BITS
#define BITS(word, s, e) (((word) >> (s)) & (~((-2) << ((e) - (s)))))
#define BITS(_start, _end) ((BIT(_end) - BIT(_start)) + BIT(_end))
#define BITS(nb) (BIT(nb) - 1)
#define BITS(fds, n) (*FDS_IN(fds, n)|*FDS_OUT(fds, n)|*FDS_EX(fds, n))
BITS = 0x3C,
#define BITS(n) \
#define BITS (1<<SHIFT)
#define BITS 16