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diff --git a/include/llvm/Transforms/Scalar/MemCpyOptimizer.h b/include/llvm/Transforms/Scalar/MemCpyOptimizer.h
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+//===---- MemCpyOptimizer.h - memcpy optimization ---------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass performs various transformations related to eliminating memcpy
+// calls, or transforming sets of stores into memset's.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
+#define LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/Analysis/GlobalsModRef.h"
+#include "llvm/Analysis/MemoryDependenceAnalysis.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+class MemCpyOptPass : public PassInfoMixin<MemCpyOptPass> {
+  MemoryDependenceResults *MD = nullptr;
+  TargetLibraryInfo *TLI = nullptr;
+  std::function<AliasAnalysis &()> LookupAliasAnalysis;
+  std::function<AssumptionCache &()> LookupAssumptionCache;
+  std::function<DominatorTree &()> LookupDomTree;
+
+public:
+  MemCpyOptPass() {}
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+  // Glue for the old PM.
+  bool runImpl(Function &F, MemoryDependenceResults *MD_,
+               TargetLibraryInfo *TLI_,
+               std::function<AliasAnalysis &()> LookupAliasAnalysis_,
+               std::function<AssumptionCache &()> LookupAssumptionCache_,
+               std::function<DominatorTree &()> LookupDomTree_);
+
+private:
+  // Helper functions
+  bool processStore(StoreInst *SI, BasicBlock::iterator &BBI);
+  bool processMemSet(MemSetInst *SI, BasicBlock::iterator &BBI);
+  bool processMemCpy(MemCpyInst *M);
+  bool processMemMove(MemMoveInst *M);
+  bool performCallSlotOptzn(Instruction *cpy, Value *cpyDst, Value *cpySrc,
+                            uint64_t cpyLen, unsigned cpyAlign, CallInst *C);
+  bool processMemCpyMemCpyDependence(MemCpyInst *M, MemCpyInst *MDep);
+  bool processMemSetMemCpyDependence(MemCpyInst *M, MemSetInst *MDep);
+  bool performMemCpyToMemSetOptzn(MemCpyInst *M, MemSetInst *MDep);
+  bool processByValArgument(CallSite CS, unsigned ArgNo);
+  Instruction *tryMergingIntoMemset(Instruction *I, Value *StartPtr,
+                                    Value *ByteVal);
+
+  bool iterateOnFunction(Function &F);
+};
+}
+
+#endif // LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H