tgsi: add DDIV instruction

Double-precision division, to allow more precision than a DRCP + DMUL
sequence.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
4 files changed