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
@@ -377,6 +377,8 @@
   bool collectFlatAddressOperands(SmallVectorImpl<int> &OpIndexes,
                                   Intrinsic::ID IID) const;
 
+  bool isNoopAddrSpaceCast(unsigned FromAS, unsigned ToAS) const;
+
   /// Rewrite intrinsic call \p II such that \p OldV will be replaced with \p
   /// NewV, which has a different address space. This should happen for every
   /// operand index that collectFlatAddressOperands returned for the intrinsic.
@@ -1275,6 +1277,7 @@
   virtual unsigned getFlatAddressSpace() = 0;
   virtual bool collectFlatAddressOperands(SmallVectorImpl<int> &OpIndexes,
                                           Intrinsic::ID IID) const = 0;
+  virtual bool isNoopAddrSpaceCast(unsigned FromAS, unsigned ToAS) const = 0;
   virtual Value *rewriteIntrinsicWithAddressSpace(IntrinsicInst *II,
                                                   Value *OldV,
                                                   Value *NewV) const = 0;
@@ -1546,6 +1549,10 @@
     return Impl.collectFlatAddressOperands(OpIndexes, IID);
   }
 
+  bool isNoopAddrSpaceCast(unsigned FromAS, unsigned ToAS) const override {
+    return Impl.isNoopAddrSpaceCast(FromAS, ToAS);
+  }
+
   Value *rewriteIntrinsicWithAddressSpace(IntrinsicInst *II, Value *OldV,
                                           Value *NewV) const override {
     return Impl.rewriteIntrinsicWithAddressSpace(II, OldV, NewV);
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
@@ -87,6 +87,8 @@
     return false;
   }
 
+  bool isNoopAddrSpaceCast(unsigned, unsigned) const { return false; }
+
   Value *rewriteIntrinsicWithAddressSpace(IntrinsicInst *II, Value *OldV,
                                           Value *NewV) const {
     return nullptr;
diff --git a/llvm/include/llvm/CodeGen/BasicTTIImpl.h b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
--- a/llvm/include/llvm/CodeGen/BasicTTIImpl.h
+++ b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
@@ -222,6 +222,10 @@
     return false;
   }
 
+  bool isNoopAddrSpaceCast(unsigned FromAS, unsigned ToAS) const {
+    return getTLI()->isNoopAddrSpaceCast(FromAS, ToAS);
+  }
+
   Value *rewriteIntrinsicWithAddressSpace(IntrinsicInst *II, Value *OldV,
                                           Value *NewV) const {
     return nullptr;
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
@@ -291,6 +291,11 @@
   return TTIImpl->collectFlatAddressOperands(OpIndexes, IID);
 }
 
+bool TargetTransformInfo::isNoopAddrSpaceCast(unsigned FromAS,
+                                              unsigned ToAS) const {
+  return TTIImpl->isNoopAddrSpaceCast(FromAS, ToAS);
+}
+
 Value *TargetTransformInfo::rewriteIntrinsicWithAddressSpace(
     IntrinsicInst *II, Value *OldV, Value *NewV) const {
   return TTIImpl->rewriteIntrinsicWithAddressSpace(II, OldV, NewV);