At 7:15 AM -0700 3/23/2011, imrazor wrote:
> Ok, I'll ask - I am well aware of how AltiVec functioned. And no
argument that an Intel-written SW may not properly run on a PPC to
take advantage. Honest question though - Doesn't Intel have a similar
functioning SIMD unit? Also 128bit wide? If that's the case, I'd
expect that a 4x2.8GHz machine to be 4.48X as fast as a 2x1.25GHz
machine, given the similarity between both SIMD units. The near 10X
improvement I see proves your point, to me, at least, that the code
was not optimized for PPC, specifically AltiVec. I have the latest DVD
rip I'm sending to a TiVo, will run on both machines to confirm exact
ratio I see.
You're right - Intel does have a competing technology called SSE. You
can read more about it here, though don't ask me to translate into
English:
http://en.wikipedia.org/wiki/Streaming_SIMD_Extensions
I've never seen a performance comparison between Altivec and SSE,
though it would make an interesting read.
This is good too:
<http://developer.apple.com/hardwaredrivers/ve/summary.html>
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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