Barcelona optimization guide

By: hobold (hobold.delete@this.informatik.uni-bremen.de), May 14, 2007 4:30 am
Room: Moderated Discussions
anonymous (no@spam.com) on 5/12/07 wrote:
---------------------------

>Considering that people have been "trained" to align SSE
>data, I wonder how critical misaligned SSE support really
>is. In other words: is it a side effect of K8L's widened
>load ports, or did lots of folks demand it? (I also noted
>that the K8L optimization guide still claims that aligned
>SSE data is faster than unaligned one.)
>
Support for misaligned SIMD memory accesses is not critical in the sense that it improves performance across the board. But it is critical in the sense that usually, when you cannot optimize away misaligned accesses, they immediately become a performance bottleneck.

This is particularly an issue when you want to offer SIMD performance transparently, behind some scalar (and perhaps long existing) APIs.
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