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isub $s0 $m0v $r0v # 0 - x isub $m0v $s0 $omr1 # x - 0 ipassa $m0v $r4v/$imr1 # x isub $r0v $s0 $omr1 # -x - 0 ipassa $r0v $s4v/$imr1 # -x nop iadd $r4v $s4v $n0v # x or -x