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Move token_cache from cost_coeffs to MACROBLOCK

This commit moves token_cache buffer into macroblock struct, instead
of defining as a local variable in cost_coeffs. This avoids repeatedly
re-allocating memory space in the rate-distortion optimization loop.

The runtime at speed 0 reduces:
bus 2000kbps, 161692ms to 159951ms
football 600kbps, 229505ms to 225821ms

Change-Id: If7da6b0b6d8c5138a16271a33c4548fba33d8840

--- a/vp9/encoder/vp9_block.h

+++ b/vp9/encoder/vp9_block.h

@@ -135,6 +135,7 @@

   // note that token_costs is the cost when eob node is skipped

   vp9_coeff_cost token_costs[TX_SIZES];

+  uint8_t token_cache[1024];

   int optimize;

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -467,12 +467,12 @@

   { 1, 2, 3, 4, 11, 1024 - 21, 0 },

 };

-static INLINE int cost_coeffs(MACROBLOCK *mb,

+static INLINE int cost_coeffs(MACROBLOCK *x,

                               int plane, int block,

                               ENTROPY_CONTEXT *A, ENTROPY_CONTEXT *L,

                               TX_SIZE tx_size,

                               const int16_t *scan, const int16_t *nb) {

-  MACROBLOCKD *const xd = &mb->e_mbd;

+  MACROBLOCKD *const xd = &x->e_mbd;

   MB_MODE_INFO *mbmi = &xd->this_mi->mbmi;

   struct macroblockd_plane *pd = &xd->plane[plane];

   const PLANE_TYPE type = pd->plane_type;

@@ -481,9 +481,9 @@

   const int16_t *const qcoeff_ptr = BLOCK_OFFSET(pd->qcoeff, block);

   const int ref = mbmi->ref_frame[0] != INTRA_FRAME;

   unsigned int (*token_costs)[2][PREV_COEF_CONTEXTS][MAX_ENTROPY_TOKENS] =

-                   mb->token_costs[tx_size][type][ref];

+                   x->token_costs[tx_size][type][ref];

   const ENTROPY_CONTEXT above_ec = !!*A, left_ec = !!*L;

-  uint8_t token_cache[1024];

+  uint8_t *p_tok = x->token_cache;

   int pt = combine_entropy_contexts(above_ec, left_ec);

   int c, cost;

@@ -502,7 +502,7 @@

     int v = qcoeff_ptr[0];

     int prev_t = vp9_dct_value_tokens_ptr[v].token;

     cost = (*token_costs)[0][pt][prev_t] + vp9_dct_value_cost_ptr[v];

-    token_cache[0] = vp9_pt_energy_class[prev_t];

+    p_tok[0] = vp9_pt_energy_class[prev_t];

     ++token_costs;

     // ac tokens

@@ -512,9 +512,9 @@

       v = qcoeff_ptr[rc];

       t = vp9_dct_value_tokens_ptr[v].token;

-      pt = get_coef_context(nb, token_cache, c);

+      pt = get_coef_context(nb, p_tok, c);

       cost += (*token_costs)[!prev_t][pt][t] + vp9_dct_value_cost_ptr[v];

-      token_cache[rc] = vp9_pt_energy_class[t];

+      p_tok[rc] = vp9_pt_energy_class[t];

       prev_t = t;

       if (!--band_left) {

         band_left = *band_count++;

@@ -524,7 +524,7 @@

     // eob token

     if (band_left) {

-      pt = get_coef_context(nb, token_cache, c);

+      pt = get_coef_context(nb, p_tok, c);

       cost += (*token_costs)[0][pt][DCT_EOB_TOKEN];

     }

   }

-- 

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