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RE: Re: [Bug-gnubg] gnubg sse problems on non-sse cpu's

From: Øystein O. Johansen
Subject: RE: Re: [Bug-gnubg] gnubg sse problems on non-sse cpu's
Date: Mon, 10 Apr 2006 10:04:15 +0200

>>Yes, this is a SSE instruction.  Probably easiest to have a SSE
>> and a non-SSE build for the moment.  (conditionally using SSE has
>> the disadvantage of these optimisation not being included on SSE
>> machines).
> Hi Jon,
> just a question about the SSE detection code : does it work
> if I compile with -sse3 ? i.e. will the code compiled with
> -sse3 work on non-sse PCs ? and on -sse or -sse2 only PCs ?

The nueral net code does not use any sse2 or sse3 instructions,
so the evaluation code won't gain anything by using the -sse2 or
-sse3 switch. However, the compiler can find some places on it's
own where it uses sse3 or sse3 instructions with this flag set.
If that's the case, you will exclude some users.

I actually believe you should only compile the vital files with
-sse if you want a general build. (that neuralnet.c and eval.c)


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