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diff --git a/contrib/llvm-project/llvm/lib/Target/Hexagon/HexagonBitTracker.h b/contrib/llvm-project/llvm/lib/Target/Hexagon/HexagonBitTracker.h
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index 000000000000..02607d50f686
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+++ b/contrib/llvm-project/llvm/lib/Target/Hexagon/HexagonBitTracker.h
@@ -0,0 +1,77 @@
+//===- HexagonBitTracker.h --------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONBITTRACKER_H
+#define LLVM_LIB_TARGET_HEXAGON_HEXAGONBITTRACKER_H
+
+#include "BitTracker.h"
+#include "llvm/ADT/DenseMap.h"
+#include <cstdint>
+
+namespace llvm {
+
+class HexagonInstrInfo;
+class HexagonRegisterInfo;
+class MachineFrameInfo;
+class MachineFunction;
+class MachineInstr;
+class MachineRegisterInfo;
+
+struct HexagonEvaluator : public BitTracker::MachineEvaluator {
+  using CellMapType = BitTracker::CellMapType;
+  using RegisterRef = BitTracker::RegisterRef;
+  using RegisterCell = BitTracker::RegisterCell;
+  using BranchTargetList = BitTracker::BranchTargetList;
+
+  HexagonEvaluator(const HexagonRegisterInfo &tri, MachineRegisterInfo &mri,
+                   const HexagonInstrInfo &tii, MachineFunction &mf);
+
+  bool evaluate(const MachineInstr &MI, const CellMapType &Inputs,
+                CellMapType &Outputs) const override;
+  bool evaluate(const MachineInstr &BI, const CellMapType &Inputs,
+                BranchTargetList &Targets, bool &FallsThru) const override;
+
+  BitTracker::BitMask mask(unsigned Reg, unsigned Sub) const override;
+
+  uint16_t getPhysRegBitWidth(unsigned Reg) const override;
+
+  const TargetRegisterClass &composeWithSubRegIndex(
+        const TargetRegisterClass &RC, unsigned Idx) const override;
+
+  MachineFunction &MF;
+  MachineFrameInfo &MFI;
+  const HexagonInstrInfo &TII;
+
+private:
+  unsigned getUniqueDefVReg(const MachineInstr &MI) const;
+  bool evaluateLoad(const MachineInstr &MI, const CellMapType &Inputs,
+                    CellMapType &Outputs) const;
+  bool evaluateFormalCopy(const MachineInstr &MI, const CellMapType &Inputs,
+                          CellMapType &Outputs) const;
+
+  unsigned getNextPhysReg(unsigned PReg, unsigned Width) const;
+  unsigned getVirtRegFor(unsigned PReg) const;
+
+  // Type of formal parameter extension.
+  struct ExtType {
+    enum { SExt, ZExt };
+
+    ExtType() = default;
+    ExtType(char t, uint16_t w) : Type(t), Width(w) {}
+
+    char Type = 0;
+    uint16_t Width = 0;
+  };
+  // Map VR -> extension type.
+  using RegExtMap = DenseMap<unsigned, ExtType>;
+  RegExtMap VRX;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_TARGET_HEXAGON_HEXAGONBITTRACKER_H