Eliminate duplicate phi nodes in loops. Loop rotation, for example, can introduce these, and it's beneficial to later passes to clean them up.
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 2ab0972..44a2c1f 100644
--- a/lib/Transforms/Utils/LoopSimplify.cpp
+++ b/lib/Transforms/Utils/LoopSimplify.cpp
@@ -305,6 +305,12 @@
}
}
+ // 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;
}