Use the pred_mv feature for speed 0

Before this patch, pred_mv is used only when the
adaptive_motion_search speed feature is on(speed>=1).
This patch enables pred_mv for speed 0 as well.

Coding gains:
         avg_psnr   ovr_psnr   ssim
lowres   -0.31%     -0.32%    -0.38%
midres   -0.37%     -0.41%    -0.42%
hdres    -0.30%     -0.31%    -0.29%

Tested encoding speed over 18 midres sequences with QP=40. The
overall speed loss is about 0.6%.

Change-Id: I8987e9efb5a70d2bf8779fc2a43838009f9bbd8a
diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index a172af3..cb5cb19 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -3963,7 +3963,7 @@
   }
 
   // store estimated motion vector
-  if (cpi->sf.adaptive_motion_search) store_pred_mv(x, ctx);
+  store_pred_mv(x, ctx);
 
   // If the interp_filter is marked as SWITCHABLE_FILTERS, it was for an
   // intra block and used for context purposes.
@@ -3978,7 +3978,7 @@
   // the starting point of motion search in the following partition type check.
   if (do_split || must_split) {
     subsize = get_subsize(bsize, PARTITION_SPLIT);
-    if (cpi->sf.adaptive_motion_search) load_pred_mv(x, ctx);
+    load_pred_mv(x, ctx);
     if (bsize == BLOCK_8X8) {
       i = 4;
       if (cpi->sf.adaptive_pred_interp_filter && partition_none_allowed)
@@ -4091,7 +4091,7 @@
     const int64_t part_mode_rdcost =
         RDCOST(partition_mul, x->rddiv, part_mode_rate, 0);
     subsize = get_subsize(bsize, PARTITION_HORZ);
-    if (cpi->sf.adaptive_motion_search) load_pred_mv(x, ctx);
+    load_pred_mv(x, ctx);
     if (cpi->sf.adaptive_pred_interp_filter && bsize == BLOCK_8X8 &&
         partition_none_allowed)
       pc_tree->horizontal[0].pred_interp_filter = pred_interp_filter;
@@ -4141,7 +4141,7 @@
     const int64_t part_mode_rdcost =
         RDCOST(partition_mul, x->rddiv, part_mode_rate, 0);
     subsize = get_subsize(bsize, PARTITION_VERT);
-    if (cpi->sf.adaptive_motion_search) load_pred_mv(x, ctx);
+    load_pred_mv(x, ctx);
     if (cpi->sf.adaptive_pred_interp_filter && bsize == BLOCK_8X8 &&
         partition_none_allowed)
       pc_tree->vertical[0].pred_interp_filter = pred_interp_filter;
@@ -4683,7 +4683,7 @@
   // PARTITION_HORZ
   if (partition_horz_allowed && do_rect) {
     subsize = get_subsize(bsize, PARTITION_HORZ);
-    if (sf->adaptive_motion_search) load_pred_mv(x, ctx);
+    load_pred_mv(x, ctx);
     pc_tree->horizontal[0].pred_pixel_ready = 1;
     nonrd_pick_sb_modes(cpi, tile_data, x, mi_row, mi_col, &sum_rdc, subsize,
                         &pc_tree->horizontal[0]);
@@ -4727,7 +4727,7 @@
   // PARTITION_VERT
   if (partition_vert_allowed && do_rect) {
     subsize = get_subsize(bsize, PARTITION_VERT);
-    if (sf->adaptive_motion_search) load_pred_mv(x, ctx);
+    load_pred_mv(x, ctx);
     pc_tree->vertical[0].pred_pixel_ready = 1;
     nonrd_pick_sb_modes(cpi, tile_data, x, mi_row, mi_col, &sum_rdc, subsize,
                         &pc_tree->vertical[0]);
diff --git a/vp9/encoder/vp9_rd.c b/vp9/encoder/vp9_rd.c
index dcdd00d..5ce2282 100644
--- a/vp9/encoder/vp9_rd.c
+++ b/vp9/encoder/vp9_rd.c
@@ -545,8 +545,7 @@
   uint8_t *src_y_ptr = x->plane[0].src.buf;
   uint8_t *ref_y_ptr;
   const int num_mv_refs =
-      MAX_MV_REF_CANDIDATES +
-      (cpi->sf.adaptive_motion_search && block_size < x->max_partition_size);
+      MAX_MV_REF_CANDIDATES + (block_size < x->max_partition_size);
 
   MV pred_mv[3];
   pred_mv[0] = x->mbmi_ext->ref_mvs[ref_frame][0].as_mv;
diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index b20d573..282cf2f 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -2019,8 +2019,7 @@
             seg_mvs[i][mi->ref_frame[0]].as_mv = *new_mv;
           }
 
-          if (sf->adaptive_motion_search)
-            x->pred_mv[mi->ref_frame[0]] = *new_mv;
+          x->pred_mv[mi->ref_frame[0]] = *new_mv;
 
           // restore src pointers
           mi_buf_restore(x, orig_src, orig_pre);
@@ -2363,7 +2362,7 @@
   }
 
   if (cpi->sf.adaptive_motion_search && bsize < BLOCK_64X64) {
-    int boffset =
+    const int boffset =
         2 * (b_width_log2_lookup[BLOCK_64X64] -
              VPXMIN(b_height_log2_lookup[bsize], b_width_log2_lookup[bsize]));
     step_param = VPXMAX(step_param, boffset);
@@ -2447,7 +2446,7 @@
   *rate_mv = vp9_mv_bit_cost(&tmp_mv->as_mv, &ref_mv, x->nmvjointcost,
                              x->mvcost, MV_COST_WEIGHT);
 
-  if (cpi->sf.adaptive_motion_search) x->pred_mv[ref] = tmp_mv->as_mv;
+  x->pred_mv[ref] = tmp_mv->as_mv;
 
   if (scaled_ref_frame) {
     int i;