Index: lib/Analysis/TargetTransformInfo.cpp
===================================================================
--- lib/Analysis/TargetTransformInfo.cpp
+++ lib/Analysis/TargetTransformInfo.cpp
@@ -584,6 +584,12 @@
   return Cost;
 }
 
+int TargetTransformInfo::getMemcpyCost(const Instruction *I) const {
+  int Cost = TTIImpl->getMemcpyCost(I);
+  assert(Cost >= 0 && "TTI should not produce negative costs!");
+  return Cost;
+}
+
 int TargetTransformInfo::getArithmeticReductionCost(unsigned Opcode, Type *Ty,
                                                     bool IsPairwiseForm) const {
   int Cost = TTIImpl->getArithmeticReductionCost(Opcode, Ty, IsPairwiseForm);
Index: lib/Target/ARM/ARMTargetTransformInfo.h
===================================================================
--- lib/Target/ARM/ARMTargetTransformInfo.h
+++ lib/Target/ARM/ARMTargetTransformInfo.h
@@ -161,6 +161,8 @@
   int getAddressComputationCost(Type *Val, ScalarEvolution *SE,
                                 const SCEV *Ptr);
 
+  int getMemcpyCost(const Instruction *I);
+
   int getArithmeticInstrCost(
       unsigned Opcode, Type *Ty,
       TTI::OperandValueKind Op1Info = TTI::OK_AnyValue,
Index: lib/Target/ARM/ARMTargetTransformInfo.cpp
===================================================================
--- lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -401,6 +401,25 @@
   return 1;
 }
 
+int ARMTTIImpl::getMemcpyCost(const Instruction *I) {
+  std::vector<EVT> MemOps;
+  const Function *F = I->getParent()->getParent();
+  getTLI()->findOptimalMemOpLowering(MemOps,
+                                     100   /*Limit*/,
+                                     32    /*Size*/,
+                                     4     /*DstAlign*/,
+                                     4     /*SrcAlign*/,
+                                     false /*IsMemset*/,
+                                     false /*ZeroMemset*/,
+                                     false /*MemcpyStrSrc*/,
+                                     false /*AllowOverlap*/,
+                                     4     /*DstAS*/,
+                                     4     /*SrcAS*/,
+                                     *F);
+  return MemOps.size() * 2;
+}
+
+
 int ARMTTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index,
                                Type *SubTp) {
   if (Kind == TTI::SK_Broadcast) {