C4
#define C4(K, i) ROTATE(Cx.q[K.c[(i) * 8 + 4]], 32)
#define C4(K, i) (Cx.q[4 + 8 * K.c[(i) * 8 + 4]])
#define C4(K, i) (((u64_a1 *)(Cx.c + 4))[2 * K.c[(i) * 8 + 4]])
#define C4 C4u.e
#define C4 60 /* 60-80 */