| 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: Elias Pschernig <elias@xxxxxxxxxx>
- Date: Mon, 05 Feb 2007 15:43:54 +0100
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)
--
Elias Pschernig