diff --git a/llvm/include/llvm/Analysis/TargetTransformInfo.h b/llvm/include/llvm/Analysis/TargetTransformInfo.h
--- a/llvm/include/llvm/Analysis/TargetTransformInfo.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfo.h
@@ -293,7 +293,7 @@
 
   /// \return the expected cost of a memcpy, which could e.g. depend on the
   /// source/destination type and alignment and the number of bytes copied.
-  int getMemcpyCost(const Instruction *I) const;
+  InstructionCost getMemcpyCost(const Instruction *I) const;
 
   /// \return The estimated number of case clusters when lowering \p 'SI'.
   /// \p JTSize Set a jump table size only when \p SI is suitable for a jump
@@ -1408,7 +1408,7 @@
   virtual unsigned getInliningThresholdMultiplier() = 0;
   virtual unsigned adjustInliningThreshold(const CallBase *CB) = 0;
   virtual int getInlinerVectorBonusPercent() = 0;
-  virtual int getMemcpyCost(const Instruction *I) = 0;
+  virtual InstructionCost getMemcpyCost(const Instruction *I) = 0;
   virtual unsigned
   getEstimatedNumberOfCaseClusters(const SwitchInst &SI, unsigned &JTSize,
                                    ProfileSummaryInfo *PSI,
@@ -1709,7 +1709,7 @@
   int getInlinerVectorBonusPercent() override {
     return Impl.getInlinerVectorBonusPercent();
   }
-  int getMemcpyCost(const Instruction *I) override {
+  InstructionCost getMemcpyCost(const Instruction *I) override {
     return Impl.getMemcpyCost(I);
   }
   InstructionCost getUserCost(const User *U, ArrayRef<const Value *> Operands,
diff --git a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
--- a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -75,7 +75,7 @@
 
   int getInlinerVectorBonusPercent() const { return 150; }
 
-  unsigned getMemcpyCost(const Instruction *I) const {
+  InstructionCost getMemcpyCost(const Instruction *I) const {
     return TTI::TCC_Expensive;
   }
 
diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -885,8 +885,8 @@
   return Cost;
 }
 
-int TargetTransformInfo::getMemcpyCost(const Instruction *I) const {
-  int Cost = TTIImpl->getMemcpyCost(I);
+InstructionCost TargetTransformInfo::getMemcpyCost(const Instruction *I) const {
+  InstructionCost Cost = TTIImpl->getMemcpyCost(I);
   assert(Cost >= 0 && "TTI should not produce negative costs!");
   return Cost;
 }
diff --git a/llvm/lib/Target/ARM/ARMTargetTransformInfo.h b/llvm/lib/Target/ARM/ARMTargetTransformInfo.h
--- a/llvm/lib/Target/ARM/ARMTargetTransformInfo.h
+++ b/llvm/lib/Target/ARM/ARMTargetTransformInfo.h
@@ -183,7 +183,7 @@
     return isLegalMaskedGather(Ty, Alignment);
   }
 
-  int getMemcpyCost(const Instruction *I);
+  InstructionCost getMemcpyCost(const Instruction *I);
 
   int getNumMemOps(const IntrinsicInst *I) const;
 
diff --git a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
--- a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -1126,7 +1126,7 @@
   return -1;
 }
 
-int ARMTTIImpl::getMemcpyCost(const Instruction *I) {
+InstructionCost ARMTTIImpl::getMemcpyCost(const Instruction *I) {
   int NumOps = getNumMemOps(cast<IntrinsicInst>(I));
 
   // To model the cost of a library call, we assume 1 for the call, and