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diff --git a/llvm/utils/TableGen/AsmWriterInst.h b/llvm/utils/TableGen/AsmWriterInst.h
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+++ b/llvm/utils/TableGen/AsmWriterInst.h
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+//===- AsmWriterInst.h - Classes encapsulating a printable inst -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// These classes implement a parser for assembly strings.  The parser splits
+// the string into operands, which can be literal strings (the constant bits of
+// the string), actual operands (i.e., operands from the MachineInstr), and
+// dynamically-generated text, specified by raw C++ code.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_UTILS_TABLEGEN_ASMWRITERINST_H
+#define LLVM_UTILS_TABLEGEN_ASMWRITERINST_H
+
+#include <string>
+#include <vector>
+
+namespace llvm {
+  class CodeGenInstruction;
+  class Record;
+
+  struct AsmWriterOperand {
+    enum OpType {
+      // Output this text surrounded by quotes to the asm.
+      isLiteralTextOperand,
+      // This is the name of a routine to call to print the operand.
+      isMachineInstrOperand,
+      // Output this text verbatim to the asm writer.  It is code that
+      // will output some text to the asm.
+      isLiteralStatementOperand
+    } OperandType;
+
+    /// MiOpNo - For isMachineInstrOperand, this is the operand number of the
+    /// machine instruction.
+    unsigned MIOpNo;
+
+    /// Str - For isLiteralTextOperand, this IS the literal text.  For
+    /// isMachineInstrOperand, this is the PrinterMethodName for the operand..
+    /// For isLiteralStatementOperand, this is the code to insert verbatim
+    /// into the asm writer.
+    std::string Str;
+
+    /// MiModifier - For isMachineInstrOperand, this is the modifier string for
+    /// an operand, specified with syntax like ${opname:modifier}.
+    std::string MiModifier;
+
+    // To make VS STL happy
+    AsmWriterOperand(OpType op = isLiteralTextOperand):OperandType(op) {}
+
+    AsmWriterOperand(const std::string &LitStr,
+                     OpType op = isLiteralTextOperand)
+    : OperandType(op), Str(LitStr) {}
+
+    AsmWriterOperand(const std::string &Printer,
+                     unsigned _MIOpNo,
+                     const std::string &Modifier,
+                     OpType op = isMachineInstrOperand)
+    : OperandType(op), MIOpNo(_MIOpNo), Str(Printer), MiModifier(Modifier) {}
+
+    bool operator!=(const AsmWriterOperand &Other) const {
+      if (OperandType != Other.OperandType || Str != Other.Str) return true;
+      if (OperandType == isMachineInstrOperand)
+        return MIOpNo != Other.MIOpNo || MiModifier != Other.MiModifier;
+      return false;
+    }
+    bool operator==(const AsmWriterOperand &Other) const {
+      return !operator!=(Other);
+    }
+
+    /// getCode - Return the code that prints this operand.
+    std::string getCode(bool PassSubtarget) const;
+  };
+
+  class AsmWriterInst {
+  public:
+    std::vector<AsmWriterOperand> Operands;
+    const CodeGenInstruction *CGI;
+    unsigned CGIIndex;
+
+    AsmWriterInst(const CodeGenInstruction &CGI, unsigned CGIIndex,
+                  unsigned Variant);
+
+    /// MatchesAllButOneOp - If this instruction is exactly identical to the
+    /// specified instruction except for one differing operand, return the
+    /// differing operand number.  Otherwise return ~0.
+    unsigned MatchesAllButOneOp(const AsmWriterInst &Other) const;
+
+  private:
+    void AddLiteralString(const std::string &Str) {
+      // If the last operand was already a literal text string, append this to
+      // it, otherwise add a new operand.
+      if (!Operands.empty() &&
+          Operands.back().OperandType == AsmWriterOperand::isLiteralTextOperand)
+        Operands.back().Str.append(Str);
+      else
+        Operands.push_back(AsmWriterOperand(Str));
+    }
+  };
+}
+
+#endif