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Commit 3b3de7c2 authored by Evan Cheng's avatar Evan Cheng
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- CodeGenPrepare does not split loop back edges but it only knows about back... 

- CodeGenPrepare does not split loop back edges but it only knows about back edges of single block loops. It now does a DFS walk to find loop back edges.
- Use SplitBlockPredecessors to factor out common predecessors of the critical edge destination. This is disabled for now due to some regressions.

llvm-svn: 61248
parent 8c036a3a
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