Conditional: if-else
if-else
if ( i == j ) $s1 i      
  i++ ; $s2 j      
else
  j-- ;
j += i ;
As before, if the condition is false, we want to jump.
      bne  $s1, $s2, ELSE   # branch if !( i == j )
      addi $s1, $s1, 1      #    i++
ELSE: addi $s2, $s2, -1     # else j--
      add $s2, $s2, $s1     # j += i
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