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vp9: Adjust speed features for speed 8 at low resoln.

For low resolutions (<= CIF): use quarter-pixel and simple_block_yrd.

~5% gain on RTC_derf.
~6-7% slowdown on ARM.

Change-Id: I4439ebd1116b9decac04786503f978840b68a60c

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -533,7 +533,11 @@

     if (cpi->row_mt && cpi->oxcf.max_threads > 1)

       sf->adaptive_rd_thresh_row_mt = 1;

-    sf->mv.subpel_force_stop = (content == VP9E_CONTENT_SCREEN) ? 3 : 2;

+    if (content == VP9E_CONTENT_SCREEN)

+      sf->mv.subpel_force_stop = 3;

+    else if (cm->width > 352 && cm->height > 288)

+      sf->mv.subpel_force_stop = 2;

+

     if (content == VP9E_CONTENT_SCREEN) sf->lpf_pick = LPF_PICK_MINIMAL_LPF;

     // Only keep INTRA_DC mode for speed 8.

     if (!is_keyframe) {

@@ -555,13 +559,13 @@

       }

       // Since the short_circuit_low_temp_var is used, reduce the

       // adaptive_rd_thresh level.

-      if (cm->width > 320 && cm->height > 240)

+      if (cm->width > 352 && cm->height > 288)

         sf->adaptive_rd_thresh = 1;

       else

         sf->adaptive_rd_thresh = 2;

     }

     sf->limit_newmv_early_exit = 0;

-    if (cm->width > 320 && cm->height > 240) sf->use_simple_block_yrd = 1;

+    sf->use_simple_block_yrd = 1;

   }

   // Turn off adaptive_rd_thresh if row_mt is on for speed 5, 6, 7.

   if (speed >= 5 && speed < 8 && cpi->row_mt && cpi->num_workers > 1) {

-- 

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