Re: [AD] [ alleg-Bugs-1650580 ] Problem in fixed point library.

[Thomas F. <tfj...@st...>]

On Monday 05 February 2007 7:43 am, Elias Pschernig wrote:
> On Tue, 2007-02-06 at 00:42 +1100, Peter Wang wrote:
> > I retried the benchmark in that thread, and fixdivl now beats fixdivf on
> > my machine by ~10%, where as it was slower by ~15% one and a half years
> > ago.  With a couple of other silly benchmarks fixdivl wins by an even
> > greater margin.  Probably the only relevant difference to my setup since
> > then would be a newer version of gcc (3.4.6 vs 3.3.4).
> >
> > Anyone up for some benchmarking?
>
> Results here are:
> with -O3 -march=pentium4: fixdivf is ~60% faster
> with -O3 -ffast-math: fixdivf is ~10% faster
> with -O3: fixdivf is ~10% faster
> with -O2: fixdivf is ~10% faster
> with -O1: fixdivf is ~10% faster
> with -O0: fixdivl is ~250% faster (irrelevant of course)

I'd like to see -Os as well. :)

> --
> Elias Pschernig
>
>
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-- 
Thomas Fjellstrom
tfj...@st...