Implement loop splitting analysis.

Determine which loop exit blocks need a 'pre-exit' block inserted.
Recognize when this would be impossible.

llvm-svn: 108941

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/include/llvm/Analysis/LoopInfo.h b/llvm/include/llvm/Analysis/LoopInfo.h
index b101f324429..5dfdc25dd88 100644
--- a/llvm/include/llvm/Analysis/LoopInfo.h
+++ b/llvm/include/llvm/Analysis/LoopInfo.h
@@ -509,6 +509,12 @@ protected:
   }
 };
 
+template<class BlockT, class LoopT>
+raw_ostream& operator<<(raw_ostream &OS, const LoopBase<BlockT, LoopT> &Loop) {
+  Loop.print(OS);
+  return OS;
+}
+
 class Loop : public LoopBase<BasicBlock, Loop> {
 public:
   Loop() {}