arith3_name = {"SUBFC": 0b0000001000, "ADDC": 0b0000001010,
               "MULHWU": 0b0000001011, "SUBF": 0b0000101000,
               "MULHW": 0b0001001011, "SUBFE": 0b0010001000,
               "ADDE": 0b0010001010, "MULLW": 0b0011101011,
               "ADD": 0b0100001010, "DIVWU": 0b0111001011,