[Mesa-dev] [PATCH] i965/fs: Replace subreg_offset with brw_reg's subnr.

[Matt Turner]

On Thu, Feb 11, 2016 at 3:33 PM, Francisco Jerez <currojerez at riseup.net> wrote:
> Would be really nice if we could also get rid of reg_offset as we're at
> it.  reg and subreg_offset basically represent the same thing but with
> different units, couldn't we just have a single offset field in bytes?
> Should it be part of brw_reg or backend_reg?  I think I would lean
> towards backend_reg.  In that case does it make sense to move this into
> brw_reg now only to move it back to backend_reg later on?

That would be nice.

I'm just not sure how to do it. brw_reg has to have the subnr field,
and it's nice if that's the field the higher levels use too.

I wonder -- is it possible that we could just get rid of reg_offset
too? For gathering data we have load_payload, so it's not useful
there. I think it's mainly useful for accessing elements of texturing
results. Is doubt there is a way we could avoid that though?