[Mesa-dev] [PATCH] i965/vs: Add a comment about writemasking on scratch writes.

[Eric Anholt]

Kenneth Graunke <kenneth at whitecape.org> writes:

> The OWord Dual Block Write message doesn't have a response length, so it
> was surprising to a non-null destination register in the disassembly.
> Not only that, but seeing g0 was especially confusing, as writing to g0
> would destroy critical payload information that's needed for most SEND
> messages.
>
> I figured it would be worth adding a comment indicating the destination
> register doesn't matter, but the writemask does (and is why we don't use
> the null register.)

Wait, is specifying masks/predication on NULL illegal?  I wonder.
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