tree d5ce0dbf63f6900e8fa0adbc6a9ecc616a935260
parent 9a54bd0794c462f5e965d137cc891ce6715b610b
author Yunqing Wang <yunqingwang@google.com> 1586972035 -0700
committer Yunqing Wang <yunqingwang@google.com> 1586995921 +0000

Reduce sub-pel precision to 1/2 in 2 mv searches

For speed >= 4, reduced sub-pel search precision to 1/2 pixel in TPL and
simple motion search to speed up encoding process.

Borg test result at speed 4:
       avg_psnr:  ovr_psnr:  ssim:   avg speed change:
hdres:  0.167	   0.171    -0.040        3.8%
midres: 0.030	   0.007    -0.238        3.8%
lowres: 0.147	   0.118    -0.160        3.1%

STATS_CHANGED

Change-Id: Ia03e0ee26f0dd6beb8342b1e608402e70a3731b9