C2
# define C2(K,i) ROTATE(Cx.q[K.c[(i)*8+2]],16)
# define C2(K,i) (Cx.q[2+8*K.c[(i)*8+2]])
# define C2(K,i) (((u64*)(Cx.c+6))[2*K.c[(i)*8+2]])
#define C2 gettynums[15].value
#define C2 C0 C0 C0 C0
#define C2 20 /* 20-39 */