Annotated i965_prepare_composite ready for optimization

[Carl Worth]

On Tue, 26 Jun 2007 10:54:40 -0700, Carl Worth wrote:
> I'll put some charts showing the improvement up on my blog at

Here are the results:

	http://cworth.org/exa/i965/avoiding_rmw/

Note that some of the mozilla Trender benchmarks improved by over 2x
with this simple change. (And one did slow down, but I think we'll be
able to improve that easily enough, before too long.)

> Would someone like to review this series and push it or just give me
> the go ahead to push it?

Keith said I should go ahead and push it, so I've done that now.

-Carl
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