[sldev] SSE/Vector stuff

[Nicholaz Beresford]

Dirk,
Dzon,

thanks for the info.  I'll probably opt for a
source change in those to files, because it is
easier to patch them again for later releases,
but now at least I know what I have to look for.

Is this change intended long term for something
else?  I mean, most people are probably running
with VBO's right?


Nick


Second Life from the inside out:
http://nicholaz-beresford.blogspot.com/


Dzonatas wrote:
> Probably easier just to define _M_IX86_FP in the VS2003 project files 
> and only for the llviewerjointmesh_sse.cpp and 
> llviewerjointmesh_sse2.cpp files. That would avoid any extra changes to 
> the source  and remain easily portable.
> 
> Dirk Moerenhout wrote:
>> In llv4math.h remove the "&& _M_IX86_FP"
>> Make sure you have SSE enabled for llviewerjointmesh_sse.cpp and SSE2
>> for llviewerjointmesh_sse2.cpp. Compile and then run with the vertex
>> shaders turned off. In your log files you'll see the result of the
>> benchmarks. It switches between normal and SSE and makes 10
>> comparisons. After that it'll record the best one as default.
>>
>> If you'd turn vertex shaders off without removing the dependency on
>> the _M_IX86_FP macro you should see that it doesn't find a real
>> benefit in using SSE.
>>
>> Dirk aka Blakar Ogre
>>
>> On 7/8/07, Nicholaz Beresford <nicholaz at blueflash.cc> wrote:
>>>
>>> Dirk Moerenhout wrote:
>>> > Missing that _M_IX86_FP doesn't exist for VS2003 would happen to most
>>> > of us. I just got lucky that I spotted it while browsing the info.
>>> >
>>> > I turned of my vertex shaders and let the program do a full run of
>>> > tests. The SSE2 code was notably faster and got picked correctly.
>>> > Seems to work fine when compiled with VS2005.
>>> >
>>> > For VS2003 you'll just have to assume people compile with correct arch
>>> > cause I don't see a good way to detect arch during the compile. In the
>>> > end if they don't set the correct arch it simply will not compile at
>>> > all in such a case as it'll error out on the intrinsics.
>>>
>>> Well, I have VS2003.  If anyone tells me what exactly I need to do and
>>> where to look, I'll try and see what results it will have.
>>>
>>>
>>> Nick
>>>
>>>
>>> Second Life from the inside out:
>>> http://nicholaz-beresford.blogspot.com/
>>>
>>>
>>>
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