shithub: libvpx

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Remove unnecessary memset(best_index, 0) from trellis/optimize.

First 50 frames of bus @ 1500kbps (speed 0) goes from 2min12.6 to
2min11.6, i.e. 0.75% overall speedup.

Change-Id: I67054f8146e82a02b6457c51a1c8627a937e5e1e

--- a/vp9/encoder/vp9_encodemb.c

+++ b/vp9/encoder/vp9_encodemb.c

@@ -188,7 +188,6 @@

   if (mb->e_mbd.mode_info_context->mbmi.ref_frame[0] == INTRA_FRAME)

     rdmult = (rdmult * 9) >> 4;

   rddiv = mb->rddiv;

-  memset(best_index, 0, sizeof(best_index));

   /* Initialize the sentinel node of the trellis. */

   tokens[eob][0].rate = 0;

   tokens[eob][0].error = 0;

@@ -318,6 +317,7 @@

             mb->token_costs[tx_size][type][ref][1][band][0][t1];

         tokens[next][1].token = ZERO_TOKEN;

       }

+      best_index[i][0] = best_index[i][1] = 0;

       /* Don't update next, because we didn't add a new node. */

     }

   }

-- 

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