17. Integer logic and arithmetic

• 
      # Instruction        # Meaning in pseudocode
      add $t1, $t2, $t3    # $t1 = $t2 + $t3
      sub $t1, $t2, $t3    # $t1 = $t2 - $t3
      and $t1, $t2, $t3    # $t1 = $t2 & $t3 (bitwise and)
      or  $t1, $t2, $t3    # $t1 = $t2 | $t3 (bitwise or)
  
      # set if equal:
      seq $t1, $t2, $t3    # $t1 = $t2 == $t3 ? 1 : 0
  
      # set if less than:
      slt $t1, $t2, $t3    # $t1 = $t2 < $t3 ? 1 : 0
  
      # set if less than or equal:
      sle $t1, $t2, $t3    # $t1 = $t2 <= $t3 ? 1 : 0
  
  

• Other instructions of the same form

  
      xor, nor
      sne, sgt, sge