[Mesa-dev] [PATCH] i965: Bump Ivybridge's fake MRF range to g112-127 instead of g111-126.

[Eric Anholt]

On Tue, 17 Jan 2012 19:43:52 -0800, Kenneth Graunke <kenneth at whitecape.org> wrote:
> When I originally implemented the hack to use GRFs 111+ as fake MRFs, I
> did so purely to avoid rewriting all the code that dealt with MRFs.
> However, it turns out that a similar hack is actually required.
> 
> Newly discovered language in the BSpec indicates that SEND instructions
> with EOT set "should" use g112-g127 as their source registers.  Based on
> assertions in the simulator, this is actually a requirement on certain
> platforms.
> 
> Since we're faking MRFs already, we may as well use the officially
> sanctioned range.  My guess is that we avoided this issue because we
> seldom use m0: URB writes in the new VS backend start at m1, and RT
> writes in the new FS backend start at m2.

Reviewed-by: Eric Anholt <eric at anholt.net>
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