[speex-dev] SIMD interest

[Aron Rosenberg]

No,

         The way you check if SSE FP / xmm is supported is to issue an 
instruction with an xmm operand inside of a try catch loop:

try
{
   issue asm which uses xmm registers such as:
         pxor xmm0 xmm1
}
catch(...)
{
   if you get here an illegal instruction exception occurred then xmm 
registers are not supported.
}

Incidentally, in our case, just having an Atholon XP with Windows XP does 
not mean support for xmm / SSE FP. Your BIOS needs to support it as well. 
We have on machine in our test labs that is exactly this case. Atholon 
2400+ XP with Win XP and no support for xmm / SSE FP.

AMD has a great sample program for determining which CPU flags are 
supported. You can find it at:

http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_2364,00.html

Aron Rosenberg
SightSpeed Inc.

<p>At 08:36 PM 1/17/2004 +0100, you wrote:
>Greetings,
>
>
>my apologies for putting this trash in the mailing list but the topic 
>about SSE run-time option interested me pretty much.
>Looks like some people is really experienced on the topic. I would really 
>appreciate if somebody could point me to good resources about SSE and 
>Altivec (not necessarly on the net, I'm ready to invest some money if 
>necessary). I already have intel manuals about SSE and I took a look at 
>Intel's document proposed by Ian.
>
>I was somewhat shocked by reading a mail posted by Jan-Marc (Date: 14 Jan 
>2004 02:44:59 -0500). I guess I badly misunderstood it by jumping to wrong 
>conclusions but does this means the only way to recognize if (say) SSE is 
>supported by OS is to check its version?
>This looks something problematic to me especially for open-source OSs 
>where one can recompile the kernel as he wants - kernel version number may 
>not really be representative of the functionalities supported.
>
>
>Thank you,
>Massimo

<p>--- >8 ----
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