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Subject: Re: copy cost

Author: Christophe Theron

Date: 09:49:42 08/24/03

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On August 24, 2003 at 03:04:16, Gerd Isenberg wrote:

>On August 23, 2003 at 23:54:46, Christophe Theron wrote:
>
>>On August 23, 2003 at 15:44:37, Dieter Buerssner wrote:
>>
>>>On August 23, 2003 at 14:13:48, Christophe Theron wrote:
>>>
>>>>Talk about a useful advice!
>>>
>>>You mentioned in the past, that you use Gcc. Gcc can align jump targets for you
>>>automatically. Probably other compilers can do this as well. Of course it will
>>>depend on the compiler options (and the hardware) what works best.
>>>
>>>Regards,
>>>Dieter
>>
>>
>>
>>Every processor has its own set of good recipes. So I would have to release
>>several versions of my engine.
>>
>>I think time may be better invested in other things... :)
>
>Of course, but if opteron/athlon64 becomes the main chess platform,
>i guess you will ship a x86-64 version (windows64/linux64), a x86-32
>(windows,linux) as well a palm version.
>
>If you play a tournament with a concrete hardware, you may even try some
>compiler settings for best results on this target hardware :)



The honest answer here is definitely NO.

Over the years my experience is that you must never show up in a tournament with
a fresh version. Always compete with a version that has been tested for several
weeks at least.

Recompiling is for me the equivalent of creating a new version, even if nothing
has changed in the code. The newly created executable has not passed any tests,
so by default it must considered as broken.

So I would most certainly not create a special version for a tournament and
would instead compete with a version several weeks old, and preferably the last
release of the commercial version if it is not too old either, because a
released version has passed thousands of tests successfully and is the most
reliable thing I can produce.



    Christophe



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