[Mesa-dev] [PATCH 3/3] i965/fs: Add a MAX_GRF_SIZE define and use it various places

Kenneth Graunke kenneth at whitecape.org
Thu Oct 2 14:14:47 PDT 2014

On Thursday, October 02, 2014 11:53:27 AM Matt Turner wrote:
> On Wed, Oct 1, 2014 at 12:18 PM, Jason Ekstrand <jason at jlekstrand.net> wrote:
> > Previously, we had a MAX_SAMPLER_MESSAGE_SIZE which we used instead.
> > However, some FB write messages can validly be longer than this so we need
> > something different.  Since MAX_SAMPLER_MESSAGE_SIZE is validly useful on
> > its own, we leave it alone and add a new MAX_GRF_SIZE that's big enough for
> > FB writes.
> I might call it MAX_FB_WRITE_SIZE or something. MAX_GRF_SIZE is a
> little generic, but in the register allocation code it seems like the
> thing you want to convey is "this is the largest group of registers
> we'll allocate" and MAX_FB_WRITE_SIZE doesn't obviously do that.
> MAX_VGRF_SIZE? That seems better for a future where we want to
> indirectly address a large block of registers. But we're not going to
> want to register coalesce arrays. Maybe need two macros?
> Ken?

Yes, please.  MAX_GRF_SIZE is pretty generic.  MAX_MESSAGE_LENGTH, MAX_FB_WRITE_SIZE, or MAX_VGRF_SIZE would all be reasonable in my book.
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