tree 9f10f49fd09798a8f07ebffb4ee357c135e56f9f
parent cf044318c5638df0c400b731e94fab948ebd5ccb
author buzbee <buzbee@google.com> 1326850427 -0800
committer buzbee <buzbee@google.com> 1327413632 -0800

Dataflow analysis rework

Rework key portions of the dataflow analysis code to avoid the
massive slowdowns we're seeing with methods containing more than
20,000 basic blocks.

Add a somewhat hacky lookup cache in front of findBlock.  Later
we'll want to rework the "GrowableList" mechanism to incorporate
this properly.

Add memory to the bit vector utilities to speed up the iterators
for large sparse vectors. (Similarly, in the future we'll want
to include a rewrite of the home-grown bit-vector manipluation
utilites to be better with large ones).

With this CL, compilation speed on the degenerate cases is > 10x
faster.  Compilation of typically-sized methods will see a smallish
improvement.

Change-Id: I7f086c1229dd4fe62f0a5fc361234bf204ebc2b1