BIS
#define BIS(i, w) (MWORD(w, i) |= MBIT(i))
#define BIS(i, w) (MWORD((w), (i)) |= MBIT(i))
#define BIS(w, b) (((w) & (b)) ? B_TRUE : B_FALSE)
#define BIS(w, b) (((w) & (b)) ? B_TRUE : B_FALSE)
#define BIS(w, b) (((w) & (b)) ? B_TRUE : B_FALSE)