tree 4a5f73c0915b57f4ef1df4362765866fd14a4917
parent ee9c4d96436d97cef67ac9eac3ea2398c67acbb4
author Hui Su <huisu@google.com> 1515610630 -0800
committer Hui Su <huisu@google.com> 1515728255 +0000

Optimize intra reference availability check

Use binary flags to indicate if top-right/bottom-left referecne is
available. Pack these flags into 8-bit integers.

The table size is reduced by 8 times.

Change-Id: If026989f421f11b4fb5f54708d645f26435e5958