Make EliminateDuplicatePHINodes() available as a utility function

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89297 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Transforms/Utils/Local.h b/include/llvm/Transforms/Utils/Local.h
index 292af1dbfc4881afdf346295a53d4e58c0423600..e6687bb24899d1ac69b201c16527a95b227ccfc5 100644 (file)
--- a/include/llvm/Transforms/Utils/Local.h
+++ b/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/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 8dbc8081c5a40cf3058fc8982fad8482c3fa805a..89b0bd9b31ac1000c9854fb1db156dff3db9db85 100644 (file)
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/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