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copied!<p>Here you go, a simple version that translates your C code into MIPS:</p> <p>Note: I am using SPIM for this.</p> <pre><code>main: li $t0, 2 # $t0 = x = 2 li $t1, 0 # $t1 = index = 0 li $t2, 4 # $t2 = indexLimit = 4 jal forLoop # jump and link the forLoop label move $a0, $t0 # move the result into $a0 for printing li $v0, 1 # load print integer code syscall # tell system to do it li $v0, 10 # load exit code syscall # clean exit forLoop: bge $t1, $t2, exit # if index >= 4 goto exit label add $t0, $t0, $t1 # x = x + index addi $t1, $t1, 1 # index++ j forLoop # continue loop by jumping back up exit: jr $ra # jump and return the return address </code></pre> <p>To answer your question: <code>nop</code> does nothing at all. You can use it for timing purposes etc. Here is a Wikipedia link for further reading <a href="http://en.wikipedia.org/wiki/NOP" rel="nofollow">http://en.wikipedia.org/wiki/NOP</a>. Note to end a MIPS program load 10 into $v0 and then syscall.</p> <p>EDIT:</p> <p>In response to your comment: you are on the right track but don't forget to add a main label, then jump from the main label to the forLoop and then have your Exit label terminate the program (print the integer first if so desired).</p> <p>These are two useful links for programming in MIPS: <a href="http://www.mrc.uidaho.edu/mrc/people/jff/digital/MIPSir.html" rel="nofollow">http://www.mrc.uidaho.edu/mrc/people/jff/digital/MIPSir.html</a> <a href="http://logos.cs.uic.edu/366/notes/mips%20quick%20tutorial.htm" rel="nofollow">http://logos.cs.uic.edu/366/notes/mips%20quick%20tutorial.htm</a></p>

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