On 03/06/13 15:16, David Malone wrote: >> + /* >> + * 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.
Given that there's no such thing as GF(216) due to 216 = 2^3 * 3^3 not being a prime power, the comment is definitely wrong. ;-) -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
