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diff --git a/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.h b/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.h
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+++ b/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.h
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+//==- WebAssemblyTargetTransformInfo.h - WebAssembly-specific TTI -*- C++ -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file a TargetTransformInfo::Concept conforming object specific
+/// to the WebAssembly target machine.
+///
+/// It uses the target's detailed information to provide more precise answers to
+/// certain TTI queries, while letting the target independent and default TTI
+/// implementations handle the rest.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETTRANSFORMINFO_H
+#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETTRANSFORMINFO_H
+
+#include "WebAssemblyTargetMachine.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+#include <algorithm>
+
+namespace llvm {
+
+class WebAssemblyTTIImpl final : public BasicTTIImplBase<WebAssemblyTTIImpl> {
+  typedef BasicTTIImplBase<WebAssemblyTTIImpl> BaseT;
+  typedef TargetTransformInfo TTI;
+  friend BaseT;
+
+  const WebAssemblyTargetMachine *TM;
+  const WebAssemblySubtarget *ST;
+  const WebAssemblyTargetLowering *TLI;
+
+  const WebAssemblySubtarget *getST() const { return ST; }
+  const WebAssemblyTargetLowering *getTLI() const { return TLI; }
+
+public:
+  WebAssemblyTTIImpl(const WebAssemblyTargetMachine *TM, Function &F)
+      : BaseT(TM), TM(TM), ST(TM->getSubtargetImpl(F)),
+        TLI(ST->getTargetLowering()) {}
+
+  // Provide value semantics. MSVC requires that we spell all of these out.
+  WebAssemblyTTIImpl(const WebAssemblyTTIImpl &Arg)
+      : BaseT(static_cast<const BaseT &>(Arg)), TM(Arg.TM), ST(Arg.ST),
+        TLI(Arg.TLI) {}
+  WebAssemblyTTIImpl(WebAssemblyTTIImpl &&Arg)
+      : BaseT(std::move(static_cast<BaseT &>(Arg))), TM(std::move(Arg.TM)),
+        ST(std::move(Arg.ST)), TLI(std::move(Arg.TLI)) {}
+  WebAssemblyTTIImpl &operator=(const WebAssemblyTTIImpl &RHS) {
+    BaseT::operator=(static_cast<const BaseT &>(RHS));
+    TM = RHS.TM;
+    ST = RHS.ST;
+    TLI = RHS.TLI;
+    return *this;
+  }
+  WebAssemblyTTIImpl &operator=(WebAssemblyTTIImpl &&RHS) {
+    BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
+    TM = std::move(RHS.TM);
+    ST = std::move(RHS.ST);
+    TLI = std::move(RHS.TLI);
+    return *this;
+  }
+
+  /// \name Scalar TTI Implementations
+  /// @{
+
+  // TODO: Implement more Scalar TTI for WebAssembly
+
+  TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth);
+
+  /// @}
+
+  /// \name Vector TTI Implementations
+  /// @{
+
+  // TODO: Implement Vector TTI for WebAssembly
+
+  /// @}
+};
+
+} // end namespace llvm
+
+#endif