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v2: - TG4 does not calculate derivatives (Ilia) - also handle SAMPLE* instructions (Roland) Cc: 12.0 <mesa-stable@lists.freedesktop.org> Reviewed-by: Marek Olšák <marek.olsak@amd.com> (v1) Reviewed-by: Brian Paul <brianp@vmware.com> (v1) Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu> Reviewed-by: Roland Scheidegger <sroland@vmware.com>