On Tue, Jun 16, 2009 at 1:41 PM, Stephen Frost<sfr...@snowman.net> wrote: > > Ah, you may be half right there (see below). It does appear to be > assuming that char *s (or s[i == 0]) is aligned, which isn't a > guarentee (in fact, it might never be right..). If having it actually > aligned is an important bit (as opposed to just doing the comparisons in > larger but possibly unaligned blocks) then that'd make a difference.
On some architectures like intel accessing unaligned ints is just slow. On others (Alpha and PPC iirc?) it is an immediate bus error. I would actually be more curious whether we can do th e comparison without having to pre-scan for the spaces at the end than trying to opimize that prescan. -- greg http://mit.edu/~gsstark/resume.pdf -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
