diff -r 000000000000 -r 6474c204b198 js/src/jit/shared/LIR-x86-shared.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit/shared/LIR-x86-shared.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,332 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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_shared_LIR_x86_shared_h
+#define jit_shared_LIR_x86_shared_h
+
+namespace js {
+namespace jit {
+
+class LDivI : public LBinaryMath<1>
+{
+  public:
+    LIR_HEADER(DivI)
+
+    LDivI(const LAllocation &lhs, const LAllocation &rhs, const LDefinition &temp) {
+        setOperand(0, lhs);
+        setOperand(1, rhs);
+        setTemp(0, temp);
+    }
+
+    const char *extraName() const {
+        if (mir()->isTruncated()) {
+            if (mir()->canBeNegativeZero()) {
+                return mir()->canBeNegativeOverflow()
+                       ? "Truncate_NegativeZero_NegativeOverflow"
+                       : "Truncate_NegativeZero";
+            }
+            return mir()->canBeNegativeOverflow() ? "Truncate_NegativeOverflow" : "Truncate";
+        }
+        if (mir()->canBeNegativeZero())
+            return mir()->canBeNegativeOverflow() ? "NegativeZero_NegativeOverflow" : "NegativeZero";
+        return mir()->canBeNegativeOverflow() ? "NegativeOverflow" : nullptr;
+    }
+
+    const LDefinition *remainder() {
+        return getTemp(0);
+    }
+    MDiv *mir() const {
+        return mir_->toDiv();
+    }
+};
+
+// Signed division by a power-of-two constant.
+class LDivPowTwoI : public LBinaryMath<0>
+{
+    const int32_t shift_;
+    const bool negativeDivisor_;
+
+  public:
+    LIR_HEADER(DivPowTwoI)
+
+    LDivPowTwoI(const LAllocation &lhs, const LAllocation &lhsCopy, int32_t shift, bool negativeDivisor)
+      : shift_(shift), negativeDivisor_(negativeDivisor)
+    {
+        setOperand(0, lhs);
+        setOperand(1, lhsCopy);
+    }
+
+    const LAllocation *numerator() {
+        return getOperand(0);
+    }
+    const LAllocation *numeratorCopy() {
+        return getOperand(1);
+    }
+    int32_t shift() const {
+        return shift_;
+    }
+    bool negativeDivisor() const {
+        return negativeDivisor_;
+    }
+    MDiv *mir() const {
+        return mir_->toDiv();
+    }
+};
+
+class LDivOrModConstantI : public LInstructionHelper<1, 1, 1>
+{
+    const int32_t denominator_;
+
+  public:
+    LIR_HEADER(DivOrModConstantI)
+
+    LDivOrModConstantI(const LAllocation &lhs, int32_t denominator, const LDefinition& temp)
+    : denominator_(denominator)
+    {
+        setOperand(0, lhs);
+        setTemp(0, temp);
+    }
+
+    const LAllocation *numerator() {
+        return getOperand(0);
+    }
+    int32_t denominator() const {
+        return denominator_;
+    }
+    MBinaryArithInstruction *mir() const {
+        JS_ASSERT(mir_->isDiv() || mir_->isMod());
+        return static_cast<MBinaryArithInstruction *>(mir_);
+    }
+    bool canBeNegativeDividend() const {
+        if (mir_->isMod())
+            return mir_->toMod()->canBeNegativeDividend();
+        return mir_->toDiv()->canBeNegativeDividend();
+    }
+};
+
+class LModI : public LBinaryMath<1>
+{
+  public:
+    LIR_HEADER(ModI)
+
+    LModI(const LAllocation &lhs, const LAllocation &rhs, const LDefinition &temp) {
+        setOperand(0, lhs);
+        setOperand(1, rhs);
+        setTemp(0, temp);
+    }
+
+    const char *extraName() const {
+        return mir()->isTruncated() ? "Truncated" : nullptr;
+    }
+
+    const LDefinition *remainder() {
+        return getDef(0);
+    }
+    MMod *mir() const {
+        return mir_->toMod();
+    }
+};
+
+// This class performs a simple x86 'div', yielding either a quotient or remainder depending on
+// whether this instruction is defined to output eax (quotient) or edx (remainder).
+class LUDivOrMod : public LBinaryMath<1>
+{
+  public:
+    LIR_HEADER(UDivOrMod);
+
+    LUDivOrMod(const LAllocation &lhs, const LAllocation &rhs, const LDefinition &temp) {
+        setOperand(0, lhs);
+        setOperand(1, rhs);
+        setTemp(0, temp);
+    }
+
+    const LDefinition *remainder() {
+        return getTemp(0);
+    }
+
+    const char *extraName() const {
+        return mir()->isTruncated() ? "Truncated" : nullptr;
+    }
+
+    MBinaryArithInstruction *mir() const {
+        JS_ASSERT(mir_->isDiv() || mir_->isMod());
+        return static_cast<MBinaryArithInstruction *>(mir_);
+    }
+
+    bool canBeDivideByZero() const {
+        if (mir_->isMod())
+            return mir_->toMod()->canBeDivideByZero();
+        return mir_->toDiv()->canBeDivideByZero();
+    }
+};
+
+class LModPowTwoI : public LInstructionHelper<1,1,0>
+{
+    const int32_t shift_;
+
+  public:
+    LIR_HEADER(ModPowTwoI)
+
+    LModPowTwoI(const LAllocation &lhs, int32_t shift)
+      : shift_(shift)
+    {
+        setOperand(0, lhs);
+    }
+
+    int32_t shift() const {
+        return shift_;
+    }
+    const LDefinition *remainder() {
+        return getDef(0);
+    }
+    MMod *mir() const {
+        return mir_->toMod();
+    }
+};
+
+// Double raised to a half power.
+class LPowHalfD : public LInstructionHelper<1, 1, 0>
+{
+  public:
+    LIR_HEADER(PowHalfD)
+    LPowHalfD(const LAllocation &input) {
+        setOperand(0, input);
+    }
+
+    const LAllocation *input() {
+        return getOperand(0);
+    }
+    const LDefinition *output() {
+        return getDef(0);
+    }
+    MPowHalf *mir() const {
+        return mir_->toPowHalf();
+    }
+};
+
+// 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)
+    {
+        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);
+    }
+    const LDefinition *tempPointer() {
+        return getTemp(1);
+    }
+};
+
+// Takes a tableswitch with a value to decide
+class LTableSwitchV : public LInstructionHelper<0, BOX_PIECES, 3>
+{
+  public:
+    LIR_HEADER(TableSwitchV)
+
+    LTableSwitchV(const LDefinition &inputCopy, const LDefinition &floatCopy,
+                  const LDefinition &jumpTablePointer, MTableSwitch *ins)
+    {
+        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 LGuardShape : public LInstructionHelper<0, 1, 0>
+{
+  public:
+    LIR_HEADER(GuardShape)
+
+    LGuardShape(const LAllocation &in) {
+        setOperand(0, in);
+    }
+    const MGuardShape *mir() const {
+        return mir_->toGuardShape();
+    }
+};
+
+class LGuardObjectType : public LInstructionHelper<0, 1, 0>
+{
+  public:
+    LIR_HEADER(GuardObjectType)
+
+    LGuardObjectType(const LAllocation &in) {
+        setOperand(0, in);
+    }
+    const MGuardObjectType *mir() const {
+        return mir_->toGuardObjectType();
+    }
+};
+
+class LInterruptCheck : public LInstructionHelper<0, 0, 0>
+{
+  public:
+    LIR_HEADER(InterruptCheck)
+};
+
+class LMulI : public LBinaryMath<0, 1>
+{
+  public:
+    LIR_HEADER(MulI)
+
+    LMulI(const LAllocation &lhs, const LAllocation &rhs, const LAllocation &lhsCopy) {
+        setOperand(0, lhs);
+        setOperand(1, rhs);
+        setOperand(2, lhsCopy);
+    }
+
+    const char *extraName() const {
+        return (mir()->mode() == MMul::Integer)
+               ? "Integer"
+               : (mir()->canBeNegativeZero() ? "CanBeNegativeZero" : nullptr);
+    }
+
+    MMul *mir() const {
+        return mir_->toMul();
+    }
+    const LAllocation *lhsCopy() {
+        return this->getOperand(2);
+    }
+};
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_shared_LIR_x86_shared_h */