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