Heikki Linnakangas <heikki.linnakan...@enterprisedb.com> writes: > On 28.08.2012 20:30, Tom Lane wrote: >> Fascinating. I'd been of the opinion that modern compilers would inline >> memset() for themselves and MemSet was probably not better than what the >> compiler could do these days. What platform are you testing on?
> x64, gcc 4.7.1, running Debian. > The assembly generated for the MemSet is: > [ pretty darn tight ] > while the corresponding memset code is: > [ not so good ] Seems like that's down to the CPU not doing "rep stosq" particularly quickly, which might well be chip-specific. Anyway, IIRC there are similar memsets for all the SPGiST opclass invocation calls, so I guess you should switch them all not just these two. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers