08 00 49 40    bc 2,9,0x8
    spec       bc BO,BI,BD (AA=0 LK=0)
    opcode     0x40000000
    mask       0xfc000003
    BO         00010 [6, 7, 8, 9, 10]
    BI         01001 [11, 12, 13, 14, 15]
    BD         00000000000010{00} [16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29]
    AA         0 [30]
    LK         0 [31]