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diff --git a/llvm/lib/Target/ARM/ARMHazardRecognizer.h b/llvm/lib/Target/ARM/ARMHazardRecognizer.h
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+++ b/llvm/lib/Target/ARM/ARMHazardRecognizer.h
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+//===-- ARMHazardRecognizer.h - ARM Hazard Recognizers ----------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines hazard recognizers for scheduling ARM functions.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
+#define LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
+
+#include "llvm/CodeGen/ScoreboardHazardRecognizer.h"
+
+namespace llvm {
+
+class ARMBaseInstrInfo;
+class ARMBaseRegisterInfo;
+class ARMSubtarget;
+class MachineInstr;
+
+/// ARMHazardRecognizer handles special constraints that are not expressed in
+/// the scheduling itinerary. This is only used during postRA scheduling. The
+/// ARM preRA scheduler uses an unspecialized instance of the
+/// ScoreboardHazardRecognizer.
+class ARMHazardRecognizer : public ScoreboardHazardRecognizer {
+  MachineInstr *LastMI;
+  unsigned FpMLxStalls;
+
+public:
+  ARMHazardRecognizer(const InstrItineraryData *ItinData,
+                      const ScheduleDAG *DAG)
+    : ScoreboardHazardRecognizer(ItinData, DAG, "post-RA-sched"),
+      LastMI(nullptr) {}
+
+  HazardType getHazardType(SUnit *SU, int Stalls) override;
+  void Reset() override;
+  void EmitInstruction(SUnit *SU) override;
+  void AdvanceCycle() override;
+  void RecedeCycle() override;
+};
+
+} // end namespace llvm
+
+#endif