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diff --git a/js/src/jit/mips-shared/LIR-mips-shared.h b/js/src/jit/mips-shared/LIR-mips-shared.h
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+++ b/js/src/jit/mips-shared/LIR-mips-shared.h
@@ -0,0 +1,360 @@
+/* -*- 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_mips_shared_LIR_mips_shared_h
+#define jit_mips_shared_LIR_mips_shared_h
+
+namespace js {
+namespace jit {
+
+// Convert a 32-bit unsigned integer to a double.
+class LWasmUint32ToDouble : public LInstructionHelper<1, 1, 0> {
+ public:
+  LIR_HEADER(WasmUint32ToDouble)
+
+  LWasmUint32ToDouble(const LAllocation& input)
+      : LInstructionHelper(classOpcode) {
+    setOperand(0, input);
+  }
+};
+
+// Convert a 32-bit unsigned integer to a float32.
+class LWasmUint32ToFloat32 : public LInstructionHelper<1, 1, 0> {
+ public:
+  LIR_HEADER(WasmUint32ToFloat32)
+
+  LWasmUint32ToFloat32(const LAllocation& input)
+      : LInstructionHelper(classOpcode) {
+    setOperand(0, input);
+  }
+};
+
+class LDivI : public LBinaryMath<1> {
+ public:
+  LIR_HEADER(DivI);
+
+  LDivI(const LAllocation& lhs, const LAllocation& rhs, const LDefinition& temp)
+      : LBinaryMath(classOpcode) {
+    setOperand(0, lhs);
+    setOperand(1, rhs);
+    setTemp(0, temp);
+  }
+
+  MDiv* mir() const { return mir_->toDiv(); }
+};
+
+class LDivPowTwoI : public LInstructionHelper<1, 1, 1> {
+  const int32_t shift_;
+
+ public:
+  LIR_HEADER(DivPowTwoI)
+
+  LDivPowTwoI(const LAllocation& lhs, int32_t shift, const LDefinition& temp)
+      : LInstructionHelper(classOpcode), shift_(shift) {
+    setOperand(0, lhs);
+    setTemp(0, temp);
+  }
+
+  const LAllocation* numerator() { return getOperand(0); }
+  int32_t shift() const { return shift_; }
+  MDiv* mir() const { return mir_->toDiv(); }
+};
+
+class LModI : public LBinaryMath<1> {
+ public:
+  LIR_HEADER(ModI);
+
+  LModI(const LAllocation& lhs, const LAllocation& rhs,
+        const LDefinition& callTemp)
+      : LBinaryMath(classOpcode) {
+    setOperand(0, lhs);
+    setOperand(1, rhs);
+    setTemp(0, callTemp);
+  }
+
+  const LDefinition* callTemp() { return getTemp(0); }
+  MMod* mir() const { return mir_->toMod(); }
+};
+
+class LModPowTwoI : public LInstructionHelper<1, 1, 0> {
+  const int32_t shift_;
+
+ public:
+  LIR_HEADER(ModPowTwoI);
+
+  LModPowTwoI(const LAllocation& lhs, int32_t shift)
+      : LInstructionHelper(classOpcode), shift_(shift) {
+    setOperand(0, lhs);
+  }
+
+  int32_t shift() const { return shift_; }
+  MMod* mir() const { return mir_->toMod(); }
+};
+
+class LModMaskI : public LInstructionHelper<1, 1, 2> {
+  const int32_t shift_;
+
+ public:
+  LIR_HEADER(ModMaskI);
+
+  LModMaskI(const LAllocation& lhs, const LDefinition& temp0,
+            const LDefinition& temp1, int32_t shift)
+      : LInstructionHelper(classOpcode), shift_(shift) {
+    setOperand(0, lhs);
+    setTemp(0, temp0);
+    setTemp(1, temp1);
+  }
+
+  int32_t shift() const { return shift_; }
+  MMod* mir() const { return mir_->toMod(); }
+};
+
+// Takes a tableswitch with an integer to decide
+class LTableSwitch : public LInstructionHelper<0, 1, 2> {
+ public:
+  LIR_HEADER(TableSwitch);
+
+  LTableSwitch(const LAllocation& in, const LDefinition& inputCopy,
+               const LDefinition& jumpTablePointer, MTableSwitch* ins)
+      : LInstructionHelper(classOpcode) {
+    setOperand(0, in);
+    setTemp(0, inputCopy);
+    setTemp(1, jumpTablePointer);
+    setMir(ins);
+  }
+
+  MTableSwitch* mir() const { return mir_->toTableSwitch(); }
+  const LAllocation* index() { return getOperand(0); }
+  const LDefinition* tempInt() { return getTemp(0); }
+  // This is added to share the same CodeGenerator prefixes.
+  const LDefinition* tempPointer() { return getTemp(1); }
+};
+
+// Takes a tableswitch with an integer to decide
+class LTableSwitchV : public LInstructionHelper<0, BOX_PIECES, 3> {
+ public:
+  LIR_HEADER(TableSwitchV);
+
+  LTableSwitchV(const LBoxAllocation& input, const LDefinition& inputCopy,
+                const LDefinition& floatCopy,
+                const LDefinition& jumpTablePointer, MTableSwitch* ins)
+      : LInstructionHelper(classOpcode) {
+    setBoxOperand(InputValue, input);
+    setTemp(0, inputCopy);
+    setTemp(1, floatCopy);
+    setTemp(2, jumpTablePointer);
+    setMir(ins);
+  }
+
+  MTableSwitch* mir() const { return mir_->toTableSwitch(); }
+
+  static const size_t InputValue = 0;
+
+  const LDefinition* tempInt() { return getTemp(0); }
+  const LDefinition* tempFloat() { return getTemp(1); }
+  const LDefinition* tempPointer() { return getTemp(2); }
+};
+
+class LMulI : public LBinaryMath<0> {
+ public:
+  LIR_HEADER(MulI);
+
+  LMulI() : LBinaryMath(classOpcode) {}
+
+  MMul* mir() { return mir_->toMul(); }
+};
+
+class LUDivOrMod : public LBinaryMath<0> {
+ public:
+  LIR_HEADER(UDivOrMod);
+
+  LUDivOrMod() : LBinaryMath(classOpcode) {}
+
+  MBinaryArithInstruction* mir() const {
+    MOZ_ASSERT(mir_->isDiv() || mir_->isMod());
+    return static_cast<MBinaryArithInstruction*>(mir_);
+  }
+
+  bool canBeDivideByZero() const {
+    if (mir_->isMod()) {
+      return mir_->toMod()->canBeDivideByZero();
+    }
+    return mir_->toDiv()->canBeDivideByZero();
+  }
+
+  bool trapOnError() const {
+    if (mir_->isMod()) {
+      return mir_->toMod()->trapOnError();
+    }
+    return mir_->toDiv()->trapOnError();
+  }
+
+  wasm::BytecodeOffset bytecodeOffset() const {
+    MOZ_ASSERT(mir_->isDiv() || mir_->isMod());
+    if (mir_->isMod()) {
+      return mir_->toMod()->bytecodeOffset();
+    }
+    return mir_->toDiv()->bytecodeOffset();
+  }
+};
+
+namespace details {
+
+// Base class for the int64 and non-int64 variants.
+template <size_t NumDefs>
+class LWasmUnalignedLoadBase : public details::LWasmLoadBase<NumDefs, 2> {
+ public:
+  typedef LWasmLoadBase<NumDefs, 2> Base;
+
+  explicit LWasmUnalignedLoadBase(LNode::Opcode opcode, const LAllocation& ptr,
+                                  const LDefinition& valueHelper)
+      : Base(opcode, ptr, LAllocation()) {
+    Base::setTemp(0, LDefinition::BogusTemp());
+    Base::setTemp(1, valueHelper);
+  }
+
+  const LAllocation* ptr() { return Base::getOperand(0); }
+  const LDefinition* ptrCopy() { return Base::getTemp(0); }
+};
+
+}  // namespace details
+
+class LWasmUnalignedLoad : public details::LWasmUnalignedLoadBase<1> {
+ public:
+  LIR_HEADER(WasmUnalignedLoad);
+
+  explicit LWasmUnalignedLoad(const LAllocation& ptr,
+                              const LDefinition& valueHelper)
+      : LWasmUnalignedLoadBase(classOpcode, ptr, valueHelper) {}
+};
+
+class LWasmUnalignedLoadI64
+    : public details::LWasmUnalignedLoadBase<INT64_PIECES> {
+ public:
+  LIR_HEADER(WasmUnalignedLoadI64);
+
+  explicit LWasmUnalignedLoadI64(const LAllocation& ptr,
+                                 const LDefinition& valueHelper)
+      : LWasmUnalignedLoadBase(classOpcode, ptr, valueHelper) {}
+};
+
+namespace details {
+
+// Base class for the int64 and non-int64 variants.
+template <size_t NumOps>
+class LWasmUnalignedStoreBase : public LInstructionHelper<0, NumOps, 2> {
+ public:
+  typedef LInstructionHelper<0, NumOps, 2> Base;
+
+  static const size_t PtrIndex = 0;
+  static const size_t ValueIndex = 1;
+
+  LWasmUnalignedStoreBase(LNode::Opcode opcode, const LAllocation& ptr,
+                          const LDefinition& valueHelper)
+      : Base(opcode) {
+    Base::setOperand(0, ptr);
+    Base::setTemp(0, LDefinition::BogusTemp());
+    Base::setTemp(1, valueHelper);
+  }
+
+  MWasmStore* mir() const { return Base::mir_->toWasmStore(); }
+  const LAllocation* ptr() { return Base::getOperand(PtrIndex); }
+  const LDefinition* ptrCopy() { return Base::getTemp(0); }
+};
+
+}  // namespace details
+
+class LWasmUnalignedStore : public details::LWasmUnalignedStoreBase<2> {
+ public:
+  LIR_HEADER(WasmUnalignedStore);
+
+  LWasmUnalignedStore(const LAllocation& ptr, const LAllocation& value,
+                      const LDefinition& valueHelper)
+      : LWasmUnalignedStoreBase(classOpcode, ptr, valueHelper) {
+    setOperand(1, value);
+  }
+
+  const LAllocation* value() { return Base::getOperand(ValueIndex); }
+};
+
+class LWasmUnalignedStoreI64
+    : public details::LWasmUnalignedStoreBase<1 + INT64_PIECES> {
+ public:
+  LIR_HEADER(WasmUnalignedStoreI64);
+  LWasmUnalignedStoreI64(const LAllocation& ptr, const LInt64Allocation& value,
+                         const LDefinition& valueHelper)
+      : LWasmUnalignedStoreBase(classOpcode, ptr, valueHelper) {
+    setInt64Operand(1, value);
+  }
+
+  const LInt64Allocation value() { return getInt64Operand(ValueIndex); }
+};
+
+class LWasmCompareExchangeI64
+    : public LInstructionHelper<INT64_PIECES, 1 + INT64_PIECES + INT64_PIECES,
+                                0> {
+ public:
+  LIR_HEADER(WasmCompareExchangeI64);
+
+  LWasmCompareExchangeI64(const LAllocation& ptr,
+                          const LInt64Allocation& oldValue,
+                          const LInt64Allocation& newValue)
+      : LInstructionHelper(classOpcode) {
+    setOperand(0, ptr);
+    setInt64Operand(1, oldValue);
+    setInt64Operand(1 + INT64_PIECES, newValue);
+  }
+
+  const LAllocation* ptr() { return getOperand(0); }
+  const LInt64Allocation oldValue() { return getInt64Operand(1); }
+  const LInt64Allocation newValue() {
+    return getInt64Operand(1 + INT64_PIECES);
+  }
+  const MWasmCompareExchangeHeap* mir() const {
+    return mir_->toWasmCompareExchangeHeap();
+  }
+};
+
+class LWasmAtomicExchangeI64
+    : public LInstructionHelper<INT64_PIECES, 1 + INT64_PIECES, 0> {
+ public:
+  LIR_HEADER(WasmAtomicExchangeI64);
+
+  LWasmAtomicExchangeI64(const LAllocation& ptr, const LInt64Allocation& value)
+      : LInstructionHelper(classOpcode) {
+    setOperand(0, ptr);
+    setInt64Operand(1, value);
+  }
+
+  const LAllocation* ptr() { return getOperand(0); }
+  const LInt64Allocation value() { return getInt64Operand(1); }
+  const MWasmAtomicExchangeHeap* mir() const {
+    return mir_->toWasmAtomicExchangeHeap();
+  }
+};
+
+class LWasmAtomicBinopI64
+    : public LInstructionHelper<INT64_PIECES, 1 + INT64_PIECES, 2> {
+ public:
+  LIR_HEADER(WasmAtomicBinopI64);
+
+  LWasmAtomicBinopI64(const LAllocation& ptr, const LInt64Allocation& value)
+      : LInstructionHelper(classOpcode) {
+    setOperand(0, ptr);
+    setInt64Operand(1, value);
+  }
+
+  const LAllocation* ptr() { return getOperand(0); }
+  const LInt64Allocation value() { return getInt64Operand(1); }
+  const MWasmAtomicBinopHeap* mir() const {
+    return mir_->toWasmAtomicBinopHeap();
+  }
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_mips_shared_LIR_mips_shared_h */