Andrew Trick b52a8564ce SchedDFS: Refactor and tweak the subtree selection criteria.
For sanity, create a root when NumDataSuccs >= 4. Splitting large
subtrees will no longer be detrimental after my next checkin to handle
nested tree. A magic number of 4 is fine because single subtrees
seldom rejoin more than this. It makes subtrees easier to visualize
and heuristics more sane.

llvm-svn: 173399
2013-01-25 00:12:57 +00:00
2013-01-24 22:52:42 +00:00
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