12 Jan
2006
12 Jan
'06
9:45 a.m.
On 1/12/06, Bill Schottstaedt <bil(a)ccrma.stanford.edu> wrote:
I ran some timing tests, partly to check out
-fast-math -- my informal impression
is that it speeds up exp by a factor of about 2, but can slow down other things
(FIR filters). I didn't see any obvious improvement in -O3 over -O2. The
actual numbers are in the snd tarball, snd-edits.c -- look for "fast-math".
(The table is aimed more at comparing int/float/double operations). These
timing numbers change by a factor of, say, 20% on each run, so don't put
much weight on them.
I read somewhere that -Os (optimize for "smaller" code, intended for
embedded systems maybe?) sometimes produces faster code than -O2 or
-O3. Has anybody tried that on their plugins or anything else?
Might not help at all if, as Steve Harris said, most plugin inner
loops fit in cache already.