Annotated i965_prepare_composite ready for optimization

[Carl Worth]

As feedback to a recent blog post[*] I made showing
i965_prepare_composite to be a bottleneck in a Mozilla rendering
benchmark with an i965 and with EXA, I received a kind message cluing
me into opannotate, (thanks Roland!).

Here's a new entry explaining what I learned:

	http://www.cworth.org/exa/opannotate_i965_prepare_composite/

and here are the annotated source and assembly versions of the
functions of interest:

	http://www.cworth.org/exa/i965_prepare_composite.source_annotate

	http://www.cworth.org/exa/i965_prepare_composite.assembly_annotate

I'd greatly appreciate any ideas for improving the performance of this
function.

Thanks,

-Carl

[*] http://www.cworth.org/exa/mozilla_i965_profiles/
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