C7
#define C7(K, i) ROTATE(Cx.q[K.c[(i) * 8 + 7]], 56)
#define C7(K, i) (Cx.q[7 + 8 * K.c[(i) * 8 + 7]])
#define C7(K, i) (((u64_a1 *)(Cx.c + 1))[2 * K.c[(i) * 8 + 7]])