The compound mode can only be run between two reference frames
with different sign bias flags. Skip the search over same sign
bias reference frames in the rate-distortion optimization.
Change-Id: I4a57feedea880883cf87200de51862beac108310
if (comp_pred) {
if (!cpi->allow_comp_inter_inter) continue;
+ if (cm->ref_frame_sign_bias[ref_frame] ==
+ cm->ref_frame_sign_bias[second_ref_frame])
+ continue;
+
// Skip compound inter modes if ARF is not available.
if (!(cpi->ref_frame_flags & flag_list[second_ref_frame])) continue;