tree f65f7c303826e71b38465fa6083969837f440ff6
parent 07663e4e18b9c1b5c2916676d3d9c266e0c00299
author Jonathan Wright <jonathan.wright@arm.com> 1680701708 +0100
committer James Zern <jzern@google.com> 1680805388 +0000

Specialize Neon OBMC subpel variance by filter value

Use the same specialization for Neon OBMC subpel variance functions as
used for the other Neon subpel variants. The rationale for the
specialization is as follows:

The optimal implementation of the bilinear interpolation depends on
the filter values being used. For both horizontal and vertical
interpolation this can simplify to just taking the source values, or
averaging the source and reference values - which can be computed
more easily than a bilinear interpolation with arbitrary filter
values.

This patch introduces tests to find the most optimal bilinear
interpolation implementation based on the filter values being used.
This new specialization is only used for larger block sizes
(>= 16x16) as we need to be doing enough work to make the cost of
finding the optimal implementation worth it.

Change-Id: If90f3b6120fe2a2a1a7a834dba96a73224224f30