44d7d66adc
We're about to change the layout of barycentric vectors, which will involve permuting the GRFs of barycentrics fetched from the thread payload. Make room for this in a function separate from the generic fetch_payload_reg(), since the permutation will only be applicable to barycentric vectors. This allows simplifying fetch_payload_reg(), since there was no need for handling multiple-component payload registers except for barycentrics. This causes some minor shader-db noise due to the new helper emitting a LOAD_PAYLOAD instruction unconditionally, but it will be cleaned up shortly. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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