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diff --git a/llvm/lib/Target/ARM/ARMLegalizerInfo.h b/llvm/lib/Target/ARM/ARMLegalizerInfo.h
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+++ b/llvm/lib/Target/ARM/ARMLegalizerInfo.h
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+//===- ARMLegalizerInfo ------------------------------------------*- 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
+/// This file declares the targeting of the Machinelegalizer class for ARM.
+/// \todo This should be generated by TableGen.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
+#define LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
+
+#include "llvm/ADT/IndexedMap.h"
+#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
+#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
+#include "llvm/CodeGen/RuntimeLibcalls.h"
+#include "llvm/IR/Instructions.h"
+
+namespace llvm {
+
+class ARMSubtarget;
+
+/// This class provides the information for the target register banks.
+class ARMLegalizerInfo : public LegalizerInfo {
+public:
+  ARMLegalizerInfo(const ARMSubtarget &ST);
+
+  bool legalizeCustom(MachineInstr &MI, MachineRegisterInfo &MRI,
+                      MachineIRBuilder &MIRBuilder,
+                      GISelChangeObserver &Observer) const override;
+
+private:
+  void setFCmpLibcallsGNU();
+  void setFCmpLibcallsAEABI();
+
+  struct FCmpLibcallInfo {
+    // Which libcall this is.
+    RTLIB::Libcall LibcallID;
+
+    // The predicate to be used when comparing the value returned by the
+    // function with a relevant constant (currently hard-coded to zero). This is
+    // necessary because often the libcall will return e.g. a value greater than
+    // 0 to represent 'true' and anything negative to represent 'false', or
+    // maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is
+    // needed, this should be CmpInst::BAD_ICMP_PREDICATE.
+    CmpInst::Predicate Predicate;
+  };
+  using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>;
+
+  // Map from each FCmp predicate to the corresponding libcall infos. A FCmp
+  // instruction may be lowered to one or two libcalls, which is why we need a
+  // list. If two libcalls are needed, their results will be OR'ed.
+  using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>;
+
+  FCmpLibcallsMapTy FCmp32Libcalls;
+  FCmpLibcallsMapTy FCmp64Libcalls;
+
+  // Get the libcall(s) corresponding to \p Predicate for operands of \p Size
+  // bits.
+  FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const;
+};
+} // End llvm namespace.
+#endif