Francisco Jerez
14f0a5cf64
The heuristic enables the SIMD32 fragment shader based on whether the IR performance modeling pass predicts it to have greater throughput than the SIMD16 and SIMD8 variants of the same shader. It would be straightforward to do the same thing in order to control whether SIMD16 dispatch is enabled, but it's pending additional performance evaluation. The INTEL_DEBUG=do32 option is left around in order to force the SIMD32 shader to be used regardless of the result of the heuristic, since it's useful as a debugging aid e.g. in order to identify SIMD32-specific codegen issues which may be masked by the SIMD32 heuristic, or cases where the heuristic is incorrectly disabling SIMD32 shaders that offer a performance advantage. Currently this is only enabled on Gen6+, since SIMD32 codegen support is incomplete on earlier platforms. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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