Add a test for TCE return duplication.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124527 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/Transforms/Scalar/TailRecursionElimination.cpp b/lib/Transforms/Scalar/TailRecursionElimination.cpp
index 61f230804f..50d4cc3317 100644
--- a/lib/Transforms/Scalar/TailRecursionElimination.cpp
+++ b/lib/Transforms/Scalar/TailRecursionElimination.cpp
@@ -72,6 +72,7 @@
 using namespace llvm;
 
 STATISTIC(NumEliminated, "Number of tail calls removed");
+STATISTIC(NumRetDuped,   "Number of return duplicated");
 STATISTIC(NumAccumAdded, "Number of accumulators introduced");
 
 namespace {
@@ -606,6 +607,7 @@ bool TailCallElim::FoldReturnAndProcessPred(BasicBlock *BB,
       EliminateRecursiveTailCall(CI, FoldReturnIntoUncondBranch(Ret, BB, Pred),
                                  OldEntry, TailCallsAreMarkedTail, ArgumentPHIs,
                                  CannotTailCallElimCallsMarkedTail);
+      ++NumRetDuped;
       Change = true;
     }
   }