Eliminate duplicate phi nodes in loops. Loop rotation, for example, can introduce...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89298 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Utils/LoopSimplify.cpp b/lib/Transforms/Utils/LoopSimplify.cpp
index 2ab0972149588b0bc31f1235931129ab702ebd77..44a2c1f851819c19c385ef41c764af659e10ff3a 100644 (file)
--- a/lib/Transforms/Utils/LoopSimplify.cpp
+++ b/lib/Transforms/Utils/LoopSimplify.cpp
@@ -305,6 +305,12 @@ ReprocessLoop:
     }
   }
 
+  // If there are duplicate phi nodes (for example, from loop rotation),
+  // get rid of them.
+  for (Loop::block_iterator BB = L->block_begin(), E = L->block_end();
+       BB != E; ++BB)
+    EliminateDuplicatePHINodes(*BB);
+
   return Changed;
 }