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diff --git a/llvm/tools/llvm-mca/InstrBuilder.h b/llvm/tools/llvm-mca/InstrBuilder.h
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+++ b/llvm/tools/llvm-mca/InstrBuilder.h
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+//===--------------------- InstrBuilder.h -----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// A builder class for instructions that are statically analyzed by llvm-mca.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_MCA_INSTRBUILDER_H
+#define LLVM_TOOLS_LLVM_MCA_INSTRBUILDER_H
+
+#include "Dispatch.h"
+#include "Instruction.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+
+namespace mca {
+
+class DispatchUnit;
+
+/// \brief A builder class that knows how to construct Instruction objects.
+///
+/// Every llvm-mca Instruction is described by an object of class InstrDesc.
+/// An InstrDesc describes which registers are read/written by the instruction,
+/// as well as the instruction latency and hardware resources consumed.
+///
+/// This class is used by the tool to construct Instructions and instruction
+/// descriptors (i.e. InstrDesc objects).
+/// Information from the machine scheduling model is used to identify processor
+/// resources that are consumed by an instruction.
+class InstrBuilder {
+  const llvm::MCInstrInfo &MCII;
+  const llvm::ArrayRef<uint64_t> ProcResourceMasks;
+
+  llvm::DenseMap<unsigned short, std::unique_ptr<const InstrDesc>> Descriptors;
+  llvm::DenseMap<unsigned, std::unique_ptr<Instruction>> Instructions;
+
+  void createInstrDescImpl(const llvm::MCSubtargetInfo &STI,
+                           const llvm::MCInst &MCI);
+
+public:
+  InstrBuilder(const llvm::MCInstrInfo &mcii,
+               const llvm::ArrayRef<uint64_t> Masks)
+      : MCII(mcii), ProcResourceMasks(Masks) {}
+
+  const InstrDesc &getOrCreateInstrDesc(const llvm::MCSubtargetInfo &STI,
+                                        const llvm::MCInst &MCI);
+
+  Instruction *createInstruction(const llvm::MCSubtargetInfo &STI,
+                                 DispatchUnit &DU, unsigned Idx,
+                                 const llvm::MCInst &MCI);
+};
+
+} // namespace mca
+
+#endif