; Hi, I've just started looking at MIPS assembly and one of the questions in my book asks to convert C ...

  1. #1
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    Converting C to MIPS?

    Hi,

    I've just started looking at MIPS assembly and one of the questions in my book asks to convert C to MIPS:

    Code:
    for (i = 1; i <= 25; i += 2) {
             A[i] = A[i-1] - B[i-1];
    }
    Where A and B are both arrays of integers, an addressed at $s2 and $s4 respectively.

    I'm not sure how to approach this as I've never really coded in C and very new to MIPS. Would I store i to a temporary register like say $t0? Also would I need to rewrite this as a while loop for MIPS? I'm not really sure how to write it as a For loop in MIPS. I would use a "Break" if it were an if/then loop, but like I said I'm not sure how to handle the for loop.

    Any info or starting tips would be greatly appreciated.

  2. #2
    Woof, woof! zacs7's Avatar
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    Yes, you'll need to store 'i' in some temporary register. As you said $t0 is a good place.

    Just keep looping, but branch when 'i' ($t0) is greater than 25. Your loop may look something like:
    Code:
    addi $t0, $0, 1 
    addi $t1, $0, 25
    
    loop:
       # i <= 25
       bgt $t0, $t1, end
    
       # ... stuff in the loop
    
       # i += 2
       addi $t0, $t0, 2
    
       # go to the next iteration
       j loop
    
    end:
       # ... stuff after the loop ...
    Don't get caught up in the while/do-while/for loops, they all can be written as for loops, while loops or do-while loops.
    Last edited by zacs7; 03-25-2010 at 05:53 PM.

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