lithium-mips.h

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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef V8_MIPS_LITHIUM_MIPS_H_
#define V8_MIPS_LITHIUM_MIPS_H_
 
#include "src/hydrogen.h"
#include "src/lithium.h"
#include "src/lithium-allocator.h"
#include "src/safepoint-table.h"
#include "src/utils.h"
 
namespace v8 {
namespace internal {
 
// Forward declarations.
class LCodeGen;
 
#define LITHIUM_CONCRETE_INSTRUCTION_LIST(V) \
  V(AccessArgumentsAt)                       \
  V(AddI)                                    \
  V(Allocate)                                \
  V(AllocateBlockContext)                    \
  V(ApplyArguments)                          \
  V(ArgumentsElements)                       \
  V(ArgumentsLength)                         \
  V(ArithmeticD)                             \
  V(ArithmeticT)                             \
  V(BitI)                                    \
  V(BoundsCheck)                             \
  V(Branch)                                  \
  V(CallJSFunction)                          \
  V(CallWithDescriptor)                      \
  V(CallFunction)                            \
  V(CallNew)                                 \
  V(CallNewArray)                            \
  V(CallRuntime)                             \
  V(CallStub)                                \
  V(CheckInstanceType)                       \
  V(CheckMaps)                               \
  V(CheckMapValue)                           \
  V(CheckNonSmi)                             \
  V(CheckSmi)                                \
  V(CheckValue)                              \
  V(ClampDToUint8)                           \
  V(ClampIToUint8)                           \
  V(ClampTToUint8)                           \
  V(ClassOfTestAndBranch)                    \
  V(CompareMinusZeroAndBranch)               \
  V(CompareNumericAndBranch)                 \
  V(CmpObjectEqAndBranch)                    \
  V(CmpHoleAndBranch)                        \
  V(CmpMapAndBranch)                         \
  V(CmpT)                                    \
  V(ConstantD)                               \
  V(ConstantE)                               \
  V(ConstantI)                               \
  V(ConstantS)                               \
  V(ConstantT)                               \
  V(ConstructDouble)                         \
  V(Context)                                 \
  V(DateField)                               \
  V(DebugBreak)                              \
  V(DeclareGlobals)                          \
  V(Deoptimize)                              \
  V(DivByConstI)                             \
  V(DivByPowerOf2I)                          \
  V(DivI)                                    \
  V(DoubleToI)                               \
  V(DoubleBits)                              \
  V(DoubleToSmi)                             \
  V(Drop)                                    \
  V(Dummy)                                   \
  V(DummyUse)                                \
  V(FlooringDivByConstI)                     \
  V(FlooringDivByPowerOf2I)                  \
  V(FlooringDivI)                            \
  V(ForInCacheArray)                         \
  V(ForInPrepareMap)                         \
  V(FunctionLiteral)                         \
  V(GetCachedArrayIndex)                     \
  V(Goto)                                    \
  V(HasCachedArrayIndexAndBranch)            \
  V(HasInstanceTypeAndBranch)                \
  V(InnerAllocatedObject)                    \
  V(InstanceOf)                              \
  V(InstanceOfKnownGlobal)                   \
  V(InstructionGap)                          \
  V(Integer32ToDouble)                       \
  V(InvokeFunction)                          \
  V(IsConstructCallAndBranch)                \
  V(IsObjectAndBranch)                       \
  V(IsStringAndBranch)                       \
  V(IsSmiAndBranch)                          \
  V(IsUndetectableAndBranch)                 \
  V(Label)                                   \
  V(LazyBailout)                             \
  V(LoadContextSlot)                         \
  V(LoadRoot)                                \
  V(LoadFieldByIndex)                        \
  V(LoadFunctionPrototype)                   \
  V(LoadGlobalCell)                          \
  V(LoadGlobalGeneric)                       \
  V(LoadKeyed)                               \
  V(LoadKeyedGeneric)                        \
  V(LoadNamedField)                          \
  V(LoadNamedGeneric)                        \
  V(MapEnumLength)                           \
  V(MathAbs)                                 \
  V(MathExp)                                 \
  V(MathClz32)                               \
  V(MathFloor)                               \
  V(MathFround)                              \
  V(MathLog)                                 \
  V(MathMinMax)                              \
  V(MathPowHalf)                             \
  V(MathRound)                               \
  V(MathSqrt)                                \
  V(ModByConstI)                             \
  V(ModByPowerOf2I)                          \
  V(ModI)                                    \
  V(MulI)                                    \
  V(MultiplyAddD)                            \
  V(NumberTagD)                              \
  V(NumberTagI)                              \
  V(NumberTagU)                              \
  V(NumberUntagD)                            \
  V(OsrEntry)                                \
  V(Parameter)                               \
  V(Power)                                   \
  V(PushArgument)                            \
  V(RegExpLiteral)                           \
  V(Return)                                  \
  V(SeqStringGetChar)                        \
  V(SeqStringSetChar)                        \
  V(ShiftI)                                  \
  V(SmiTag)                                  \
  V(SmiUntag)                                \
  V(StackCheck)                              \
  V(StoreCodeEntry)                          \
  V(StoreContextSlot)                        \
  V(StoreFrameContext)                       \
  V(StoreGlobalCell)                         \
  V(StoreKeyed)                              \
  V(StoreKeyedGeneric)                       \
  V(StoreNamedField)                         \
  V(StoreNamedGeneric)                       \
  V(StringAdd)                               \
  V(StringCharCodeAt)                        \
  V(StringCharFromCode)                      \
  V(StringCompareAndBranch)                  \
  V(SubI)                                    \
  V(TaggedToI)                               \
  V(TailCallThroughMegamorphicCache)         \
  V(ThisFunction)                            \
  V(ToFastProperties)                        \
  V(TransitionElementsKind)                  \
  V(TrapAllocationMemento)                   \
  V(Typeof)                                  \
  V(TypeofIsAndBranch)                       \
  V(Uint32ToDouble)                          \
  V(UnknownOSRValue)                         \
  V(WrapReceiver)
 
#define DECLARE_CONCRETE_INSTRUCTION(type, mnemonic)                        \
  virtual Opcode opcode() const FINAL OVERRIDE {                      \
    return LInstruction::k##type;                                           \
  }                                                                         \
  virtual void CompileToNative(LCodeGen* generator) FINAL OVERRIDE;   \
  virtual const char* Mnemonic() const FINAL OVERRIDE {               \
    return mnemonic;                                                        \
  }                                                                         \
  static L##type* cast(LInstruction* instr) {                               \
    DCHECK(instr->Is##type());                                              \
    return reinterpret_cast<L##type*>(instr);                               \
  }
 
 
#define DECLARE_HYDROGEN_ACCESSOR(type)     \
  H##type* hydrogen() const {               \
    return H##type::cast(hydrogen_value()); \
  }
 
 
class LInstruction : public ZoneObject {
 public:
  LInstruction()
      : environment_(NULL),
        hydrogen_value_(NULL),
        bit_field_(IsCallBits::encode(false)) {
  }
 
  virtual ~LInstruction() {}
 
  virtual void CompileToNative(LCodeGen* generator) = 0;
  virtual const char* Mnemonic() const = 0;
  virtual void PrintTo(StringStream* stream);
  virtual void PrintDataTo(StringStream* stream);
  virtual void PrintOutputOperandTo(StringStream* stream);
 
  enum Opcode {
    // Declare a unique enum value for each instruction.
#define DECLARE_OPCODE(type) k##type,
    LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_OPCODE)
    kNumberOfInstructions
#undef DECLARE_OPCODE
  };
 
  virtual Opcode opcode() const = 0;
 
  // Declare non-virtual type testers for all leaf IR classes.
#define DECLARE_PREDICATE(type) \
  bool Is##type() const { return opcode() == k##type; }
  LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_PREDICATE)
#undef DECLARE_PREDICATE
 
  // Declare virtual predicates for instructions that don't have
  // an opcode.
  virtual bool IsGap() const { return false; }
 
  virtual bool IsControl() const { return false; }
 
  // Try deleting this instruction if possible.
  virtual bool TryDelete() { return false; }
 
  void set_environment(LEnvironment* env) { environment_ = env; }
  LEnvironment* environment() const { return environment_; }
  bool HasEnvironment() const { return environment_ != NULL; }
 
  void set_pointer_map(LPointerMap* p) { pointer_map_.set(p); }
  LPointerMap* pointer_map() const { return pointer_map_.get(); }
  bool HasPointerMap() const { return pointer_map_.is_set(); }
 
  void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
  HValue* hydrogen_value() const { return hydrogen_value_; }
 
  virtual void SetDeferredLazyDeoptimizationEnvironment(LEnvironment* env) { }
 
  void MarkAsCall() { bit_field_ = IsCallBits::update(bit_field_, true); }
  bool IsCall() const { return IsCallBits::decode(bit_field_); }
 
  // Interface to the register allocator and iterators.
  bool ClobbersTemps() const { return IsCall(); }
  bool ClobbersRegisters() const { return IsCall(); }
  virtual bool ClobbersDoubleRegisters(Isolate* isolate) const {
    return IsCall();
  }
 
  // Interface to the register allocator and iterators.
  bool IsMarkedAsCall() const { return IsCall(); }
 
  virtual bool HasResult() const = 0;
  virtual LOperand* result() const = 0;
 
  LOperand* FirstInput() { return InputAt(0); }
  LOperand* Output() { return HasResult() ? result() : NULL; }
 
  virtual bool HasInterestingComment(LCodeGen* gen) const { return true; }
 
#ifdef DEBUG
  void VerifyCall();
#endif
 
  virtual int InputCount() = 0;
  virtual LOperand* InputAt(int i) = 0;
 
 private:
  // Iterator interface.
  friend class InputIterator;
 
  friend class TempIterator;
  virtual int TempCount() = 0;
  virtual LOperand* TempAt(int i) = 0;
 
  class IsCallBits: public BitField<bool, 0, 1> {};
 
  LEnvironment* environment_;
  SetOncePointer<LPointerMap> pointer_map_;
  HValue* hydrogen_value_;
  int bit_field_;
};
 
 
// R = number of result operands (0 or 1).
template<int R>
class LTemplateResultInstruction : public LInstruction {
 public:
  // Allow 0 or 1 output operands.
  STATIC_ASSERT(R == 0 || R == 1);
  virtual bool HasResult() const FINAL OVERRIDE {
    return R != 0 && result() != NULL;
  }
  void set_result(LOperand* operand) { results_[0] = operand; }
  LOperand* result() const { return results_[0]; }
 
 protected:
  EmbeddedContainer<LOperand*, R> results_;
};
 
 
// R = number of result operands (0 or 1).
// I = number of input operands.
// T = number of temporary operands.
template<int R, int I, int T>
class LTemplateInstruction : public LTemplateResultInstruction<R> {
 protected:
  EmbeddedContainer<LOperand*, I> inputs_;
  EmbeddedContainer<LOperand*, T> temps_;
 
 private:
  // Iterator support.
  virtual int InputCount() FINAL OVERRIDE { return I; }
  virtual LOperand* InputAt(int i) FINAL OVERRIDE { return inputs_[i]; }
 
  virtual int TempCount() FINAL OVERRIDE { return T; }
  virtual LOperand* TempAt(int i) FINAL OVERRIDE { return temps_[i]; }
};
 
 
class LGap : public LTemplateInstruction<0, 0, 0> {
 public:
  explicit LGap(HBasicBlock* block)
      : block_(block) {
    parallel_moves_[BEFORE] = NULL;
    parallel_moves_[START] = NULL;
    parallel_moves_[END] = NULL;
    parallel_moves_[AFTER] = NULL;
  }
 
  // Can't use the DECLARE-macro here because of sub-classes.
  virtual bool IsGap() const FINAL OVERRIDE { return true; }
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
  static LGap* cast(LInstruction* instr) {
    DCHECK(instr->IsGap());
    return reinterpret_cast<LGap*>(instr);
  }
 
  bool IsRedundant() const;
 
  HBasicBlock* block() const { return block_; }
 
  enum InnerPosition {
    BEFORE,
    START,
    END,
    AFTER,
    FIRST_INNER_POSITION = BEFORE,
    LAST_INNER_POSITION = AFTER
  };
 
  LParallelMove* GetOrCreateParallelMove(InnerPosition pos, Zone* zone)  {
    if (parallel_moves_[pos] == NULL) {
      parallel_moves_[pos] = new(zone) LParallelMove(zone);
    }
    return parallel_moves_[pos];
  }
 
  LParallelMove* GetParallelMove(InnerPosition pos)  {
    return parallel_moves_[pos];
  }
 
 private:
  LParallelMove* parallel_moves_[LAST_INNER_POSITION + 1];
  HBasicBlock* block_;
};
 
 
class LInstructionGap FINAL : public LGap {
 public:
  explicit LInstructionGap(HBasicBlock* block) : LGap(block) { }
 
  virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE {
    return !IsRedundant();
  }
 
  DECLARE_CONCRETE_INSTRUCTION(InstructionGap, "gap")
};
 
 
class LGoto FINAL : public LTemplateInstruction<0, 0, 0> {
 public:
  explicit LGoto(HBasicBlock* block) : block_(block) { }
 
  virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE;
  DECLARE_CONCRETE_INSTRUCTION(Goto, "goto")
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
  virtual bool IsControl() const OVERRIDE { return true; }
 
  int block_id() const { return block_->block_id(); }
 
 private:
  HBasicBlock* block_;
};
 
 
class LLazyBailout FINAL : public LTemplateInstruction<0, 0, 0> {
 public:
  LLazyBailout() : gap_instructions_size_(0) { }
 
  DECLARE_CONCRETE_INSTRUCTION(LazyBailout, "lazy-bailout")
 
  void set_gap_instructions_size(int gap_instructions_size) {
    gap_instructions_size_ = gap_instructions_size;
  }
  int gap_instructions_size() { return gap_instructions_size_; }
 
 private:
  int gap_instructions_size_;
};
 
 
class LDummy FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  LDummy() {}
  DECLARE_CONCRETE_INSTRUCTION(Dummy, "dummy")
};
 
 
class LDummyUse FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LDummyUse(LOperand* value) {
    inputs_[0] = value;
  }
  DECLARE_CONCRETE_INSTRUCTION(DummyUse, "dummy-use")
};
 
 
class LDeoptimize FINAL : public LTemplateInstruction<0, 0, 0> {
 public:
  virtual bool IsControl() const OVERRIDE { return true; }
  DECLARE_CONCRETE_INSTRUCTION(Deoptimize, "deoptimize")
  DECLARE_HYDROGEN_ACCESSOR(Deoptimize)
};
 
 
class LLabel FINAL : public LGap {
 public:
  explicit LLabel(HBasicBlock* block)
      : LGap(block), replacement_(NULL) { }
 
  virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE {
    return false;
  }
  DECLARE_CONCRETE_INSTRUCTION(Label, "label")
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  int block_id() const { return block()->block_id(); }
  bool is_loop_header() const { return block()->IsLoopHeader(); }
  bool is_osr_entry() const { return block()->is_osr_entry(); }
  Label* label() { return &label_; }
  LLabel* replacement() const { return replacement_; }
  void set_replacement(LLabel* label) { replacement_ = label; }
  bool HasReplacement() const { return replacement_ != NULL; }
 
 private:
  Label label_;
  LLabel* replacement_;
};
 
 
class LParameter FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE {
    return false;
  }
  DECLARE_CONCRETE_INSTRUCTION(Parameter, "parameter")
};
 
 
class LCallStub FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LCallStub(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CallStub, "call-stub")
  DECLARE_HYDROGEN_ACCESSOR(CallStub)
};
 
 
class LTailCallThroughMegamorphicCache FINAL
    : public LTemplateInstruction<0, 3, 0> {
 public:
  explicit LTailCallThroughMegamorphicCache(LOperand* context,
                                            LOperand* receiver,
                                            LOperand* name) {
    inputs_[0] = context;
    inputs_[1] = receiver;
    inputs_[2] = name;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* receiver() { return inputs_[1]; }
  LOperand* name() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(TailCallThroughMegamorphicCache,
                               "tail-call-through-megamorphic-cache")
  DECLARE_HYDROGEN_ACCESSOR(TailCallThroughMegamorphicCache)
};
 
 
class LUnknownOSRValue FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE {
    return false;
  }
  DECLARE_CONCRETE_INSTRUCTION(UnknownOSRValue, "unknown-osr-value")
};
 
 
template<int I, int T>
class LControlInstruction : public LTemplateInstruction<0, I, T> {
 public:
  LControlInstruction() : false_label_(NULL), true_label_(NULL) { }
 
  virtual bool IsControl() const FINAL OVERRIDE { return true; }
 
  int SuccessorCount() { return hydrogen()->SuccessorCount(); }
  HBasicBlock* SuccessorAt(int i) { return hydrogen()->SuccessorAt(i); }
 
  int TrueDestination(LChunk* chunk) {
    return chunk->LookupDestination(true_block_id());
  }
  int FalseDestination(LChunk* chunk) {
    return chunk->LookupDestination(false_block_id());
  }
 
  Label* TrueLabel(LChunk* chunk) {
    if (true_label_ == NULL) {
      true_label_ = chunk->GetAssemblyLabel(TrueDestination(chunk));
    }
    return true_label_;
  }
  Label* FalseLabel(LChunk* chunk) {
    if (false_label_ == NULL) {
      false_label_ = chunk->GetAssemblyLabel(FalseDestination(chunk));
    }
    return false_label_;
  }
 
 protected:
  int true_block_id() { return SuccessorAt(0)->block_id(); }
  int false_block_id() { return SuccessorAt(1)->block_id(); }
 
 private:
  HControlInstruction* hydrogen() {
    return HControlInstruction::cast(this->hydrogen_value());
  }
 
  Label* false_label_;
  Label* true_label_;
};
 
 
class LWrapReceiver FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LWrapReceiver(LOperand* receiver, LOperand* function) {
    inputs_[0] = receiver;
    inputs_[1] = function;
  }
 
  DECLARE_CONCRETE_INSTRUCTION(WrapReceiver, "wrap-receiver")
  DECLARE_HYDROGEN_ACCESSOR(WrapReceiver)
 
  LOperand* receiver() { return inputs_[0]; }
  LOperand* function() { return inputs_[1]; }
};
 
 
class LApplyArguments FINAL : public LTemplateInstruction<1, 4, 0> {
 public:
  LApplyArguments(LOperand* function,
                  LOperand* receiver,
                  LOperand* length,
                  LOperand* elements) {
    inputs_[0] = function;
    inputs_[1] = receiver;
    inputs_[2] = length;
    inputs_[3] = elements;
  }
 
  DECLARE_CONCRETE_INSTRUCTION(ApplyArguments, "apply-arguments")
 
  LOperand* function() { return inputs_[0]; }
  LOperand* receiver() { return inputs_[1]; }
  LOperand* length() { return inputs_[2]; }
  LOperand* elements() { return inputs_[3]; }
};
 
 
class LAccessArgumentsAt FINAL : public LTemplateInstruction<1, 3, 0> {
 public:
  LAccessArgumentsAt(LOperand* arguments, LOperand* length, LOperand* index) {
    inputs_[0] = arguments;
    inputs_[1] = length;
    inputs_[2] = index;
  }
 
  DECLARE_CONCRETE_INSTRUCTION(AccessArgumentsAt, "access-arguments-at")
 
  LOperand* arguments() { return inputs_[0]; }
  LOperand* length() { return inputs_[1]; }
  LOperand* index() { return inputs_[2]; }
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LArgumentsLength FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LArgumentsLength(LOperand* elements) {
    inputs_[0] = elements;
  }
 
  LOperand* elements() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ArgumentsLength, "arguments-length")
};
 
 
class LArgumentsElements FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(ArgumentsElements, "arguments-elements")
  DECLARE_HYDROGEN_ACCESSOR(ArgumentsElements)
};
 
 
class LModByPowerOf2I FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  LModByPowerOf2I(LOperand* dividend, int32_t divisor) {
    inputs_[0] = dividend;
    divisor_ = divisor;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  int32_t divisor() const { return divisor_; }
 
  DECLARE_CONCRETE_INSTRUCTION(ModByPowerOf2I, "mod-by-power-of-2-i")
  DECLARE_HYDROGEN_ACCESSOR(Mod)
 
 private:
  int32_t divisor_;
};
 
 
class LModByConstI FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  LModByConstI(LOperand* dividend, int32_t divisor) {
    inputs_[0] = dividend;
    divisor_ = divisor;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  int32_t divisor() const { return divisor_; }
 
  DECLARE_CONCRETE_INSTRUCTION(ModByConstI, "mod-by-const-i")
  DECLARE_HYDROGEN_ACCESSOR(Mod)
 
 private:
  int32_t divisor_;
};
 
 
class LModI FINAL : public LTemplateInstruction<1, 2, 3> {
 public:
  LModI(LOperand* left,
        LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ModI, "mod-i")
  DECLARE_HYDROGEN_ACCESSOR(Mod)
};
 
 
class LDivByPowerOf2I FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  LDivByPowerOf2I(LOperand* dividend, int32_t divisor) {
    inputs_[0] = dividend;
    divisor_ = divisor;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  int32_t divisor() const { return divisor_; }
 
  DECLARE_CONCRETE_INSTRUCTION(DivByPowerOf2I, "div-by-power-of-2-i")
  DECLARE_HYDROGEN_ACCESSOR(Div)
 
 private:
  int32_t divisor_;
};
 
 
class LDivByConstI FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  LDivByConstI(LOperand* dividend, int32_t divisor) {
    inputs_[0] = dividend;
    divisor_ = divisor;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  int32_t divisor() const { return divisor_; }
 
  DECLARE_CONCRETE_INSTRUCTION(DivByConstI, "div-by-const-i")
  DECLARE_HYDROGEN_ACCESSOR(Div)
 
 private:
  int32_t divisor_;
};
 
 
class LDivI FINAL : public LTemplateInstruction<1, 2, 1> {
 public:
  LDivI(LOperand* dividend, LOperand* divisor, LOperand* temp) {
    inputs_[0] = dividend;
    inputs_[1] = divisor;
    temps_[0] = temp;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  LOperand* divisor() { return inputs_[1]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(DivI, "div-i")
  DECLARE_HYDROGEN_ACCESSOR(BinaryOperation)
};
 
 
class LFlooringDivByPowerOf2I FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  LFlooringDivByPowerOf2I(LOperand* dividend, int32_t divisor) {
    inputs_[0] = dividend;
    divisor_ = divisor;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  int32_t divisor() { return divisor_; }
 
  DECLARE_CONCRETE_INSTRUCTION(FlooringDivByPowerOf2I,
                               "flooring-div-by-power-of-2-i")
  DECLARE_HYDROGEN_ACCESSOR(MathFloorOfDiv)
 
 private:
  int32_t divisor_;
};
 
 
class LFlooringDivByConstI FINAL : public LTemplateInstruction<1, 1, 2> {
 public:
  LFlooringDivByConstI(LOperand* dividend, int32_t divisor, LOperand* temp) {
    inputs_[0] = dividend;
    divisor_ = divisor;
    temps_[0] = temp;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  int32_t divisor() const { return divisor_; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(FlooringDivByConstI, "flooring-div-by-const-i")
  DECLARE_HYDROGEN_ACCESSOR(MathFloorOfDiv)
 
 private:
  int32_t divisor_;
};
 
 
class LFlooringDivI FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LFlooringDivI(LOperand* dividend, LOperand* divisor) {
    inputs_[0] = dividend;
    inputs_[1] = divisor;
  }
 
  LOperand* dividend() { return inputs_[0]; }
  LOperand* divisor() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(FlooringDivI, "flooring-div-i")
  DECLARE_HYDROGEN_ACCESSOR(MathFloorOfDiv)
};
 
 
class LMulI FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LMulI(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MulI, "mul-i")
  DECLARE_HYDROGEN_ACCESSOR(Mul)
};
 
 
// Instruction for computing multiplier * multiplicand + addend.
class LMultiplyAddD FINAL : public LTemplateInstruction<1, 3, 0> {
 public:
  LMultiplyAddD(LOperand* addend, LOperand* multiplier,
                LOperand* multiplicand) {
    inputs_[0] = addend;
    inputs_[1] = multiplier;
    inputs_[2] = multiplicand;
  }
 
  LOperand* addend() { return inputs_[0]; }
  LOperand* multiplier() { return inputs_[1]; }
  LOperand* multiplicand() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MultiplyAddD, "multiply-add-d")
};
 
 
class LDebugBreak FINAL : public LTemplateInstruction<0, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(DebugBreak, "break")
};
 
 
class LCompareNumericAndBranch FINAL : public LControlInstruction<2, 0> {
 public:
  LCompareNumericAndBranch(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CompareNumericAndBranch,
                               "compare-numeric-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(CompareNumericAndBranch)
 
  Token::Value op() const { return hydrogen()->token(); }
  bool is_double() const {
    return hydrogen()->representation().IsDouble();
  }
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LMathFloor FINAL : public LTemplateInstruction<1, 1, 1> {
 public:
  LMathFloor(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathFloor, "math-floor")
  DECLARE_HYDROGEN_ACCESSOR(UnaryMathOperation)
};
 
 
class LMathRound FINAL : public LTemplateInstruction<1, 1, 1> {
 public:
  LMathRound(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathRound, "math-round")
  DECLARE_HYDROGEN_ACCESSOR(UnaryMathOperation)
};
 
 
class LMathFround FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LMathFround(LOperand* value) { inputs_[0] = value; }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathFround, "math-fround")
};
 
 
class LMathAbs FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LMathAbs(LOperand* context, LOperand* value) {
    inputs_[1] = context;
    inputs_[0] = value;
  }
 
  LOperand* context() { return inputs_[1]; }
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathAbs, "math-abs")
  DECLARE_HYDROGEN_ACCESSOR(UnaryMathOperation)
};
 
 
class LMathLog FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LMathLog(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathLog, "math-log")
};
 
 
class LMathClz32 FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LMathClz32(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathClz32, "math-clz32")
};
 
 
class LMathExp FINAL : public LTemplateInstruction<1, 1, 3> {
 public:
  LMathExp(LOperand* value,
           LOperand* double_temp,
           LOperand* temp1,
           LOperand* temp2) {
    inputs_[0] = value;
    temps_[0] = temp1;
    temps_[1] = temp2;
    temps_[2] = double_temp;
    ExternalReference::InitializeMathExpData();
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp1() { return temps_[0]; }
  LOperand* temp2() { return temps_[1]; }
  LOperand* double_temp() { return temps_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathExp, "math-exp")
};
 
 
class LMathSqrt FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LMathSqrt(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathSqrt, "math-sqrt")
};
 
 
class LMathPowHalf FINAL : public LTemplateInstruction<1, 1, 1> {
 public:
  LMathPowHalf(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathPowHalf, "math-pow-half")
};
 
 
class LCmpObjectEqAndBranch FINAL : public LControlInstruction<2, 0> {
 public:
  LCmpObjectEqAndBranch(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CmpObjectEqAndBranch, "cmp-object-eq-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(CompareObjectEqAndBranch)
};
 
 
class LCmpHoleAndBranch FINAL : public LControlInstruction<1, 0> {
 public:
  explicit LCmpHoleAndBranch(LOperand* object) {
    inputs_[0] = object;
  }
 
  LOperand* object() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CmpHoleAndBranch, "cmp-hole-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(CompareHoleAndBranch)
};
 
 
class LCompareMinusZeroAndBranch FINAL : public LControlInstruction<1, 1> {
 public:
  LCompareMinusZeroAndBranch(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CompareMinusZeroAndBranch,
                               "cmp-minus-zero-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(CompareMinusZeroAndBranch)
};
 
 
class LIsObjectAndBranch FINAL : public LControlInstruction<1, 1> {
 public:
  LIsObjectAndBranch(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(IsObjectAndBranch, "is-object-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(IsObjectAndBranch)
 
  virtual void PrintDataTo(StringStream* stream);
};
 
 
class LIsStringAndBranch FINAL : public LControlInstruction<1, 1> {
 public:
  LIsStringAndBranch(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(IsStringAndBranch, "is-string-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(IsStringAndBranch)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LIsSmiAndBranch FINAL : public LControlInstruction<1, 0> {
 public:
  explicit LIsSmiAndBranch(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(IsSmiAndBranch, "is-smi-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(IsSmiAndBranch)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LIsUndetectableAndBranch FINAL : public LControlInstruction<1, 1> {
 public:
  explicit LIsUndetectableAndBranch(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(IsUndetectableAndBranch,
                               "is-undetectable-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(IsUndetectableAndBranch)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LStringCompareAndBranch FINAL : public LControlInstruction<3, 0> {
 public:
  LStringCompareAndBranch(LOperand* context, LOperand* left, LOperand* right) {
    inputs_[0] = context;
    inputs_[1] = left;
    inputs_[2] = right;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* left() { return inputs_[1]; }
  LOperand* right() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StringCompareAndBranch,
                               "string-compare-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(StringCompareAndBranch)
 
  Token::Value op() const { return hydrogen()->token(); }
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LHasInstanceTypeAndBranch FINAL : public LControlInstruction<1, 0> {
 public:
  explicit LHasInstanceTypeAndBranch(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(HasInstanceTypeAndBranch,
                               "has-instance-type-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(HasInstanceTypeAndBranch)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LGetCachedArrayIndex FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LGetCachedArrayIndex(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(GetCachedArrayIndex, "get-cached-array-index")
  DECLARE_HYDROGEN_ACCESSOR(GetCachedArrayIndex)
};
 
 
class LHasCachedArrayIndexAndBranch FINAL
    : public LControlInstruction<1, 0> {
 public:
  explicit LHasCachedArrayIndexAndBranch(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(HasCachedArrayIndexAndBranch,
                               "has-cached-array-index-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(HasCachedArrayIndexAndBranch)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LClassOfTestAndBranch FINAL : public LControlInstruction<1, 1> {
 public:
  LClassOfTestAndBranch(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ClassOfTestAndBranch,
                               "class-of-test-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(ClassOfTestAndBranch)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LCmpT FINAL : public LTemplateInstruction<1, 3, 0> {
 public:
  LCmpT(LOperand* context, LOperand* left, LOperand* right) {
    inputs_[0] = context;
    inputs_[1] = left;
    inputs_[2] = right;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* left() { return inputs_[1]; }
  LOperand* right() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CmpT, "cmp-t")
  DECLARE_HYDROGEN_ACCESSOR(CompareGeneric)
 
  Token::Value op() const { return hydrogen()->token(); }
};
 
 
class LInstanceOf FINAL : public LTemplateInstruction<1, 3, 0> {
 public:
  LInstanceOf(LOperand* context, LOperand* left, LOperand* right) {
    inputs_[0] = context;
    inputs_[1] = left;
    inputs_[2] = right;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* left() { return inputs_[1]; }
  LOperand* right() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(InstanceOf, "instance-of")
};
 
 
class LInstanceOfKnownGlobal FINAL : public LTemplateInstruction<1, 2, 1> {
 public:
  LInstanceOfKnownGlobal(LOperand* context, LOperand* value, LOperand* temp) {
    inputs_[0] = context;
    inputs_[1] = value;
    temps_[0] = temp;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* value() { return inputs_[1]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(InstanceOfKnownGlobal,
                               "instance-of-known-global")
  DECLARE_HYDROGEN_ACCESSOR(InstanceOfKnownGlobal)
 
  Handle<JSFunction> function() const { return hydrogen()->function(); }
  LEnvironment* GetDeferredLazyDeoptimizationEnvironment() {
    return lazy_deopt_env_;
  }
  virtual void SetDeferredLazyDeoptimizationEnvironment(
      LEnvironment* env) OVERRIDE {
    lazy_deopt_env_ = env;
  }
 
 private:
  LEnvironment* lazy_deopt_env_;
};
 
 
class LBoundsCheck FINAL : public LTemplateInstruction<0, 2, 0> {
 public:
  LBoundsCheck(LOperand* index, LOperand* length) {
    inputs_[0] = index;
    inputs_[1] = length;
  }
 
  LOperand* index() { return inputs_[0]; }
  LOperand* length() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(BoundsCheck, "bounds-check")
  DECLARE_HYDROGEN_ACCESSOR(BoundsCheck)
};
 
 
class LBitI FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LBitI(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  Token::Value op() const { return hydrogen()->op(); }
 
  DECLARE_CONCRETE_INSTRUCTION(BitI, "bit-i")
  DECLARE_HYDROGEN_ACCESSOR(Bitwise)
};
 
 
class LShiftI FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LShiftI(Token::Value op, LOperand* left, LOperand* right, bool can_deopt)
      : op_(op), can_deopt_(can_deopt) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  Token::Value op() const { return op_; }
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
  bool can_deopt() const { return can_deopt_; }
 
  DECLARE_CONCRETE_INSTRUCTION(ShiftI, "shift-i")
 
 private:
  Token::Value op_;
  bool can_deopt_;
};
 
 
class LSubI FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LSubI(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(SubI, "sub-i")
  DECLARE_HYDROGEN_ACCESSOR(Sub)
};
 
 
class LConstantI FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(ConstantI, "constant-i")
  DECLARE_HYDROGEN_ACCESSOR(Constant)
 
  int32_t value() const { return hydrogen()->Integer32Value(); }
};
 
 
class LConstantS FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(ConstantS, "constant-s")
  DECLARE_HYDROGEN_ACCESSOR(Constant)
 
  Smi* value() const { return Smi::FromInt(hydrogen()->Integer32Value()); }
};
 
 
class LConstantD FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(ConstantD, "constant-d")
  DECLARE_HYDROGEN_ACCESSOR(Constant)
 
  double value() const { return hydrogen()->DoubleValue(); }
};
 
 
class LConstantE FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(ConstantE, "constant-e")
  DECLARE_HYDROGEN_ACCESSOR(Constant)
 
  ExternalReference value() const {
    return hydrogen()->ExternalReferenceValue();
  }
};
 
 
class LConstantT FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(ConstantT, "constant-t")
  DECLARE_HYDROGEN_ACCESSOR(Constant)
 
  Handle<Object> value(Isolate* isolate) const {
    return hydrogen()->handle(isolate);
  }
};
 
 
class LBranch FINAL : public LControlInstruction<1, 0> {
 public:
  explicit LBranch(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(Branch, "branch")
  DECLARE_HYDROGEN_ACCESSOR(Branch)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LCmpMapAndBranch FINAL : public LControlInstruction<1, 1> {
 public:
  LCmpMapAndBranch(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CmpMapAndBranch, "cmp-map-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(CompareMap)
 
  Handle<Map> map() const { return hydrogen()->map().handle(); }
};
 
 
class LMapEnumLength FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LMapEnumLength(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MapEnumLength, "map-enum-length")
};
 
 
class LDateField FINAL : public LTemplateInstruction<1, 1, 1> {
 public:
  LDateField(LOperand* date, LOperand* temp, Smi* index) : index_(index) {
    inputs_[0] = date;
    temps_[0] = temp;
  }
 
  LOperand* date() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
  Smi* index() const { return index_; }
 
  DECLARE_CONCRETE_INSTRUCTION(DateField, "date-field")
  DECLARE_HYDROGEN_ACCESSOR(DateField)
 
 private:
  Smi* index_;
};
 
 
class LSeqStringGetChar FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LSeqStringGetChar(LOperand* string, LOperand* index) {
    inputs_[0] = string;
    inputs_[1] = index;
  }
 
  LOperand* string() const { return inputs_[0]; }
  LOperand* index() const { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(SeqStringGetChar, "seq-string-get-char")
  DECLARE_HYDROGEN_ACCESSOR(SeqStringGetChar)
};
 
 
class LSeqStringSetChar FINAL : public LTemplateInstruction<1, 4, 0> {
 public:
  LSeqStringSetChar(LOperand* context,
                    LOperand* string,
                    LOperand* index,
                    LOperand* value) {
    inputs_[0] = context;
    inputs_[1] = string;
    inputs_[2] = index;
    inputs_[3] = value;
  }
 
  LOperand* string() { return inputs_[1]; }
  LOperand* index() { return inputs_[2]; }
  LOperand* value() { return inputs_[3]; }
 
  DECLARE_CONCRETE_INSTRUCTION(SeqStringSetChar, "seq-string-set-char")
  DECLARE_HYDROGEN_ACCESSOR(SeqStringSetChar)
};
 
 
class LAddI FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LAddI(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(AddI, "add-i")
  DECLARE_HYDROGEN_ACCESSOR(Add)
};
 
 
class LMathMinMax FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LMathMinMax(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(MathMinMax, "math-min-max")
  DECLARE_HYDROGEN_ACCESSOR(MathMinMax)
};
 
 
class LPower FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LPower(LOperand* left, LOperand* right) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(Power, "power")
  DECLARE_HYDROGEN_ACCESSOR(Power)
};
 
 
class LArithmeticD FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LArithmeticD(Token::Value op, LOperand* left, LOperand* right)
      : op_(op) {
    inputs_[0] = left;
    inputs_[1] = right;
  }
 
  Token::Value op() const { return op_; }
  LOperand* left() { return inputs_[0]; }
  LOperand* right() { return inputs_[1]; }
 
  virtual Opcode opcode() const OVERRIDE {
    return LInstruction::kArithmeticD;
  }
  virtual void CompileToNative(LCodeGen* generator) OVERRIDE;
  virtual const char* Mnemonic() const OVERRIDE;
 
 private:
  Token::Value op_;
};
 
 
class LArithmeticT FINAL : public LTemplateInstruction<1, 3, 0> {
 public:
  LArithmeticT(Token::Value op,
               LOperand* context,
               LOperand* left,
               LOperand* right)
      : op_(op) {
    inputs_[0] = context;
    inputs_[1] = left;
    inputs_[2] = right;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* left() { return inputs_[1]; }
  LOperand* right() { return inputs_[2]; }
  Token::Value op() const { return op_; }
 
  virtual Opcode opcode() const FINAL  { return LInstruction::kArithmeticT; }
  virtual void CompileToNative(LCodeGen* generator) OVERRIDE;
  virtual const char* Mnemonic() const OVERRIDE;
 
 private:
  Token::Value op_;
};
 
 
class LReturn FINAL : public LTemplateInstruction<0, 3, 0> {
 public:
  LReturn(LOperand* value, LOperand* context, LOperand* parameter_count) {
    inputs_[0] = value;
    inputs_[1] = context;
    inputs_[2] = parameter_count;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  bool has_constant_parameter_count() {
    return parameter_count()->IsConstantOperand();
  }
  LConstantOperand* constant_parameter_count() {
    DCHECK(has_constant_parameter_count());
    return LConstantOperand::cast(parameter_count());
  }
  LOperand* parameter_count() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(Return, "return")
};
 
 
class LLoadNamedField FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LLoadNamedField(LOperand* object) {
    inputs_[0] = object;
  }
 
  LOperand* object() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadNamedField, "load-named-field")
  DECLARE_HYDROGEN_ACCESSOR(LoadNamedField)
};
 
 
class LLoadNamedGeneric FINAL : public LTemplateInstruction<1, 2, 1> {
 public:
  LLoadNamedGeneric(LOperand* context, LOperand* object, LOperand* vector) {
    inputs_[0] = context;
    inputs_[1] = object;
    temps_[0] = vector;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* object() { return inputs_[1]; }
  LOperand* temp_vector() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadNamedGeneric, "load-named-generic")
  DECLARE_HYDROGEN_ACCESSOR(LoadNamedGeneric)
 
  Handle<Object> name() const { return hydrogen()->name(); }
};
 
 
class LLoadFunctionPrototype FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LLoadFunctionPrototype(LOperand* function) {
    inputs_[0] = function;
  }
 
  LOperand* function() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadFunctionPrototype, "load-function-prototype")
  DECLARE_HYDROGEN_ACCESSOR(LoadFunctionPrototype)
};
 
 
class LLoadRoot FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(LoadRoot, "load-root")
  DECLARE_HYDROGEN_ACCESSOR(LoadRoot)
 
  Heap::RootListIndex index() const { return hydrogen()->index(); }
};
 
 
class LLoadKeyed FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LLoadKeyed(LOperand* elements, LOperand* key) {
    inputs_[0] = elements;
    inputs_[1] = key;
  }
 
  LOperand* elements() { return inputs_[0]; }
  LOperand* key() { return inputs_[1]; }
  ElementsKind elements_kind() const {
    return hydrogen()->elements_kind();
  }
  bool is_external() const {
    return hydrogen()->is_external();
  }
  bool is_fixed_typed_array() const {
    return hydrogen()->is_fixed_typed_array();
  }
  bool is_typed_elements() const {
    return is_external() || is_fixed_typed_array();
  }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadKeyed, "load-keyed")
  DECLARE_HYDROGEN_ACCESSOR(LoadKeyed)
 
  virtual void PrintDataTo(StringStream* stream);
  uint32_t base_offset() const { return hydrogen()->base_offset(); }
};
 
 
class LLoadKeyedGeneric FINAL : public LTemplateInstruction<1, 3, 1> {
 public:
  LLoadKeyedGeneric(LOperand* context, LOperand* object, LOperand* key,
                    LOperand* vector) {
    inputs_[0] = context;
    inputs_[1] = object;
    inputs_[2] = key;
    temps_[0] = vector;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* object() { return inputs_[1]; }
  LOperand* key() { return inputs_[2]; }
  LOperand* temp_vector() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadKeyedGeneric, "load-keyed-generic")
  DECLARE_HYDROGEN_ACCESSOR(LoadKeyedGeneric)
};
 
 
class LLoadGlobalCell FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(LoadGlobalCell, "load-global-cell")
  DECLARE_HYDROGEN_ACCESSOR(LoadGlobalCell)
};
 
 
class LLoadGlobalGeneric FINAL : public LTemplateInstruction<1, 2, 1> {
 public:
  LLoadGlobalGeneric(LOperand* context, LOperand* global_object,
                     LOperand* vector) {
    inputs_[0] = context;
    inputs_[1] = global_object;
    temps_[0] = vector;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* global_object() { return inputs_[1]; }
  LOperand* temp_vector() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadGlobalGeneric, "load-global-generic")
  DECLARE_HYDROGEN_ACCESSOR(LoadGlobalGeneric)
 
  Handle<Object> name() const { return hydrogen()->name(); }
  bool for_typeof() const { return hydrogen()->for_typeof(); }
};
 
 
class LStoreGlobalCell FINAL : public LTemplateInstruction<0, 1, 1> {
 public:
  LStoreGlobalCell(LOperand* value, LOperand* temp) {
    inputs_[0] = value;
    temps_[0] = temp;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StoreGlobalCell, "store-global-cell")
  DECLARE_HYDROGEN_ACCESSOR(StoreGlobalCell)
};
 
 
class LLoadContextSlot FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LLoadContextSlot(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadContextSlot, "load-context-slot")
  DECLARE_HYDROGEN_ACCESSOR(LoadContextSlot)
 
  int slot_index() { return hydrogen()->slot_index(); }
 
  virtual void PrintDataTo(StringStream* stream);
};
 
 
class LStoreContextSlot FINAL : public LTemplateInstruction<0, 2, 0> {
 public:
  LStoreContextSlot(LOperand* context, LOperand* value) {
    inputs_[0] = context;
    inputs_[1] = value;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* value() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StoreContextSlot, "store-context-slot")
  DECLARE_HYDROGEN_ACCESSOR(StoreContextSlot)
 
  int slot_index() { return hydrogen()->slot_index(); }
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LPushArgument FINAL : public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LPushArgument(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(PushArgument, "push-argument")
};
 
 
class LDrop FINAL : public LTemplateInstruction<0, 0, 0> {
 public:
  explicit LDrop(int count) : count_(count) { }
 
  int count() const { return count_; }
 
  DECLARE_CONCRETE_INSTRUCTION(Drop, "drop")
 
 private:
  int count_;
};
 
 
class LStoreCodeEntry FINAL: public LTemplateInstruction<0, 2, 0> {
 public:
  LStoreCodeEntry(LOperand* function, LOperand* code_object) {
    inputs_[0] = function;
    inputs_[1] = code_object;
  }
 
  LOperand* function() { return inputs_[0]; }
  LOperand* code_object() { return inputs_[1]; }
 
  virtual void PrintDataTo(StringStream* stream);
 
  DECLARE_CONCRETE_INSTRUCTION(StoreCodeEntry, "store-code-entry")
  DECLARE_HYDROGEN_ACCESSOR(StoreCodeEntry)
};
 
 
class LInnerAllocatedObject FINAL: public LTemplateInstruction<1, 2, 0> {
 public:
  LInnerAllocatedObject(LOperand* base_object, LOperand* offset) {
    inputs_[0] = base_object;
    inputs_[1] = offset;
  }
 
  LOperand* base_object() const { return inputs_[0]; }
  LOperand* offset() const { return inputs_[1]; }
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  DECLARE_CONCRETE_INSTRUCTION(InnerAllocatedObject, "inner-allocated-object")
};
 
 
class LThisFunction FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(ThisFunction, "this-function")
  DECLARE_HYDROGEN_ACCESSOR(ThisFunction)
};
 
 
class LContext FINAL : public LTemplateInstruction<1, 0, 0> {
 public:
  DECLARE_CONCRETE_INSTRUCTION(Context, "context")
  DECLARE_HYDROGEN_ACCESSOR(Context)
};
 
 
class LDeclareGlobals FINAL : public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LDeclareGlobals(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(DeclareGlobals, "declare-globals")
  DECLARE_HYDROGEN_ACCESSOR(DeclareGlobals)
};
 
 
class LCallJSFunction FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LCallJSFunction(LOperand* function) {
    inputs_[0] = function;
  }
 
  LOperand* function() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CallJSFunction, "call-js-function")
  DECLARE_HYDROGEN_ACCESSOR(CallJSFunction)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  int arity() const { return hydrogen()->argument_count() - 1; }
};
 
 
class LCallWithDescriptor FINAL : public LTemplateResultInstruction<1> {
 public:
  LCallWithDescriptor(CallInterfaceDescriptor descriptor,
                      const ZoneList<LOperand*>& operands, Zone* zone)
      : descriptor_(descriptor),
        inputs_(descriptor.GetRegisterParameterCount() + 1, zone) {
    DCHECK(descriptor.GetRegisterParameterCount() + 1 == operands.length());
    inputs_.AddAll(operands, zone);
  }
 
  LOperand* target() const { return inputs_[0]; }
 
  const CallInterfaceDescriptor descriptor() { return descriptor_; }
 
 private:
  DECLARE_CONCRETE_INSTRUCTION(CallWithDescriptor, "call-with-descriptor")
  DECLARE_HYDROGEN_ACCESSOR(CallWithDescriptor)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  int arity() const { return hydrogen()->argument_count() - 1; }
 
  CallInterfaceDescriptor descriptor_;
  ZoneList<LOperand*> inputs_;
 
  // Iterator support.
  virtual int InputCount() FINAL OVERRIDE { return inputs_.length(); }
  virtual LOperand* InputAt(int i) FINAL OVERRIDE { return inputs_[i]; }
 
  virtual int TempCount() FINAL OVERRIDE { return 0; }
  virtual LOperand* TempAt(int i) FINAL OVERRIDE { return NULL; }
};
 
 
class LInvokeFunction FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LInvokeFunction(LOperand* context, LOperand* function) {
    inputs_[0] = context;
    inputs_[1] = function;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* function() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(InvokeFunction, "invoke-function")
  DECLARE_HYDROGEN_ACCESSOR(InvokeFunction)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  int arity() const { return hydrogen()->argument_count() - 1; }
};
 
 
class LCallFunction FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LCallFunction(LOperand* context, LOperand* function) {
    inputs_[0] = context;
    inputs_[1] = function;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* function() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CallFunction, "call-function")
  DECLARE_HYDROGEN_ACCESSOR(CallFunction)
 
  int arity() const { return hydrogen()->argument_count() - 1; }
};
 
 
class LCallNew FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LCallNew(LOperand* context, LOperand* constructor) {
    inputs_[0] = context;
    inputs_[1] = constructor;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* constructor() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CallNew, "call-new")
  DECLARE_HYDROGEN_ACCESSOR(CallNew)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  int arity() const { return hydrogen()->argument_count() - 1; }
};
 
 
class LCallNewArray FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LCallNewArray(LOperand* context, LOperand* constructor) {
    inputs_[0] = context;
    inputs_[1] = constructor;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* constructor() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CallNewArray, "call-new-array")
  DECLARE_HYDROGEN_ACCESSOR(CallNewArray)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  int arity() const { return hydrogen()->argument_count() - 1; }
};
 
 
class LCallRuntime FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LCallRuntime(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CallRuntime, "call-runtime")
  DECLARE_HYDROGEN_ACCESSOR(CallRuntime)
 
  virtual bool ClobbersDoubleRegisters(Isolate* isolate) const OVERRIDE {
    return save_doubles() == kDontSaveFPRegs;
  }
 
  const Runtime::Function* function() const { return hydrogen()->function(); }
  int arity() const { return hydrogen()->argument_count(); }
  SaveFPRegsMode save_doubles() const { return hydrogen()->save_doubles(); }
};
 
 
class LInteger32ToDouble FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LInteger32ToDouble(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(Integer32ToDouble, "int32-to-double")
};
 
 
class LUint32ToDouble FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LUint32ToDouble(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(Uint32ToDouble, "uint32-to-double")
};
 
 
class LNumberTagI FINAL : public LTemplateInstruction<1, 1, 2> {
 public:
  LNumberTagI(LOperand* value, LOperand* temp1, LOperand* temp2) {
    inputs_[0] = value;
    temps_[0] = temp1;
    temps_[1] = temp2;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp1() { return temps_[0]; }
  LOperand* temp2() { return temps_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(NumberTagI, "number-tag-i")
};
 
 
class LNumberTagU FINAL : public LTemplateInstruction<1, 1, 2> {
 public:
  LNumberTagU(LOperand* value, LOperand* temp1, LOperand* temp2) {
    inputs_[0] = value;
    temps_[0] = temp1;
    temps_[1] = temp2;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp1() { return temps_[0]; }
  LOperand* temp2() { return temps_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(NumberTagU, "number-tag-u")
};
 
 
class LNumberTagD FINAL : public LTemplateInstruction<1, 1, 2> {
 public:
  LNumberTagD(LOperand* value, LOperand* temp, LOperand* temp2) {
    inputs_[0] = value;
    temps_[0] = temp;
    temps_[1] = temp2;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
  LOperand* temp2() { return temps_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(NumberTagD, "number-tag-d")
  DECLARE_HYDROGEN_ACCESSOR(Change)
};
 
 
class LDoubleToSmi FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LDoubleToSmi(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(DoubleToSmi, "double-to-smi")
  DECLARE_HYDROGEN_ACCESSOR(UnaryOperation)
 
  bool truncating() { return hydrogen()->CanTruncateToInt32(); }
};
 
 
// Sometimes truncating conversion from a tagged value to an int32.
class LDoubleToI FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LDoubleToI(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(DoubleToI, "double-to-i")
  DECLARE_HYDROGEN_ACCESSOR(UnaryOperation)
 
  bool truncating() { return hydrogen()->CanTruncateToInt32(); }
};
 
 
// Truncating conversion from a tagged value to an int32.
class LTaggedToI FINAL : public LTemplateInstruction<1, 1, 2> {
 public:
  LTaggedToI(LOperand* value,
             LOperand* temp,
             LOperand* temp2) {
    inputs_[0] = value;
    temps_[0] = temp;
    temps_[1] = temp2;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
  LOperand* temp2() { return temps_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(TaggedToI, "tagged-to-i")
  DECLARE_HYDROGEN_ACCESSOR(Change)
 
  bool truncating() { return hydrogen()->CanTruncateToInt32(); }
};
 
 
class LSmiTag FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LSmiTag(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(SmiTag, "smi-tag")
  DECLARE_HYDROGEN_ACCESSOR(Change)
};
 
 
class LNumberUntagD FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LNumberUntagD(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(NumberUntagD, "double-untag")
  DECLARE_HYDROGEN_ACCESSOR(Change)
};
 
 
class LSmiUntag FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  LSmiUntag(LOperand* value, bool needs_check)
      : needs_check_(needs_check) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
  bool needs_check() const { return needs_check_; }
 
  DECLARE_CONCRETE_INSTRUCTION(SmiUntag, "smi-untag")
 
 private:
  bool needs_check_;
};
 
 
class LStoreNamedField FINAL : public LTemplateInstruction<0, 2, 1> {
 public:
  LStoreNamedField(LOperand* object, LOperand* value, LOperand* temp) {
    inputs_[0] = object;
    inputs_[1] = value;
    temps_[0] = temp;
  }
 
  LOperand* object() { return inputs_[0]; }
  LOperand* value() { return inputs_[1]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StoreNamedField, "store-named-field")
  DECLARE_HYDROGEN_ACCESSOR(StoreNamedField)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  Representation representation() const {
    return hydrogen()->field_representation();
  }
};
 
 
class LStoreNamedGeneric FINAL : public LTemplateInstruction<0, 3, 0> {
 public:
  LStoreNamedGeneric(LOperand* context, LOperand* object, LOperand* value) {
    inputs_[0] = context;
    inputs_[1] = object;
    inputs_[2] = value;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* object() { return inputs_[1]; }
  LOperand* value() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StoreNamedGeneric, "store-named-generic")
  DECLARE_HYDROGEN_ACCESSOR(StoreNamedGeneric)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  Handle<Object> name() const { return hydrogen()->name(); }
  StrictMode strict_mode() { return hydrogen()->strict_mode(); }
};
 
 
class LStoreKeyed FINAL : public LTemplateInstruction<0, 3, 0> {
 public:
  LStoreKeyed(LOperand* object, LOperand* key, LOperand* value) {
    inputs_[0] = object;
    inputs_[1] = key;
    inputs_[2] = value;
  }
 
  bool is_external() const { return hydrogen()->is_external(); }
  bool is_fixed_typed_array() const {
    return hydrogen()->is_fixed_typed_array();
  }
  bool is_typed_elements() const {
    return is_external() || is_fixed_typed_array();
  }
  LOperand* elements() { return inputs_[0]; }
  LOperand* key() { return inputs_[1]; }
  LOperand* value() { return inputs_[2]; }
  ElementsKind elements_kind() const {
    return hydrogen()->elements_kind();
  }
 
  DECLARE_CONCRETE_INSTRUCTION(StoreKeyed, "store-keyed")
  DECLARE_HYDROGEN_ACCESSOR(StoreKeyed)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
  bool NeedsCanonicalization() { return hydrogen()->NeedsCanonicalization(); }
  uint32_t base_offset() const { return hydrogen()->base_offset(); }
};
 
 
class LStoreKeyedGeneric FINAL : public LTemplateInstruction<0, 4, 0> {
 public:
  LStoreKeyedGeneric(LOperand* context,
                     LOperand* obj,
                     LOperand* key,
                     LOperand* value) {
    inputs_[0] = context;
    inputs_[1] = obj;
    inputs_[2] = key;
    inputs_[3] = value;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* object() { return inputs_[1]; }
  LOperand* key() { return inputs_[2]; }
  LOperand* value() { return inputs_[3]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StoreKeyedGeneric, "store-keyed-generic")
  DECLARE_HYDROGEN_ACCESSOR(StoreKeyedGeneric)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  StrictMode strict_mode() { return hydrogen()->strict_mode(); }
};
 
 
class LTransitionElementsKind FINAL : public LTemplateInstruction<0, 2, 1> {
 public:
  LTransitionElementsKind(LOperand* object,
                          LOperand* context,
                          LOperand* new_map_temp) {
    inputs_[0] = object;
    inputs_[1] = context;
    temps_[0] = new_map_temp;
  }
 
  LOperand* context() { return inputs_[1]; }
  LOperand* object() { return inputs_[0]; }
  LOperand* new_map_temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(TransitionElementsKind,
                               "transition-elements-kind")
  DECLARE_HYDROGEN_ACCESSOR(TransitionElementsKind)
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
  Handle<Map> original_map() { return hydrogen()->original_map().handle(); }
  Handle<Map> transitioned_map() {
    return hydrogen()->transitioned_map().handle();
  }
  ElementsKind from_kind() { return hydrogen()->from_kind(); }
  ElementsKind to_kind() { return hydrogen()->to_kind(); }
};
 
 
class LTrapAllocationMemento FINAL : public LTemplateInstruction<0, 1, 1> {
 public:
  LTrapAllocationMemento(LOperand* object,
                         LOperand* temp) {
    inputs_[0] = object;
    temps_[0] = temp;
  }
 
  LOperand* object() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(TrapAllocationMemento,
                               "trap-allocation-memento")
};
 
 
class LStringAdd FINAL : public LTemplateInstruction<1, 3, 0> {
 public:
  LStringAdd(LOperand* context, LOperand* left, LOperand* right) {
    inputs_[0] = context;
    inputs_[1] = left;
    inputs_[2] = right;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* left() { return inputs_[1]; }
  LOperand* right() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StringAdd, "string-add")
  DECLARE_HYDROGEN_ACCESSOR(StringAdd)
};
 
 
 
class LStringCharCodeAt FINAL : public LTemplateInstruction<1, 3, 0> {
 public:
  LStringCharCodeAt(LOperand* context, LOperand* string, LOperand* index) {
    inputs_[0] = context;
    inputs_[1] = string;
    inputs_[2] = index;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* string() { return inputs_[1]; }
  LOperand* index() { return inputs_[2]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StringCharCodeAt, "string-char-code-at")
  DECLARE_HYDROGEN_ACCESSOR(StringCharCodeAt)
};
 
 
class LStringCharFromCode FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  explicit LStringCharFromCode(LOperand* context, LOperand* char_code) {
    inputs_[0] = context;
    inputs_[1] = char_code;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* char_code() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StringCharFromCode, "string-char-from-code")
  DECLARE_HYDROGEN_ACCESSOR(StringCharFromCode)
};
 
 
class LCheckValue FINAL : public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LCheckValue(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CheckValue, "check-value")
  DECLARE_HYDROGEN_ACCESSOR(CheckValue)
};
 
 
class LCheckInstanceType FINAL : public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LCheckInstanceType(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CheckInstanceType, "check-instance-type")
  DECLARE_HYDROGEN_ACCESSOR(CheckInstanceType)
};
 
 
class LCheckMaps FINAL : public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LCheckMaps(LOperand* value = NULL) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CheckMaps, "check-maps")
  DECLARE_HYDROGEN_ACCESSOR(CheckMaps)
};
 
 
class LCheckSmi FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LCheckSmi(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CheckSmi, "check-smi")
};
 
 
class LCheckNonSmi FINAL : public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LCheckNonSmi(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CheckNonSmi, "check-non-smi")
  DECLARE_HYDROGEN_ACCESSOR(CheckHeapObject)
};
 
 
class LClampDToUint8 FINAL : public LTemplateInstruction<1, 1, 1> {
 public:
  LClampDToUint8(LOperand* unclamped, LOperand* temp) {
    inputs_[0] = unclamped;
    temps_[0] = temp;
  }
 
  LOperand* unclamped() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ClampDToUint8, "clamp-d-to-uint8")
};
 
 
class LClampIToUint8 FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LClampIToUint8(LOperand* unclamped) {
    inputs_[0] = unclamped;
  }
 
  LOperand* unclamped() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ClampIToUint8, "clamp-i-to-uint8")
};
 
 
class LClampTToUint8 FINAL : public LTemplateInstruction<1, 1, 1> {
 public:
  LClampTToUint8(LOperand* unclamped, LOperand* temp) {
    inputs_[0] = unclamped;
    temps_[0] = temp;
  }
 
  LOperand* unclamped() { return inputs_[0]; }
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ClampTToUint8, "clamp-t-to-uint8")
};
 
 
class LDoubleBits FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LDoubleBits(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(DoubleBits, "double-bits")
  DECLARE_HYDROGEN_ACCESSOR(DoubleBits)
};
 
 
class LConstructDouble FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LConstructDouble(LOperand* hi, LOperand* lo) {
    inputs_[0] = hi;
    inputs_[1] = lo;
  }
 
  LOperand* hi() { return inputs_[0]; }
  LOperand* lo() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ConstructDouble, "construct-double")
};
 
 
class LAllocate FINAL : public LTemplateInstruction<1, 2, 2> {
 public:
  LAllocate(LOperand* context,
            LOperand* size,
            LOperand* temp1,
            LOperand* temp2) {
    inputs_[0] = context;
    inputs_[1] = size;
    temps_[0] = temp1;
    temps_[1] = temp2;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* size() { return inputs_[1]; }
  LOperand* temp1() { return temps_[0]; }
  LOperand* temp2() { return temps_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(Allocate, "allocate")
  DECLARE_HYDROGEN_ACCESSOR(Allocate)
};
 
 
class LRegExpLiteral FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LRegExpLiteral(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(RegExpLiteral, "regexp-literal")
  DECLARE_HYDROGEN_ACCESSOR(RegExpLiteral)
};
 
 
class LFunctionLiteral FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LFunctionLiteral(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(FunctionLiteral, "function-literal")
  DECLARE_HYDROGEN_ACCESSOR(FunctionLiteral)
};
 
 
class LToFastProperties FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LToFastProperties(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ToFastProperties, "to-fast-properties")
  DECLARE_HYDROGEN_ACCESSOR(ToFastProperties)
};
 
 
class LTypeof FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LTypeof(LOperand* context, LOperand* value) {
    inputs_[0] = context;
    inputs_[1] = value;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* value() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(Typeof, "typeof")
};
 
 
class LTypeofIsAndBranch FINAL : public LControlInstruction<1, 0> {
 public:
  explicit LTypeofIsAndBranch(LOperand* value) {
    inputs_[0] = value;
  }
 
  LOperand* value() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(TypeofIsAndBranch, "typeof-is-and-branch")
  DECLARE_HYDROGEN_ACCESSOR(TypeofIsAndBranch)
 
  Handle<String> type_literal() { return hydrogen()->type_literal(); }
 
  virtual void PrintDataTo(StringStream* stream) OVERRIDE;
};
 
 
class LIsConstructCallAndBranch FINAL : public LControlInstruction<0, 1> {
 public:
  explicit LIsConstructCallAndBranch(LOperand* temp) {
    temps_[0] = temp;
  }
 
  LOperand* temp() { return temps_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(IsConstructCallAndBranch,
                               "is-construct-call-and-branch")
};
 
 
class LOsrEntry FINAL : public LTemplateInstruction<0, 0, 0> {
 public:
  LOsrEntry() {}
 
  virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE {
    return false;
  }
  DECLARE_CONCRETE_INSTRUCTION(OsrEntry, "osr-entry")
};
 
 
class LStackCheck FINAL : public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LStackCheck(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StackCheck, "stack-check")
  DECLARE_HYDROGEN_ACCESSOR(StackCheck)
 
  Label* done_label() { return &done_label_; }
 
 private:
  Label done_label_;
};
 
 
class LForInPrepareMap FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LForInPrepareMap(LOperand* context, LOperand* object) {
    inputs_[0] = context;
    inputs_[1] = object;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* object() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ForInPrepareMap, "for-in-prepare-map")
};
 
 
class LForInCacheArray FINAL : public LTemplateInstruction<1, 1, 0> {
 public:
  explicit LForInCacheArray(LOperand* map) {
    inputs_[0] = map;
  }
 
  LOperand* map() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(ForInCacheArray, "for-in-cache-array")
 
  int idx() {
    return HForInCacheArray::cast(this->hydrogen_value())->idx();
  }
};
 
 
class LCheckMapValue FINAL : public LTemplateInstruction<0, 2, 0> {
 public:
  LCheckMapValue(LOperand* value, LOperand* map) {
    inputs_[0] = value;
    inputs_[1] = map;
  }
 
  LOperand* value() { return inputs_[0]; }
  LOperand* map() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(CheckMapValue, "check-map-value")
};
 
 
class LLoadFieldByIndex FINAL : public LTemplateInstruction<1, 2, 0> {
 public:
  LLoadFieldByIndex(LOperand* object, LOperand* index) {
    inputs_[0] = object;
    inputs_[1] = index;
  }
 
  LOperand* object() { return inputs_[0]; }
  LOperand* index() { return inputs_[1]; }
 
  DECLARE_CONCRETE_INSTRUCTION(LoadFieldByIndex, "load-field-by-index")
};
 
 
class LStoreFrameContext: public LTemplateInstruction<0, 1, 0> {
 public:
  explicit LStoreFrameContext(LOperand* context) {
    inputs_[0] = context;
  }
 
  LOperand* context() { return inputs_[0]; }
 
  DECLARE_CONCRETE_INSTRUCTION(StoreFrameContext, "store-frame-context")
};
 
 
class LAllocateBlockContext: public LTemplateInstruction<1, 2, 0> {
 public:
  LAllocateBlockContext(LOperand* context, LOperand* function) {
    inputs_[0] = context;
    inputs_[1] = function;
  }
 
  LOperand* context() { return inputs_[0]; }
  LOperand* function() { return inputs_[1]; }
 
  Handle<ScopeInfo> scope_info() { return hydrogen()->scope_info(); }
 
  DECLARE_CONCRETE_INSTRUCTION(AllocateBlockContext, "allocate-block-context")
  DECLARE_HYDROGEN_ACCESSOR(AllocateBlockContext)
};
 
 
class LChunkBuilder;
class LPlatformChunk FINAL : public LChunk {
 public:
  LPlatformChunk(CompilationInfo* info, HGraph* graph)
      : LChunk(info, graph) { }
 
  int GetNextSpillIndex(RegisterKind kind);
  LOperand* GetNextSpillSlot(RegisterKind kind);
};
 
 
class LChunkBuilder FINAL : public LChunkBuilderBase {
 public:
  LChunkBuilder(CompilationInfo* info, HGraph* graph, LAllocator* allocator)
      : LChunkBuilderBase(info, graph),
        current_instruction_(NULL),
        current_block_(NULL),
        next_block_(NULL),
        allocator_(allocator) {}
 
  // Build the sequence for the graph.
  LPlatformChunk* Build();
 
  // Declare methods that deal with the individual node types.
#define DECLARE_DO(type) LInstruction* Do##type(H##type* node);
  HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
#undef DECLARE_DO
 
  LInstruction* DoMultiplyAdd(HMul* mul, HValue* addend);
 
  static bool HasMagicNumberForDivisor(int32_t divisor);
 
  LInstruction* DoMathFloor(HUnaryMathOperation* instr);
  LInstruction* DoMathRound(HUnaryMathOperation* instr);
  LInstruction* DoMathFround(HUnaryMathOperation* instr);
  LInstruction* DoMathAbs(HUnaryMathOperation* instr);
  LInstruction* DoMathLog(HUnaryMathOperation* instr);
  LInstruction* DoMathExp(HUnaryMathOperation* instr);
  LInstruction* DoMathSqrt(HUnaryMathOperation* instr);
  LInstruction* DoMathPowHalf(HUnaryMathOperation* instr);
  LInstruction* DoMathClz32(HUnaryMathOperation* instr);
  LInstruction* DoDivByPowerOf2I(HDiv* instr);
  LInstruction* DoDivByConstI(HDiv* instr);
  LInstruction* DoDivI(HDiv* instr);
  LInstruction* DoModByPowerOf2I(HMod* instr);
  LInstruction* DoModByConstI(HMod* instr);
  LInstruction* DoModI(HMod* instr);
  LInstruction* DoFlooringDivByPowerOf2I(HMathFloorOfDiv* instr);
  LInstruction* DoFlooringDivByConstI(HMathFloorOfDiv* instr);
  LInstruction* DoFlooringDivI(HMathFloorOfDiv* instr);
 
 private:
  // Methods for getting operands for Use / Define / Temp.
  LUnallocated* ToUnallocated(Register reg);
  LUnallocated* ToUnallocated(DoubleRegister reg);
 
  // Methods for setting up define-use relationships.
  MUST_USE_RESULT LOperand* Use(HValue* value, LUnallocated* operand);
  MUST_USE_RESULT LOperand* UseFixed(HValue* value, Register fixed_register);
  MUST_USE_RESULT LOperand* UseFixedDouble(HValue* value,
                                           DoubleRegister fixed_register);
 
  // A value that is guaranteed to be allocated to a register.
  // Operand created by UseRegister is guaranteed to be live until the end of
  // instruction. This means that register allocator will not reuse it's
  // register for any other operand inside instruction.
  // Operand created by UseRegisterAtStart is guaranteed to be live only at
  // instruction start. Register allocator is free to assign the same register
  // to some other operand used inside instruction (i.e. temporary or
  // output).
  MUST_USE_RESULT LOperand* UseRegister(HValue* value);
  MUST_USE_RESULT LOperand* UseRegisterAtStart(HValue* value);
 
  // An input operand in a register that may be trashed.
  MUST_USE_RESULT LOperand* UseTempRegister(HValue* value);
 
  // An input operand in a register or stack slot.
  MUST_USE_RESULT LOperand* Use(HValue* value);
  MUST_USE_RESULT LOperand* UseAtStart(HValue* value);
 
  // An input operand in a register, stack slot or a constant operand.
  MUST_USE_RESULT LOperand* UseOrConstant(HValue* value);
  MUST_USE_RESULT LOperand* UseOrConstantAtStart(HValue* value);
 
  // An input operand in a register or a constant operand.
  MUST_USE_RESULT LOperand* UseRegisterOrConstant(HValue* value);
  MUST_USE_RESULT LOperand* UseRegisterOrConstantAtStart(HValue* value);
 
  // An input operand in a constant operand.
  MUST_USE_RESULT LOperand* UseConstant(HValue* value);
 
  // An input operand in register, stack slot or a constant operand.
  // Will not be moved to a register even if one is freely available.
  virtual MUST_USE_RESULT LOperand* UseAny(HValue* value) OVERRIDE;
 
  // Temporary operand that must be in a register.
  MUST_USE_RESULT LUnallocated* TempRegister();
  MUST_USE_RESULT LUnallocated* TempDoubleRegister();
  MUST_USE_RESULT LOperand* FixedTemp(Register reg);
  MUST_USE_RESULT LOperand* FixedTemp(DoubleRegister reg);
 
  // Methods for setting up define-use relationships.
  // Return the same instruction that they are passed.
  LInstruction* Define(LTemplateResultInstruction<1>* instr,
                       LUnallocated* result);
  LInstruction* DefineAsRegister(LTemplateResultInstruction<1>* instr);
  LInstruction* DefineAsSpilled(LTemplateResultInstruction<1>* instr,
                                int index);
  LInstruction* DefineSameAsFirst(LTemplateResultInstruction<1>* instr);
  LInstruction* DefineFixed(LTemplateResultInstruction<1>* instr,
                            Register reg);
  LInstruction* DefineFixedDouble(LTemplateResultInstruction<1>* instr,
                                  DoubleRegister reg);
  LInstruction* AssignEnvironment(LInstruction* instr);
  LInstruction* AssignPointerMap(LInstruction* instr);
 
  enum CanDeoptimize { CAN_DEOPTIMIZE_EAGERLY, CANNOT_DEOPTIMIZE_EAGERLY };
 
  // By default we assume that instruction sequences generated for calls
  // cannot deoptimize eagerly and we do not attach environment to this
  // instruction.
  LInstruction* MarkAsCall(
      LInstruction* instr,
      HInstruction* hinstr,
      CanDeoptimize can_deoptimize = CANNOT_DEOPTIMIZE_EAGERLY);
 
  void VisitInstruction(HInstruction* current);
  void AddInstruction(LInstruction* instr, HInstruction* current);
 
  void DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block);
  LInstruction* DoBit(Token::Value op, HBitwiseBinaryOperation* instr);
  LInstruction* DoShift(Token::Value op, HBitwiseBinaryOperation* instr);
  LInstruction* DoArithmeticD(Token::Value op,
                              HArithmeticBinaryOperation* instr);
  LInstruction* DoArithmeticT(Token::Value op,
                              HBinaryOperation* instr);
 
  HInstruction* current_instruction_;
  HBasicBlock* current_block_;
  HBasicBlock* next_block_;
  LAllocator* allocator_;
 
  DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
};
 
#undef DECLARE_HYDROGEN_ACCESSOR
#undef DECLARE_CONCRETE_INSTRUCTION
 
} }  // namespace v8::internal
 
#endif  // V8_MIPS_LITHIUM_MIPS_H_