| Re: [AD] [ alleg-Bugs-1650580 ] Problem in fixed point library. |
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- To: Coordination of admins/developers of the game programming library Allegro <alleg-developers@xxxxxxxxxx>
- Subject: Re: [AD] [ alleg-Bugs-1650580 ] Problem in fixed point library.
- From: Thomas Fjellstrom <tfjellstrom@xxxxxxxxxx>
- Date: Mon, 5 Feb 2007 07:45:49 -0700
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
tfjellstrom@xxxxxxxxxx