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Intrinsics must be used, how else is the hardware invoked?

>PureVideo occupies a considerable amount of a GPU's die area

Video decoders live somewhere in the general vicinity of the GPU and aren't invoked through CPU instructions. AFAIK.

This thread is about Intel processors, not GPUs

The VP9/H.265 support in Intel chips is on the GPU side.

Thanks for the correction. I think my core point still holds without the intrinsics but I was mistaken on that point.