Make EliminateDuplicatePHINodes() available as a utility function

llvm-svn: 89297

2 files changed, 9 insertions, 2 deletions

diff --git a/llvm/include/llvm/Transforms/Utils/Local.h b/llvm/include/llvm/Transforms/Utils/Local.h
index 292af1dbfc4..e6687bb2489 100644
--- a/llvm/include/llvm/Transforms/Utils/Local.h
+++ b/llvm/include/llvm/Transforms/Utils/Local.h
@@ -107,7 +107,14 @@ void MergeBasicBlockIntoOnlyPred(BasicBlock *BB, Pass *P = 0);
 /// rewriting all the predecessors to branch to the successor block and return
 /// true.  If we can't transform, return false.
 bool TryToSimplifyUncondBranchFromEmptyBlock(BasicBlock *BB);
-    
+
+/// EliminateDuplicatePHINodes - Check for and eliminate duplicate PHI
+/// nodes in this block. This doesn't try to be clever about PHI nodes
+/// which differ only in the order of the incoming values, but instcombine
+/// orders them so it usually won't matter.
+///
+bool EliminateDuplicatePHINodes(BasicBlock *BB);
+
 /// SimplifyCFG - This function is used to do simplification of a CFG.  For
 /// example, it adjusts branches to branches to eliminate the extra hop, it
 /// eliminates unreachable basic blocks, and does other "peephole" optimization
diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 8dbc8081c5a..89b0bd9b31a 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -1594,7 +1594,7 @@ static bool SimplifyCondBranchToCondBranch(BranchInst *PBI, BranchInst *BI) {
 /// which differ only in the order of the incoming values, but instcombine
 /// orders them so it usually won't matter.
 ///
-static bool EliminateDuplicatePHINodes(BasicBlock *BB) {
+bool llvm::EliminateDuplicatePHINodes(BasicBlock *BB) {
   bool Changed = false;
   
   // This implementation doesn't currently consider undef operands