diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 8a866963803114..461a737416484c 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -449,10 +449,6 @@ class MachineBlockPlacement : public MachineFunctionPass {
       const MachineBasicBlock *BB, const BlockChain &Chain,
       const BlockFilterSet *BlockFilter,
       SmallVector<MachineBasicBlock *, 4> &Successors);
-  bool shouldPredBlockBeOutlined(
-      const MachineBasicBlock *BB, const MachineBasicBlock *Succ,
-      const BlockChain &Chain, const BlockFilterSet *BlockFilter,
-      BranchProbability SuccProb, BranchProbability HotProb);
   bool isBestSuccessor(MachineBasicBlock *BB, MachineBasicBlock *Pred,
                        BlockFilterSet *BlockFilter);
   void findDuplicateCandidates(SmallVectorImpl<MachineBasicBlock *> &Candidates,