[Mesa-dev] [PATCH 6/7] i965/vec4/gs: Stop munging the ATTR containing gl_PointSize.

[Kenneth Graunke]

On Thursday, January 14, 2016 10:24:32 AM PST Matt Turner wrote:
> On Wed, Jan 13, 2016 at 8:33 PM, Kenneth Graunke <kenneth at whitecape.org> 
wrote:
> > gl_PointSize is delivered in the .w component of the VUE header, while
> > the language expects it to be a float (and thus in the .x component).
> > 
> > Previously, we emitted MOVs to copy it over to the .x component.
> > But this is silly - we can just use a .wwww swizzle and access it
> > without copying anything or clobbering the value stored at .x
> > (which admittedly is useless).
> > 
> > Removes the last use of ATTR destinations.
> > 
> > Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
> > ---
> 
> Oh, this must have been what you were working on when you asked me
> about <4,4,0> regions on 3-src instructions.
> 
> Reviewed-by: Matt Turner <mattst88 at gmail.com>

Nope, that was actually trying to convert SIMD8 TES from SINGLE_PATCH
mode to DUAL_PATCH mode (new on Skylake).  But I guess this would be
a <4,4,0> in align1 mode too :)

--Ken
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