> + /*
> + * We're just computing (a-b) in GF(216).
> + ndesc = (unsigned)*hq->hq_avail_idx - (unsigned)hq->hq_cur_aidx;
I think the comment here is wrong? Subtraction (and addition) in
GF(2^16) is just xor of 16 bit numbers. You seem to actually be
working in Z(2^16), where subtraction is normal subtraction mod
65536.
David.
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