C3
# define C3(K,i) ROTATE(Cx.q[K.c[(i)*8+3]],24)
# define C3(K,i) (Cx.q[3+8*K.c[(i)*8+3]])
# define C3(K,i) (((u64*)(Cx.c+5))[2*K.c[(i)*8+3]])
#define C3 40 /* 40-59 */