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We skip iterations with ifs. These can be optimized aways after the subgroup size is known. Every driver should do that because applications depend on it anyway. Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37164>