crypto_core_ROUNDS
for (i = crypto_core_ROUNDS; i > 0; i -= 2) {
# if crypto_core_ROUNDS == 8
# elif crypto_core_ROUNDS == 12
# elif crypto_core_ROUNDS == 20
# if crypto_core_ROUNDS == 8
# elif crypto_core_ROUNDS == 12
# elif crypto_core_ROUNDS == 20
# if crypto_core_ROUNDS == 20
# if crypto_core_ROUNDS == 20
# if crypto_core_ROUNDS == 20
# if crypto_core_ROUNDS == 20