shithub: libvpx

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vp9: Only compute y_sad for golden in variance partition for speed < 8.

Only affects speed 8. No obvious quality regression. Systematic speed
ups by ~1% on Nexus 6.

Change-Id: Ia904ca28ea041c3281c532911ec38fb7d7f46a17

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1043,7 +1043,9 @@

       yv12_g = get_ref_frame_buffer(cpi, GOLDEN_FRAME);

     }

-    if (yv12_g && yv12_g != yv12 && (cpi->ref_frame_flags & VP9_GOLD_FLAG)) {

+    // Only compute y_sad_g (sad for golden reference) for speed < 8.

+    if (cpi->oxcf.speed < 8 && yv12_g && yv12_g != yv12 &&

+        (cpi->ref_frame_flags & VP9_GOLD_FLAG)) {

       vp9_setup_pre_planes(xd, 0, yv12_g, mi_row, mi_col,

                            &cm->frame_refs[GOLDEN_FRAME - 1].sf);

       y_sad_g = cpi->fn_ptr[bsize].sdf(