C5
#define C5(K, i) ROTATE(Cx.q[K.c[(i) * 8 + 5]], 40)
#define C5(K, i) (Cx.q[5 + 8 * K.c[(i) * 8 + 5]])
#define C5(K, i) (((u64_a1 *)(Cx.c + 3))[2 * K.c[(i) * 8 + 5]])
#define C5 80 /* Used for label positioning. */