commit f9c1f5b86bc1757e3f7e11110b36f4b419ec9c36
author chiyotsai <chiyotsai@google.com> Fri Mar 29 10:16:49 2019 -0700
committer Chi Yo Tsai <chiyotsai@google.com> Sat Mar 30 00:34:47 2019 +0000
tree edb80bdc6803944d428864d88cfe12dccc587978
parent 8ea87322e99c3f74247a59571bcfdacd82836618

Reduce number of ref to one in simple_motion_search

Simple motion search's overhead starts to become significant on speed
settings >= 3. Disabling this it helps us to speed up by about 0.5%.

Performance on midres:
  SPD  |  AVG_PSNR  |  OVR_PSNR  |   SSIM   |  AVG_SPDUP  |
   1   |   +0.002   |   +0.001   |  +0.010  |   +0.134%   |
   2   |   -0.002   |   +0.004   |  -0.016  |   +1.324%   |
   3   |   +0.008   |   +0.005   |  +0.024  |   +1.322%   |
   4   |   +0.008   |   +0.006   |  +0.016  |   +0.896%   |

STATS_CHANGED

Change-Id: Iac1c9b97cb97c79147a6682695508d4ad9a87264

av1/encoder/partition_strategy.c

diff --git a/av1/encoder/partition_strategy.c b/av1/encoder/partition_strategy.c
index e8270b3..23c2ef4 100644
--- a/av1/encoder/partition_strategy.c
+++ b/av1/encoder/partition_strategy.c
@@ -222,8 +222,9 @@
          cpi->ref_frame_flags & av1_ref_frame_flag_list[ALTREF_FRAME]);
 
   // Setting up motion search
-  const int ref_list[] = { LAST_FRAME, ALTREF_FRAME };
-  const int num_refs = 2;
+  const int ref_list[] = { cpi->rc.is_src_frame_alt_ref ? ALTREF_FRAME
+                                                        : LAST_FRAME };
+  const int num_refs = 1;
   const int use_subpixel = 1;
 
   unsigned int int_features[FEATURE_SIZE_SMS_PRUNE_PART - 1];