Francisco Jerez
0dd18d70ae
This is mainly meant to avoid shader-db regressions on SNB as we start using VGRFs for barycentrics more frequently. Currently the aligned_pairs_class is only useful in SIMD8 mode, because in SIMD16 mode barycentric vectors are typically 4 GRFs. This is not a problem on Gen4-5, because on those platforms all VGRF allocations are pair-aligned in SIMD16 mode. However on Gen6 we end up using either the fast or the slow path of LINTERP rather non-deterministically based on the behavior of the register allocator. Fix it by repurposing aligned_pairs_class to hold PLN-aligned registers of whatever the natural size of a barycentric vector is in the current dispatch width. On SNB this prevents the following shader-db regressions (including SIMD32 programs) in combination with the interpolation rework part of this series: total instructions in shared programs: 13983257 -> 14527274 (3.89%) instructions in affected programs: 1766255 -> 2310272 (30.80%) helped: 0 HURT: 11608 LOST: 26 GAINED: 13 Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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