[sldev] SSE2 / Ouch

[Tateru Nino]

You could overload the class methods, but it still might not play well
in the preconstruction phase or destruction.
You can try abstracting it all through a pointer or a reference off into
'untainted' portions of the text segment.

Dirk Moerenhout wrote:
> I just thought of the fact that static there isn't the point. It's
> outside scope of a class so it's there to limit the var to the file. I
> should really polish up my C++ :-)
>
> It doesn't make things easier as I still don't see how a simple change
> can solve the issue. You need the correct arch to be enabled or the
> class will not be compiled with the correct code. What if you make
> descendant classes and overload the functions instead?
>
> I'm starting to remember why I'm not fond of OO :)
>
> Dirk aka Blakar Ogre
>
> On 7/9/07, Dirk Moerenhout <blakar at gmail.com> wrote:
>> Well I already noted in a previous mail I wasn't convinced that it
>> would be safe to do it this way as everything you include gets handled
>> with the same architecture. So you really need to go over all your
>> includes in there and look what exactly you are doing and what the
>> global impact will be.
>>
>> I guess the issue is that we have this:
>> static LLV4Matrix4      sJointMat[32];
>>
>> That initialisation will probably use SSE.
>>
>> You can't just move that elsewhere because then no SSE code would be
>> generated (as there's  #if LL_VECTORIZE in there).
>>
>> Tricky :) I suppose you can drop the static but it'll likely have
>> performance impact and I'm not sure it's enough to stop MSVC from
>> bleeding SSE instructions over to unexpected areas.
>>
>> Dirk aka Blakar Ogre
>>
>>
>> On 7/9/07, Nicholaz Beresford <nicholaz at blueflash.cc> wrote:
>> >
>> > Dunno if it's true, but if it is (and this guy sounds like
>> > he knows what he's talking about), it's a definite "OUCH!"
>> > and explains a lot of reports about crashing on startup.
>> >
>> > https://jira.secondlife.com/browse/VWR-1610
>> >
>> >
>> >
>> >
>> > Nick
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-- 
Tateru Nino
http://dwellonit.blogspot.com/