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diff --git a/js/src/jit/loong64/MoveEmitter-loong64.h b/js/src/jit/loong64/MoveEmitter-loong64.h
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+++ b/js/src/jit/loong64/MoveEmitter-loong64.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_loong64_MoveEmitter_loong64_h
+#define jit_loong64_MoveEmitter_loong64_h
+
+#include "jit/MacroAssembler.h"
+#include "jit/MoveResolver.h"
+
+namespace js {
+namespace jit {
+
+class MoveEmitterLOONG64 {
+  void emitDoubleMove(const MoveOperand& from, const MoveOperand& to);
+  void breakCycle(const MoveOperand& from, const MoveOperand& to,
+                  MoveOp::Type type, uint32_t slot);
+  void completeCycle(const MoveOperand& from, const MoveOperand& to,
+                     MoveOp::Type type, uint32_t slot);
+
+ protected:
+  uint32_t inCycle_;
+  MacroAssembler& masm;
+
+  // Original stack push value.
+  uint32_t pushedAtStart_;
+
+  // These store stack offsets to spill locations, snapshotting
+  // codegen->framePushed_ at the time they were allocated. They are -1 if no
+  // stack space has been allocated for that particular spill.
+  int32_t pushedAtCycle_;
+  int32_t pushedAtSpill_;
+
+  // These are registers that are available for temporary use. They may be
+  // assigned InvalidReg. If no corresponding spill space has been assigned,
+  // then these registers do not need to be spilled.
+  Register spilledReg_;
+  FloatRegister spilledFloatReg_;
+
+  void assertDone();
+  Register tempReg();
+  FloatRegister tempFloatReg();
+  Address cycleSlot(uint32_t slot, uint32_t subslot = 0) const;
+  int32_t getAdjustedOffset(const MoveOperand& operand);
+  Address getAdjustedAddress(const MoveOperand& operand);
+
+  void emitMove(const MoveOperand& from, const MoveOperand& to);
+  void emitInt32Move(const MoveOperand& from, const MoveOperand& to);
+  void emitFloat32Move(const MoveOperand& from, const MoveOperand& to);
+  void emit(const MoveOp& move);
+
+ public:
+  MoveEmitterLOONG64(MacroAssembler& masm)
+      : inCycle_(0),
+        masm(masm),
+        pushedAtStart_(masm.framePushed()),
+        pushedAtCycle_(-1),
+        pushedAtSpill_(-1),
+        spilledReg_(InvalidReg),
+        spilledFloatReg_(InvalidFloatReg) {}
+
+  ~MoveEmitterLOONG64() { assertDone(); }
+
+  void emit(const MoveResolver& moves);
+  void finish();
+  void setScratchRegister(Register reg) {}
+};
+
+typedef MoveEmitterLOONG64 MoveEmitter;
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_loong64_MoveEmitter_loong64_h */