Re: Performance improvements for src/port/snprintf.c

Andres Freund <andres(at)anarazel(dot)de> writes:
> So when using pg's snprintf() to print a single floating point number
> with precision, we get nearly a 10% boost.

I just tested that using my little standalone testbed, and I failed
to replicate the result. I do see that strfromd is slightly faster,
but it's just a few percent measuring snprintf.c in isolation --- in
the overall context of COPY, I don't see how you get to 10% net savings.

So I continue to think there's something fishy about your test case.

BTW, so far as I can tell on F28, strfromd isn't exposed without
"-D__STDC_WANT_IEC_60559_BFP_EXT__", which seems fairly scary;
what else does that affect?

regards, tom lane