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diff --git a/contrib/llvm-project/llvm/include/llvm/MC/SubtargetFeature.h b/contrib/llvm-project/llvm/include/llvm/MC/SubtargetFeature.h
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+//===- llvm/MC/SubtargetFeature.h - CPU characteristics ---------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file Defines and manages user or tool specified CPU characteristics.
+/// The intent is to be able to package specific features that should or should
+/// not be used on a specific target processor.  A tool, such as llc, could, as
+/// as example, gather chip info from the command line, a long with features
+/// that should be used on that chip.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_SUBTARGETFEATURE_H
+#define LLVM_MC_SUBTARGETFEATURE_H
+
+#include "llvm/ADT/StringRef.h"
+#include <array>
+#include <bitset>
+#include <initializer_list>
+#include <string>
+#include <vector>
+
+namespace llvm {
+
+class raw_ostream;
+class Triple;
+
+const unsigned MAX_SUBTARGET_WORDS = 3;
+const unsigned MAX_SUBTARGET_FEATURES = MAX_SUBTARGET_WORDS * 64;
+
+/// Container class for subtarget features.
+/// This is convenient because std::bitset does not have a constructor
+/// with an initializer list of set bits.
+class FeatureBitset : public std::bitset<MAX_SUBTARGET_FEATURES> {
+public:
+  // Cannot inherit constructors because it's not supported by VC++..
+  FeatureBitset() = default;
+
+  FeatureBitset(const bitset<MAX_SUBTARGET_FEATURES>& B) : bitset(B) {}
+
+  FeatureBitset(std::initializer_list<unsigned> Init) {
+    for (auto I : Init)
+      set(I);
+  }
+
+  bool operator < (const FeatureBitset &Other) const {
+    for (unsigned I = 0, E = size(); I != E; ++I) {
+      bool LHS = test(I), RHS = Other.test(I);
+      if (LHS != RHS)
+        return LHS < RHS;
+    }
+    return false;
+  }
+};
+
+/// Class used to store the subtarget bits in the tables created by tablegen.
+/// The std::initializer_list constructor of FeatureBitset can't be done at
+/// compile time and requires a static constructor to run at startup.
+class FeatureBitArray {
+  std::array<uint64_t, MAX_SUBTARGET_WORDS> Bits;
+
+public:
+  constexpr FeatureBitArray(const std::array<uint64_t, MAX_SUBTARGET_WORDS> &B)
+      : Bits(B) {}
+
+  FeatureBitset getAsBitset() const {
+    FeatureBitset Result;
+
+    for (unsigned i = 0, e = Bits.size(); i != e; ++i)
+      Result |= FeatureBitset(Bits[i]) << (64 * i);
+
+    return Result;
+  }
+};
+
+//===----------------------------------------------------------------------===//
+
+/// Manages the enabling and disabling of subtarget specific features.
+///
+/// Features are encoded as a string of the form
+///   "+attr1,+attr2,-attr3,...,+attrN"
+/// A comma separates each feature from the next (all lowercase.)
+/// Each of the remaining features is prefixed with + or - indicating whether
+/// that feature should be enabled or disabled contrary to the cpu
+/// specification.
+class SubtargetFeatures {
+  std::vector<std::string> Features;    ///< Subtarget features as a vector
+
+public:
+  explicit SubtargetFeatures(StringRef Initial = "");
+
+  /// Returns features as a string.
+  std::string getString() const;
+
+  /// Adds Features.
+  void AddFeature(StringRef String, bool Enable = true);
+
+  /// Returns the vector of individual subtarget features.
+  const std::vector<std::string> &getFeatures() const { return Features; }
+
+  /// Prints feature string.
+  void print(raw_ostream &OS) const;
+
+  // Dumps feature info.
+  void dump() const;
+
+  /// Adds the default features for the specified target triple.
+  void getDefaultSubtargetFeatures(const Triple& Triple);
+
+  /// Determine if a feature has a flag; '+' or '-'
+  static bool hasFlag(StringRef Feature) {
+    assert(!Feature.empty() && "Empty string");
+    // Get first character
+    char Ch = Feature[0];
+    // Check if first character is '+' or '-' flag
+    return Ch == '+' || Ch =='-';
+  }
+
+  /// Return string stripped of flag.
+  static std::string StripFlag(StringRef Feature) {
+    return hasFlag(Feature) ? Feature.substr(1) : Feature;
+  }
+
+  /// Return true if enable flag; '+'.
+  static inline bool isEnabled(StringRef Feature) {
+    assert(!Feature.empty() && "Empty string");
+    // Get first character
+    char Ch = Feature[0];
+    // Check if first character is '+' for enabled
+    return Ch == '+';
+  }
+
+  /// Splits a string of comma separated items in to a vector of strings.
+  static void Split(std::vector<std::string> &V, StringRef S);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_MC_SUBTARGETFEATURE_H