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diff --git a/js/src/jit/x86/Lowering-x86.h b/js/src/jit/x86/Lowering-x86.h
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+++ b/js/src/jit/x86/Lowering-x86.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_x86_Lowering_x86_h
+#define jit_x86_Lowering_x86_h
+
+#include "jit/x86-shared/Lowering-x86-shared.h"
+
+namespace js {
+namespace jit {
+
+class LIRGeneratorX86 : public LIRGeneratorX86Shared {
+ protected:
+  LIRGeneratorX86(MIRGenerator* gen, MIRGraph& graph, LIRGraph& lirGraph)
+      : LIRGeneratorX86Shared(gen, graph, lirGraph) {}
+
+  // Returns a box allocation with type set to reg1 and payload set to reg2.
+  LBoxAllocation useBoxFixed(MDefinition* mir, Register reg1, Register reg2,
+                             bool useAtStart = false);
+
+  // It's a trap! On x86, the 1-byte store can only use one of
+  // {al,bl,cl,dl,ah,bh,ch,dh}. That means if the register allocator
+  // gives us one of {edi,esi,ebp,esp}, we're out of luck. (The formatter
+  // will assert on us.) Ideally, we'd just ask the register allocator to
+  // give us one of {al,bl,cl,dl}. For now, just useFixed(al).
+  LAllocation useByteOpRegister(MDefinition* mir);
+  LAllocation useByteOpRegisterAtStart(MDefinition* mir);
+  LAllocation useByteOpRegisterOrNonDoubleConstant(MDefinition* mir);
+  LDefinition tempByteOpRegister();
+
+  inline LDefinition tempToUnbox() { return LDefinition::BogusTemp(); }
+
+  bool needTempForPostBarrier() { return true; }
+
+  void lowerUntypedPhiInput(MPhi* phi, uint32_t inputPosition, LBlock* block,
+                            size_t lirIndex);
+
+  void lowerInt64PhiInput(MPhi* phi, uint32_t inputPosition, LBlock* block,
+                          size_t lirIndex);
+  void defineInt64Phi(MPhi* phi, size_t lirIndex);
+
+  void lowerForALUInt64(LInstructionHelper<INT64_PIECES, INT64_PIECES, 0>* ins,
+                        MDefinition* mir, MDefinition* input);
+  void lowerForALUInt64(
+      LInstructionHelper<INT64_PIECES, 2 * INT64_PIECES, 0>* ins,
+      MDefinition* mir, MDefinition* lhs, MDefinition* rhs);
+  void lowerForMulInt64(LMulI64* ins, MMul* mir, MDefinition* lhs,
+                        MDefinition* rhs);
+
+  void lowerBuiltinInt64ToFloatingPoint(MBuiltinInt64ToFloatingPoint* ins);
+  void lowerWasmBuiltinTruncateToInt64(MWasmBuiltinTruncateToInt64* ins);
+  void lowerDivI64(MDiv* div);
+  void lowerWasmBuiltinDivI64(MWasmBuiltinDivI64* div);
+  void lowerModI64(MMod* mod);
+  void lowerWasmBuiltinModI64(MWasmBuiltinModI64* mod);
+  void lowerUDivI64(MDiv* div);
+  void lowerUModI64(MMod* mod);
+
+  void lowerBigIntDiv(MBigIntDiv* ins);
+  void lowerBigIntMod(MBigIntMod* ins);
+
+  void lowerAtomicLoad64(MLoadUnboxedScalar* ins);
+  void lowerAtomicStore64(MStoreUnboxedScalar* ins);
+
+  void lowerPhi(MPhi* phi);
+
+ public:
+  static bool allowTypedElementHoleCheck() { return true; }
+};
+
+typedef LIRGeneratorX86 LIRGeneratorSpecific;
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_x86_Lowering_x86_h */