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David Barker authored
As per the linked bug report, the distance-weighted compound prediction has two separate round operations, first by 3 bits (inside the various convolve functions), then by 10 bits (after the convolution functions). We can improve on this by right shifting by 3 bits inside the convolve functions - this is equivalent to doing a single round by 13 bits at the end. Note: In the encoder, when doing joint_motion_search(), we do things a bit differently: So that we can try modifying the two "sides" of the prediction independently, we predict each side as if it were a single prediction (including rounding), then blend these single predictions together. This is already an approximation to the "real" prediction, even in the non-jnt-comp case. So we leave that code path as-is. BUG=aomedia:1289 Change-Id: I9ad1fbcb3e12db2b5fc3c82b407f0fd9e6b39750
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