[Mesa-dev] Call i965 GLSL IR backend optimisation from the common linker

[Timothy Arceri]

Ping ... most of these are tidy ups and can be reviewed individually.
Also patch 13 has landed.

On Wed, 2016-07-27 at 15:20 +1000, Timothy Arceri wrote:
> The ultimate goal is to be able to convert to NIR and make use of its
> optimisations before assigning varying and uniform locations. This
> should allow us to start removing some of the GLSL IR optimisation
> passes.
> 
> This series falls short of making use of NIR because
> lower_packed_varyings()
> modifies the IR after we assign varying locations. I can see two ways
> around this, listing them in increasing difficultly level they would
> be:
> 
> - replacing the current packing pass with one that follows the
> packing
> rules of ARB_enhanced_layouts this would mean we can no longer pack
> across slots and matrix and array packing effectivness would be
> slightly
> decreased.
> - write a NIR packing pass.
> 
> Even without converting to NIR this series solves a number of the
> other
> problems with converting to NIR earlier and provides a nice shader-db
> improvement on its own.
> 
> Broadwell shader-db results:
> 
> total instructions in shared programs: 8651650 -> 8644415 (-0.08%)
> instructions in affected programs:     38754 -> 31519 (-18.67%)
> total loops in shared programs:        2085 -> 2085 (0.00%)
> helped:                                320
> HURT:                                  0
> GAINED:                                0
> 
> Ivybridge reported no difference.
> 
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