BSF - Bit Scan Forward (386+) BSR - Bit Scan Reverse (386+)
BTR - Bit Test with Reset (386+) BTS - Bit Test and Set (386+)
其中这两个指令的Bit Test的结果放入CF中。想将CF中的结果弄出来一般用
SETB - Set if Below SBB - Subtract with Borrow/Carry
