On Fri, Jan 20, 2006 at 04:19:15PM -0500, Tom Lane wrote: > % cumulative self self total > time seconds seconds calls Ks/call Ks/call name > 98.96 1495.93 1495.93 33035195 0.00 0.00 hemdistsign
<snip> > So we gotta fix hemdistsign ... lol! Yeah, I guess so. Pretty nasty loop. LOOPBIT will iterate 8*63=504 times and it's going to do silly bit handling on each and every iteration. Given that all it's doing is counting bits, a simple fix would be to loop over bytes, use XOR and count ones. For extreme speedup create a lookup table with 256 entries to give you the answer straight away... Have a nice day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a > tool for doing 5% of the work and then sitting around waiting for someone > else to do the other 95% so you can sue them.
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