Index validation and caching in ANGLE is implemented in a very complex way, and
there are a lot of slow operations involved, like std::map lookups and frequent
integer division. Both the readability and the performance of the code could be
improved.
Some suggestions:
1. Replace usage of division with bitshifts where possible
2. Replace usage of % with & where possible
3. Replace usage of std::map lookups from static structures with switch
statements or simpler lookups where possible.
3. Remove streamOffset from the index range cache, and always compute it
dynamically instead. This will simplify maintaining the cache - adding items to
the cache doesn't need to be deferred until the streamOffset is known. This
will not cost too much performance, since with above optimizations computing
streamOffset should be fast.
Similar optimizations could also be performed in other areas of the code.
Original issue reported on code.google.com by oetu...@nvidia.com on 24 Mar 2015 at 3:38
Original issue reported on code.google.com by
oetu...@nvidia.comon 24 Mar 2015 at 3:38