S_BYTECNT
#define V_BYTECNT(x) ((x) << S_BYTECNT)
#define G_BYTECNT(x) (((x) >> S_BYTECNT) & M_BYTECNT)
#define V_BYTECNT(x) ((x) << S_BYTECNT)
#define G_BYTECNT(x) (((x) >> S_BYTECNT) & M_BYTECNT)