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Turn on ml_var_partition_pruning for HBD

This affects speed 0 and 1 only.

Tested on lowres_bd10(480p) and midres_bd10(720p),
                   speed 0       speed 1
coding loss:        0.07%         0.10%
encoder speedup:     14%          6.5%

Change-Id: I5812400d8c7393321b7284d3fca06026842390b5

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

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

@@ -3404,7 +3404,15 @@

   MACROBLOCKD *xd = &x->e_mbd;

   MODE_INFO *mi = xd->mi[0];

   const NN_CONFIG *nn_config = NULL;

-  DECLARE_ALIGNED(16, uint8_t, pred_buf[64 * 64]);

+#if CONFIG_VP9_HIGHBITDEPTH

+  DECLARE_ALIGNED(16, uint8_t, pred_buffer[64 * 64 * 2]);

+  uint8_t *const pred_buf = (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH)

+                                ? (CONVERT_TO_BYTEPTR(pred_buffer))

+                                : pred_buffer;

+#else

+  DECLARE_ALIGNED(16, uint8_t, pred_buffer[64 * 64]);

+  uint8_t *const pred_buf = pred_buffer;

+#endif  // CONFIG_VP9_HIGHBITDEPTH

   const int speed = cpi->oxcf.speed;

   int i;

   float thresh = 0.0f;

@@ -3475,7 +3483,12 @@

   {

     float features[FEATURES] = { 0.0f };

+#if CONFIG_VP9_HIGHBITDEPTH

+    const int dc_q =

+        vp9_dc_quant(cm->base_qindex, 0, cm->bit_depth) >> (xd->bd - 8);

+#else

     const int dc_q = vp9_dc_quant(cm->base_qindex, 0, cm->bit_depth);

+#endif  // CONFIG_VP9_HIGHBITDEPTH

     int feature_idx = 0;

     float score;

@@ -3758,14 +3771,10 @@

   pc_tree->partitioning = PARTITION_NONE;

   if (cpi->sf.ml_var_partition_pruning) {

-    int do_ml_var_partition_pruning =

+    const int do_ml_var_partition_pruning =

         !frame_is_intra_only(cm) && partition_none_allowed && do_split &&

         mi_row + num_8x8_blocks_high_lookup[bsize] <= cm->mi_rows &&

         mi_col + num_8x8_blocks_wide_lookup[bsize] <= cm->mi_cols;

-#if CONFIG_VP9_HIGHBITDEPTH

-    if (x->e_mbd.cur_buf->flags & YV12_FLAG_HIGHBITDEPTH)

-      do_ml_var_partition_pruning = 0;

-#endif  // CONFIG_VP9_HIGHBITDEPTH

     if (do_ml_var_partition_pruning) {

       ml_predict_var_rd_paritioning(cpi, x, bsize, mi_row, mi_col,

                                     &partition_none_allowed, &do_split);