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    <p>for example:</p> <pre><code>beq $s0,$t0,ADDTN ADDTN: # code for addition # ... # some syscalls beq $s0.$t1,SUBTN SUBTN: . . . </code></pre> <p>I have no idea what the syscalls do (I usually don't code for MIPS).</p> <p>But you check for a condition, i. e. equality of $s0 and one of $tn, and on equality you jump to the routine that suits the case. Very well, but the routine is immediately following the <code>BEQ</code> instruction, so the branch is absolutely superfluous here. And further, if the condition is <em>not</em> met, the program continues with the code directly following the <code>BEQ</code> instruction.</p> <p>The result is that the routines (add least ADDTN) are unconditionally executed. As said, I do not know what the syscalls do, but if addition works, I guess they are kinda jumps or so.</p> <p>Anyway, you must rearrange your code so that depending on the state of the tested condition another branch of your code is executed. This is a generic "template":</p> <pre><code> beq $s0, $t0, equal # this code is executed if $s0 and $t0 differ . . jmp notequal # avoid also executing the code for equal equal: # code for the case $s0 and $t0 hold the same value . . notequal: # all that follows executes with no regard of the checked condition </code></pre> <p>There are other techniques for branching several cases like yours (you seem to have to check four operations, I guess), but you should start understanding the basics first.</p> <p>[update: Well, actually it's not that different, just that the code blocks are spread wider... /update]</p> <p>Have fun...</p>
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