While Tiger Lake has AV1 decode now with the Gen12 Xe Graphics, for those making use of the dav1d decoder there was a noticeable speed-up when making use of -march=tigerlake for building it.
Other open-source video encoders were also benefiting nicely from -march=tigerlake for compiling these workloads. The improvements came as a bit of a surprise considering many video encoders already leverage hand-tuned Assembly.