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.
