SKEIN_256_ROUNDS_TOTAL
#define R256_Unroll_R(NN) ((SKEIN_UNROLL_256 == 0 && SKEIN_256_ROUNDS_TOTAL/8 > (NN)) || (SKEIN_UNROLL_256 > (NN)))
#define RCNT (SKEIN_256_ROUNDS_TOTAL/8)