Move Hydrogen and Lithium to src/crankshaft/

src/arm64/lithium-arm64.cc

-// Copyright 2013 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.
-
-#include "src/arm64/lithium-arm64.h"
-
-#include <sstream>
-
-#include "src/arm64/lithium-codegen-arm64.h"
-#include "src/hydrogen-osr.h"
-#include "src/lithium-inl.h"
-
-namespace v8 {
-namespace internal {
-
-#define DEFINE_COMPILE(type)                            \
-  void L##type::CompileToNative(LCodeGen* generator) {  \
-    generator->Do##type(this);                          \
-  }
-LITHIUM_CONCRETE_INSTRUCTION_LIST(DEFINE_COMPILE)
-#undef DEFINE_COMPILE
-
-#ifdef DEBUG
-void LInstruction::VerifyCall() {
-  // Call instructions can use only fixed registers as temporaries and
-  // outputs because all registers are blocked by the calling convention.
-  // Inputs operands must use a fixed register or use-at-start policy or
-  // a non-register policy.
-  DCHECK(Output() == NULL ||
-         LUnallocated::cast(Output())->HasFixedPolicy() ||
-         !LUnallocated::cast(Output())->HasRegisterPolicy());
-  for (UseIterator it(this); !it.Done(); it.Advance()) {
-    LUnallocated* operand = LUnallocated::cast(it.Current());
-    DCHECK(operand->HasFixedPolicy() ||
-           operand->IsUsedAtStart());
-  }
-  for (TempIterator it(this); !it.Done(); it.Advance()) {
-    LUnallocated* operand = LUnallocated::cast(it.Current());
-    DCHECK(operand->HasFixedPolicy() ||!operand->HasRegisterPolicy());
-  }
-}
-#endif
-
-
-void LLabel::PrintDataTo(StringStream* stream) {
-  LGap::PrintDataTo(stream);
-  LLabel* rep = replacement();
-  if (rep != NULL) {
-    stream->Add(" Dead block replaced with B%d", rep->block_id());
-  }
-}
-
-
-void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
-  arguments()->PrintTo(stream);
-  stream->Add(" length ");
-  length()->PrintTo(stream);
-  stream->Add(" index ");
-  index()->PrintTo(stream);
-}
-
-
-void LBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("B%d | B%d on ", true_block_id(), false_block_id());
-  value()->PrintTo(stream);
-}
-
-
-void LCallJSFunction::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  function()->PrintTo(stream);
-  stream->Add("#%d / ", arity());
-}
-
-
-void LCallWithDescriptor::PrintDataTo(StringStream* stream) {
-  for (int i = 0; i < InputCount(); i++) {
-    InputAt(i)->PrintTo(stream);
-    stream->Add(" ");
-  }
-  stream->Add("#%d / ", arity());
-}
-
-
-void LCallNew::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  constructor()->PrintTo(stream);
-  stream->Add(" #%d / ", arity());
-}
-
-
-void LCallNewArray::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  constructor()->PrintTo(stream);
-  stream->Add(" #%d / ", arity());
-  ElementsKind kind = hydrogen()->elements_kind();
-  stream->Add(" (%s) ", ElementsKindToString(kind));
-}
-
-
-void LClassOfTestAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if class_of_test(");
-  value()->PrintTo(stream);
-  stream->Add(", \"%o\") then B%d else B%d",
-              *hydrogen()->class_name(),
-              true_block_id(),
-              false_block_id());
-}
-
-
-void LCompareNumericAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if ");
-  left()->PrintTo(stream);
-  stream->Add(" %s ", Token::String(op()));
-  right()->PrintTo(stream);
-  stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
-void LHasCachedArrayIndexAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if has_cached_array_index(");
-  value()->PrintTo(stream);
-  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
-bool LGoto::HasInterestingComment(LCodeGen* gen) const {
-  return !gen->IsNextEmittedBlock(block_id());
-}
-
-
-void LGoto::PrintDataTo(StringStream* stream) {
-  stream->Add("B%d", block_id());
-}
-
-
-void LInnerAllocatedObject::PrintDataTo(StringStream* stream) {
-  stream->Add(" = ");
-  base_object()->PrintTo(stream);
-  stream->Add(" + ");
-  offset()->PrintTo(stream);
-}
-
-
-void LCallFunction::PrintDataTo(StringStream* stream) {
-  context()->PrintTo(stream);
-  stream->Add(" ");
-  function()->PrintTo(stream);
-  if (hydrogen()->HasVectorAndSlot()) {
-    stream->Add(" (type-feedback-vector ");
-    temp_vector()->PrintTo(stream);
-    stream->Add(" ");
-    temp_slot()->PrintTo(stream);
-    stream->Add(")");
-  }
-}
-
-
-void LInvokeFunction::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  function()->PrintTo(stream);
-  stream->Add(" #%d / ", arity());
-}
-
-
-void LInstruction::PrintTo(StringStream* stream) {
-  stream->Add("%s ", this->Mnemonic());
-
-  PrintOutputOperandTo(stream);
-
-  PrintDataTo(stream);
-
-  if (HasEnvironment()) {
-    stream->Add(" ");
-    environment()->PrintTo(stream);
-  }
-
-  if (HasPointerMap()) {
-    stream->Add(" ");
-    pointer_map()->PrintTo(stream);
-  }
-}
-
-
-void LInstruction::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  for (int i = 0; i < InputCount(); i++) {
-    if (i > 0) stream->Add(" ");
-    if (InputAt(i) == NULL) {
-      stream->Add("NULL");
-    } else {
-      InputAt(i)->PrintTo(stream);
-    }
-  }
-}
-
-
-void LInstruction::PrintOutputOperandTo(StringStream* stream) {
-  if (HasResult()) result()->PrintTo(stream);
-}
-
-
-void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if has_instance_type(");
-  value()->PrintTo(stream);
-  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
-void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if is_string(");
-  value()->PrintTo(stream);
-  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
-void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if is_smi(");
-  value()->PrintTo(stream);
-  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
-void LTypeofIsAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if typeof ");
-  value()->PrintTo(stream);
-  stream->Add(" == \"%s\" then B%d else B%d",
-              hydrogen()->type_literal()->ToCString().get(),
-              true_block_id(), false_block_id());
-}
-
-
-void LIsUndetectableAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if is_undetectable(");
-  value()->PrintTo(stream);
-  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
-bool LGap::IsRedundant() const {
-  for (int i = 0; i < 4; i++) {
-    if ((parallel_moves_[i] != NULL) && !parallel_moves_[i]->IsRedundant()) {
-      return false;
-    }
-  }
-
-  return true;
-}
-
-
-void LGap::PrintDataTo(StringStream* stream) {
-  for (int i = 0; i < 4; i++) {
-    stream->Add("(");
-    if (parallel_moves_[i] != NULL) {
-      parallel_moves_[i]->PrintDataTo(stream);
-    }
-    stream->Add(") ");
-  }
-}
-
-
-void LLoadContextSlot::PrintDataTo(StringStream* stream) {
-  context()->PrintTo(stream);
-  stream->Add("[%d]", slot_index());
-}
-
-
-void LStoreCodeEntry::PrintDataTo(StringStream* stream) {
-  stream->Add(" = ");
-  function()->PrintTo(stream);
-  stream->Add(".code_entry = ");
-  code_object()->PrintTo(stream);
-}
-
-
-void LStoreContextSlot::PrintDataTo(StringStream* stream) {
-  context()->PrintTo(stream);
-  stream->Add("[%d] <- ", slot_index());
-  value()->PrintTo(stream);
-}
-
-
-void LStoreKeyedGeneric::PrintDataTo(StringStream* stream) {
-  object()->PrintTo(stream);
-  stream->Add("[");
-  key()->PrintTo(stream);
-  stream->Add("] <- ");
-  value()->PrintTo(stream);
-}
-
-
-void LLoadGlobalViaContext::PrintDataTo(StringStream* stream) {
-  stream->Add("depth:%d slot:%d", depth(), slot_index());
-}
-
-
-void LStoreNamedField::PrintDataTo(StringStream* stream) {
-  object()->PrintTo(stream);
-  std::ostringstream os;
-  os << hydrogen()->access();
-  stream->Add(os.str().c_str());
-  stream->Add(" <- ");
-  value()->PrintTo(stream);
-}
-
-
-void LStoreNamedGeneric::PrintDataTo(StringStream* stream) {
-  object()->PrintTo(stream);
-  stream->Add(".");
-  stream->Add(String::cast(*name())->ToCString().get());
-  stream->Add(" <- ");
-  value()->PrintTo(stream);
-}
-
-
-void LStoreGlobalViaContext::PrintDataTo(StringStream* stream) {
-  stream->Add("depth:%d slot:%d <- ", depth(), slot_index());
-  value()->PrintTo(stream);
-}
-
-
-void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if string_compare(");
-  left()->PrintTo(stream);
-  right()->PrintTo(stream);
-  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
-void LTransitionElementsKind::PrintDataTo(StringStream* stream) {
-  object()->PrintTo(stream);
-  stream->Add("%p -> %p", *original_map(), *transitioned_map());
-}
-
-
-template<int T>
-void LUnaryMathOperation<T>::PrintDataTo(StringStream* stream) {
-  value()->PrintTo(stream);
-}
-
-
-const char* LArithmeticD::Mnemonic() const {
-  switch (op()) {
-    case Token::ADD: return "add-d";
-    case Token::SUB: return "sub-d";
-    case Token::MUL: return "mul-d";
-    case Token::DIV: return "div-d";
-    case Token::MOD: return "mod-d";
-    default:
-      UNREACHABLE();
-      return NULL;
-  }
-}
-
-
-const char* LArithmeticT::Mnemonic() const {
-  switch (op()) {
-    case Token::ADD: return "add-t";
-    case Token::SUB: return "sub-t";
-    case Token::MUL: return "mul-t";
-    case Token::MOD: return "mod-t";
-    case Token::DIV: return "div-t";
-    case Token::BIT_AND: return "bit-and-t";
-    case Token::BIT_OR: return "bit-or-t";
-    case Token::BIT_XOR: return "bit-xor-t";
-    case Token::ROR: return "ror-t";
-    case Token::SHL: return "shl-t";
-    case Token::SAR: return "sar-t";
-    case Token::SHR: return "shr-t";
-    default:
-      UNREACHABLE();
-      return NULL;
-  }
-}
-
-
-LUnallocated* LChunkBuilder::ToUnallocated(Register reg) {
-  return new (zone()) LUnallocated(LUnallocated::FIXED_REGISTER, reg.code());
-}
-
-
-LUnallocated* LChunkBuilder::ToUnallocated(DoubleRegister reg) {
-  return new (zone())
-      LUnallocated(LUnallocated::FIXED_DOUBLE_REGISTER, reg.code());
-}
-
-
-LOperand* LChunkBuilder::Use(HValue* value, LUnallocated* operand) {
-  if (value->EmitAtUses()) {
-    HInstruction* instr = HInstruction::cast(value);
-    VisitInstruction(instr);
-  }
-  operand->set_virtual_register(value->id());
-  return operand;
-}
-
-
-LOperand* LChunkBuilder::UseFixed(HValue* value, Register fixed_register) {
-  return Use(value, ToUnallocated(fixed_register));
-}
-
-
-LOperand* LChunkBuilder::UseFixedDouble(HValue* value,
-                                        DoubleRegister fixed_register) {
-  return Use(value, ToUnallocated(fixed_register));
-}
-
-
-LOperand* LChunkBuilder::UseRegister(HValue* value) {
-  return Use(value, new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
-}
-
-
-LOperand* LChunkBuilder::UseRegisterAndClobber(HValue* value) {
-  return Use(value, new(zone()) LUnallocated(LUnallocated::WRITABLE_REGISTER));
-}
-
-
-LOperand* LChunkBuilder::UseRegisterAtStart(HValue* value) {
-  return Use(value,
-             new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER,
-                                      LUnallocated::USED_AT_START));
-}
-
-
-LOperand* LChunkBuilder::UseRegisterOrConstant(HValue* value) {
-  return value->IsConstant() ? UseConstant(value) : UseRegister(value);
-}
-
-
-LOperand* LChunkBuilder::UseRegisterOrConstantAtStart(HValue* value) {
-  return value->IsConstant() ? UseConstant(value) : UseRegisterAtStart(value);
-}
-
-
-LConstantOperand* LChunkBuilder::UseConstant(HValue* value) {
-  return chunk_->DefineConstantOperand(HConstant::cast(value));
-}
-
-
-LOperand* LChunkBuilder::UseAny(HValue* value) {
-  return value->IsConstant()
-      ? UseConstant(value)
-      : Use(value, new(zone()) LUnallocated(LUnallocated::ANY));
-}
-
-
-LInstruction* LChunkBuilder::Define(LTemplateResultInstruction<1>* instr,
-                                    LUnallocated* result) {
-  result->set_virtual_register(current_instruction_->id());
-  instr->set_result(result);
-  return instr;
-}
-
-
-LInstruction* LChunkBuilder::DefineAsRegister(
-    LTemplateResultInstruction<1>* instr) {
-  return Define(instr,
-                new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
-}
-
-
-LInstruction* LChunkBuilder::DefineAsSpilled(
-    LTemplateResultInstruction<1>* instr, int index) {
-  return Define(instr,
-                new(zone()) LUnallocated(LUnallocated::FIXED_SLOT, index));
-}
-
-
-LInstruction* LChunkBuilder::DefineSameAsFirst(
-    LTemplateResultInstruction<1>* instr) {
-  return Define(instr,
-                new(zone()) LUnallocated(LUnallocated::SAME_AS_FIRST_INPUT));
-}
-
-
-LInstruction* LChunkBuilder::DefineFixed(
-    LTemplateResultInstruction<1>* instr, Register reg) {
-  return Define(instr, ToUnallocated(reg));
-}
-
-
-LInstruction* LChunkBuilder::DefineFixedDouble(
-    LTemplateResultInstruction<1>* instr, DoubleRegister reg) {
-  return Define(instr, ToUnallocated(reg));
-}
-
-
-LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
-                                        HInstruction* hinstr,
-                                        CanDeoptimize can_deoptimize) {
-  info()->MarkAsNonDeferredCalling();
-#ifdef DEBUG
-  instr->VerifyCall();
-#endif
-  instr->MarkAsCall();
-  instr = AssignPointerMap(instr);
-
-  // If instruction does not have side-effects lazy deoptimization
-  // after the call will try to deoptimize to the point before the call.
-  // Thus we still need to attach environment to this call even if
-  // call sequence can not deoptimize eagerly.
-  bool needs_environment =
-      (can_deoptimize == CAN_DEOPTIMIZE_EAGERLY) ||
-      !hinstr->HasObservableSideEffects();
-  if (needs_environment && !instr->HasEnvironment()) {
-    instr = AssignEnvironment(instr);
-    // We can't really figure out if the environment is needed or not.
-    instr->environment()->set_has_been_used();
-  }
-
-  return instr;
-}
-
-
-LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
-  DCHECK(!instr->HasPointerMap());
-  instr->set_pointer_map(new(zone()) LPointerMap(zone()));
-  return instr;
-}
-
-
-LUnallocated* LChunkBuilder::TempRegister() {
-  LUnallocated* operand =
-      new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER);
-  int vreg = allocator_->GetVirtualRegister();
-  if (!allocator_->AllocationOk()) {
-    Abort(kOutOfVirtualRegistersWhileTryingToAllocateTempRegister);
-    vreg = 0;
-  }
-  operand->set_virtual_register(vreg);
-  return operand;
-}
-
-
-LUnallocated* LChunkBuilder::TempDoubleRegister() {
-  LUnallocated* operand =
-      new(zone()) LUnallocated(LUnallocated::MUST_HAVE_DOUBLE_REGISTER);
-  int vreg = allocator_->GetVirtualRegister();
-  if (!allocator_->AllocationOk()) {
-    Abort(kOutOfVirtualRegistersWhileTryingToAllocateTempRegister);
-    vreg = 0;
-  }
-  operand->set_virtual_register(vreg);
-  return operand;
-}
-
-
-int LPlatformChunk::GetNextSpillIndex() {
-  return spill_slot_count_++;
-}
-
-
-LOperand* LPlatformChunk::GetNextSpillSlot(RegisterKind kind) {
-  int index = GetNextSpillIndex();
-  if (kind == DOUBLE_REGISTERS) {
-    return LDoubleStackSlot::Create(index, zone());
-  } else {
-    DCHECK(kind == GENERAL_REGISTERS);
-    return LStackSlot::Create(index, zone());
-  }
-}
-
-
-LOperand* LChunkBuilder::FixedTemp(Register reg) {
-  LUnallocated* operand = ToUnallocated(reg);
-  DCHECK(operand->HasFixedPolicy());
-  return operand;
-}
-
-
-LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
-  LUnallocated* operand = ToUnallocated(reg);
-  DCHECK(operand->HasFixedPolicy());
-  return operand;
-}
-
-
-LPlatformChunk* LChunkBuilder::Build() {
-  DCHECK(is_unused());
-  chunk_ = new(zone()) LPlatformChunk(info_, graph_);
-  LPhase phase("L_Building chunk", chunk_);
-  status_ = BUILDING;
-
-  // If compiling for OSR, reserve space for the unoptimized frame,
-  // which will be subsumed into this frame.
-  if (graph()->has_osr()) {
-    // TODO(all): GetNextSpillIndex just increments a field. It has no other
-    // side effects, so we should get rid of this loop.
-    for (int i = graph()->osr()->UnoptimizedFrameSlots(); i > 0; i--) {
-      chunk_->GetNextSpillIndex();
-    }
-  }
-
-  const ZoneList<HBasicBlock*>* blocks = graph_->blocks();
-  for (int i = 0; i < blocks->length(); i++) {
-    DoBasicBlock(blocks->at(i));
-    if (is_aborted()) return NULL;
-  }
-  status_ = DONE;
-  return chunk_;
-}
-
-
-void LChunkBuilder::DoBasicBlock(HBasicBlock* block) {
-  DCHECK(is_building());
-  current_block_ = block;
-
-  if (block->IsStartBlock()) {
-    block->UpdateEnvironment(graph_->start_environment());
-    argument_count_ = 0;
-  } else if (block->predecessors()->length() == 1) {
-    // We have a single predecessor => copy environment and outgoing
-    // argument count from the predecessor.
-    DCHECK(block->phis()->length() == 0);
-    HBasicBlock* pred = block->predecessors()->at(0);
-    HEnvironment* last_environment = pred->last_environment();
-    DCHECK(last_environment != NULL);
-
-    // Only copy the environment, if it is later used again.
-    if (pred->end()->SecondSuccessor() == NULL) {
-      DCHECK(pred->end()->FirstSuccessor() == block);
-    } else {
-      if ((pred->end()->FirstSuccessor()->block_id() > block->block_id()) ||
-          (pred->end()->SecondSuccessor()->block_id() > block->block_id())) {
-        last_environment = last_environment->Copy();
-      }
-    }
-    block->UpdateEnvironment(last_environment);
-    DCHECK(pred->argument_count() >= 0);
-    argument_count_ = pred->argument_count();
-  } else {
-    // We are at a state join => process phis.
-    HBasicBlock* pred = block->predecessors()->at(0);
-    // No need to copy the environment, it cannot be used later.
-    HEnvironment* last_environment = pred->last_environment();
-    for (int i = 0; i < block->phis()->length(); ++i) {
-      HPhi* phi = block->phis()->at(i);
-      if (phi->HasMergedIndex()) {
-        last_environment->SetValueAt(phi->merged_index(), phi);
-      }
-    }
-    for (int i = 0; i < block->deleted_phis()->length(); ++i) {
-      if (block->deleted_phis()->at(i) < last_environment->length()) {
-        last_environment->SetValueAt(block->deleted_phis()->at(i),
-                                     graph_->GetConstantUndefined());
-      }
-    }
-    block->UpdateEnvironment(last_environment);
-    // Pick up the outgoing argument count of one of the predecessors.
-    argument_count_ = pred->argument_count();
-  }
-
-  // Translate hydrogen instructions to lithium ones for the current block.
-  HInstruction* current = block->first();
-  int start = chunk_->instructions()->length();
-  while ((current != NULL) && !is_aborted()) {
-    // Code for constants in registers is generated lazily.
-    if (!current->EmitAtUses()) {
-      VisitInstruction(current);
-    }
-    current = current->next();
-  }
-  int end = chunk_->instructions()->length() - 1;
-  if (end >= start) {
-    block->set_first_instruction_index(start);
-    block->set_last_instruction_index(end);
-  }
-  block->set_argument_count(argument_count_);
-  current_block_ = NULL;
-}
-
-
-void LChunkBuilder::VisitInstruction(HInstruction* current) {
-  HInstruction* old_current = current_instruction_;
-  current_instruction_ = current;
-
-  LInstruction* instr = NULL;
-  if (current->CanReplaceWithDummyUses()) {
-    if (current->OperandCount() == 0) {
-      instr = DefineAsRegister(new(zone()) LDummy());
-    } else {
-      DCHECK(!current->OperandAt(0)->IsControlInstruction());
-      instr = DefineAsRegister(new(zone())
-          LDummyUse(UseAny(current->OperandAt(0))));
-    }
-    for (int i = 1; i < current->OperandCount(); ++i) {
-      if (current->OperandAt(i)->IsControlInstruction()) continue;
-      LInstruction* dummy =
-          new(zone()) LDummyUse(UseAny(current->OperandAt(i)));
-      dummy->set_hydrogen_value(current);
-      chunk_->AddInstruction(dummy, current_block_);
-    }
-  } else {
-    HBasicBlock* successor;
-    if (current->IsControlInstruction() &&
-        HControlInstruction::cast(current)->KnownSuccessorBlock(&successor) &&
-        successor != NULL) {
-      instr = new(zone()) LGoto(successor);
-    } else {
-      instr = current->CompileToLithium(this);
-    }
-  }
-
-  argument_count_ += current->argument_delta();
-  DCHECK(argument_count_ >= 0);
-
-  if (instr != NULL) {
-    AddInstruction(instr, current);
-  }
-
-  current_instruction_ = old_current;
-}
-
-
-void LChunkBuilder::AddInstruction(LInstruction* instr,
-                                   HInstruction* hydrogen_val) {
-  // Associate the hydrogen instruction first, since we may need it for
-  // the ClobbersRegisters() or ClobbersDoubleRegisters() calls below.
-  instr->set_hydrogen_value(hydrogen_val);
-
-#if DEBUG
-  // Make sure that the lithium instruction has either no fixed register
-  // constraints in temps or the result OR no uses that are only used at
-  // start. If this invariant doesn't hold, the register allocator can decide
-  // to insert a split of a range immediately before the instruction due to an
-  // already allocated register needing to be used for the instruction's fixed
-  // register constraint. In this case, the register allocator won't see an
-  // interference between the split child and the use-at-start (it would if
-  // the it was just a plain use), so it is free to move the split child into
-  // the same register that is used for the use-at-start.
-  // See https://code.google.com/p/chromium/issues/detail?id=201590
-  if (!(instr->ClobbersRegisters() &&
-        instr->ClobbersDoubleRegisters(isolate()))) {
-    int fixed = 0;
-    int used_at_start = 0;
-    for (UseIterator it(instr); !it.Done(); it.Advance()) {
-      LUnallocated* operand = LUnallocated::cast(it.Current());
-      if (operand->IsUsedAtStart()) ++used_at_start;
-    }
-    if (instr->Output() != NULL) {
-      if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed;
-    }
-    for (TempIterator it(instr); !it.Done(); it.Advance()) {
-      LUnallocated* operand = LUnallocated::cast(it.Current());
-      if (operand->HasFixedPolicy()) ++fixed;
-    }
-    DCHECK(fixed == 0 || used_at_start == 0);
-  }
-#endif
-
-  if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
-    instr = AssignPointerMap(instr);
-  }
-  if (FLAG_stress_environments && !instr->HasEnvironment()) {
-    instr = AssignEnvironment(instr);
-  }
-  chunk_->AddInstruction(instr, current_block_);
-
-  if (instr->IsCall() || instr->IsPrologue()) {
-    HValue* hydrogen_value_for_lazy_bailout = hydrogen_val;
-    if (hydrogen_val->HasObservableSideEffects()) {
-      HSimulate* sim = HSimulate::cast(hydrogen_val->next());
-      sim->ReplayEnvironment(current_block_->last_environment());
-      hydrogen_value_for_lazy_bailout = sim;
-    }
-    LInstruction* bailout = AssignEnvironment(new(zone()) LLazyBailout());
-    bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
-    chunk_->AddInstruction(bailout, current_block_);
-  }
-}
-
-
-LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
-  HEnvironment* hydrogen_env = current_block_->last_environment();
-  int argument_index_accumulator = 0;
-  ZoneList<HValue*> objects_to_materialize(0, zone());
-  instr->set_environment(CreateEnvironment(hydrogen_env,
-                                           &argument_index_accumulator,
-                                           &objects_to_materialize));
-  return instr;
-}
-
-
-LInstruction* LChunkBuilder::DoPrologue(HPrologue* instr) {
-  return new (zone()) LPrologue();
-}
-
-
-LInstruction* LChunkBuilder::DoAbnormalExit(HAbnormalExit* instr) {
-  // The control instruction marking the end of a block that completed
-  // abruptly (e.g., threw an exception). There is nothing specific to do.
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
-                                           HArithmeticBinaryOperation* instr) {
-  DCHECK(instr->representation().IsDouble());
-  DCHECK(instr->left()->representation().IsDouble());
-  DCHECK(instr->right()->representation().IsDouble());
-
-  if (op == Token::MOD) {
-    LOperand* left = UseFixedDouble(instr->left(), d0);
-    LOperand* right = UseFixedDouble(instr->right(), d1);
-    LArithmeticD* result = new(zone()) LArithmeticD(Token::MOD, left, right);
-    return MarkAsCall(DefineFixedDouble(result, d0), instr);
-  } else {
-    LOperand* left = UseRegisterAtStart(instr->left());
-    LOperand* right = UseRegisterAtStart(instr->right());
-    LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
-    return DefineAsRegister(result);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
-                                           HBinaryOperation* instr) {
-  DCHECK((op == Token::ADD) || (op == Token::SUB) || (op == Token::MUL) ||
-         (op == Token::DIV) || (op == Token::MOD) || (op == Token::SHR) ||
-         (op == Token::SHL) || (op == Token::SAR) || (op == Token::ROR) ||
-         (op == Token::BIT_OR) || (op == Token::BIT_AND) ||
-         (op == Token::BIT_XOR));
-  HValue* left = instr->left();
-  HValue* right = instr->right();
-
-  // TODO(jbramley): Once we've implemented smi support for all arithmetic
-  // operations, these assertions should check IsTagged().
-  DCHECK(instr->representation().IsSmiOrTagged());
-  DCHECK(left->representation().IsSmiOrTagged());
-  DCHECK(right->representation().IsSmiOrTagged());
-
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* left_operand = UseFixed(left, x1);
-  LOperand* right_operand = UseFixed(right, x0);
-  LArithmeticT* result =
-      new(zone()) LArithmeticT(op, context, left_operand, right_operand);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoBoundsCheckBaseIndexInformation(
-    HBoundsCheckBaseIndexInformation* instr) {
-  UNREACHABLE();
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
-  info()->MarkAsRequiresFrame();
-  LOperand* args = NULL;
-  LOperand* length = NULL;
-  LOperand* index = NULL;
-
-  if (instr->length()->IsConstant() && instr->index()->IsConstant()) {
-    args = UseRegisterAtStart(instr->arguments());
-    length = UseConstant(instr->length());
-    index = UseConstant(instr->index());
-  } else {
-    args = UseRegister(instr->arguments());
-    length = UseRegisterAtStart(instr->length());
-    index = UseRegisterOrConstantAtStart(instr->index());
-  }
-
-  return DefineAsRegister(new(zone()) LAccessArgumentsAt(args, length, index));
-}
-
-
-LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    DCHECK(instr->left()->representation().Equals(instr->representation()));
-    DCHECK(instr->right()->representation().Equals(instr->representation()));
-
-    LInstruction* shifted_operation = TryDoOpWithShiftedRightOperand(instr);
-    if (shifted_operation != NULL) {
-      return shifted_operation;
-    }
-
-    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
-    LOperand* right =
-        UseRegisterOrConstantAtStart(instr->BetterRightOperand());
-    LInstruction* result = instr->representation().IsSmi() ?
-        DefineAsRegister(new(zone()) LAddS(left, right)) :
-        DefineAsRegister(new(zone()) LAddI(left, right));
-    if (instr->CheckFlag(HValue::kCanOverflow)) {
-      result = AssignEnvironment(result);
-    }
-    return result;
-  } else if (instr->representation().IsExternal()) {
-    DCHECK(instr->IsConsistentExternalRepresentation());
-    DCHECK(!instr->CheckFlag(HValue::kCanOverflow));
-    LOperand* left = UseRegisterAtStart(instr->left());
-    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-    return DefineAsRegister(new(zone()) LAddE(left, right));
-  } else if (instr->representation().IsDouble()) {
-    return DoArithmeticD(Token::ADD, instr);
-  } else {
-    DCHECK(instr->representation().IsTagged());
-    return DoArithmeticT(Token::ADD, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoAllocate(HAllocate* instr) {
-  info()->MarkAsDeferredCalling();
-  LOperand* context = UseAny(instr->context());
-  LOperand* size = UseRegisterOrConstant(instr->size());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LOperand* temp3 = instr->MustPrefillWithFiller() ? TempRegister() : NULL;
-  LAllocate* result = new(zone()) LAllocate(context, size, temp1, temp2, temp3);
-  return AssignPointerMap(DefineAsRegister(result));
-}
-
-
-LInstruction* LChunkBuilder::DoApplyArguments(HApplyArguments* instr) {
-  LOperand* function = UseFixed(instr->function(), x1);
-  LOperand* receiver = UseFixed(instr->receiver(), x0);
-  LOperand* length = UseFixed(instr->length(), x2);
-  LOperand* elements = UseFixed(instr->elements(), x3);
-  LApplyArguments* result = new(zone()) LApplyArguments(function,
-                                                        receiver,
-                                                        length,
-                                                        elements);
-  return MarkAsCall(DefineFixed(result, x0), instr, CAN_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* instr) {
-  info()->MarkAsRequiresFrame();
-  LOperand* temp = instr->from_inlined() ? NULL : TempRegister();
-  return DefineAsRegister(new(zone()) LArgumentsElements(temp));
-}
-
-
-LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* instr) {
-  info()->MarkAsRequiresFrame();
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LArgumentsLength(value));
-}
-
-
-LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
-  // There are no real uses of the arguments object.
-  // arguments.length and element access are supported directly on
-  // stack arguments, and any real arguments object use causes a bailout.
-  // So this value is never used.
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoBitwise(HBitwise* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    DCHECK(instr->left()->representation().Equals(instr->representation()));
-    DCHECK(instr->right()->representation().Equals(instr->representation()));
-    DCHECK(instr->CheckFlag(HValue::kTruncatingToInt32));
-
-    LInstruction* shifted_operation = TryDoOpWithShiftedRightOperand(instr);
-    if (shifted_operation != NULL) {
-      return shifted_operation;
-    }
-
-    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
-    LOperand* right =
-        UseRegisterOrConstantAtStart(instr->BetterRightOperand());
-    return instr->representation().IsSmi() ?
-        DefineAsRegister(new(zone()) LBitS(left, right)) :
-        DefineAsRegister(new(zone()) LBitI(left, right));
-  } else {
-    return DoArithmeticT(instr->op(), instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
-  // V8 expects a label to be generated for each basic block.
-  // This is used in some places like LAllocator::IsBlockBoundary
-  // in lithium-allocator.cc
-  return new(zone()) LLabel(instr->block());
-}
-
-
-LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
-  if (!FLAG_debug_code && instr->skip_check()) return NULL;
-  LOperand* index = UseRegisterOrConstantAtStart(instr->index());
-  LOperand* length = !index->IsConstantOperand()
-      ? UseRegisterOrConstantAtStart(instr->length())
-      : UseRegisterAtStart(instr->length());
-  LInstruction* result = new(zone()) LBoundsCheck(index, length);
-  if (!FLAG_debug_code || !instr->skip_check()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
-  HValue* value = instr->value();
-  Representation r = value->representation();
-  HType type = value->type();
-
-  if (r.IsInteger32() || r.IsSmi() || r.IsDouble()) {
-    // These representations have simple checks that cannot deoptimize.
-    return new(zone()) LBranch(UseRegister(value), NULL, NULL);
-  } else {
-    DCHECK(r.IsTagged());
-    if (type.IsBoolean() || type.IsSmi() || type.IsJSArray() ||
-        type.IsHeapNumber()) {
-      // These types have simple checks that cannot deoptimize.
-      return new(zone()) LBranch(UseRegister(value), NULL, NULL);
-    }
-
-    if (type.IsString()) {
-      // This type cannot deoptimize, but needs a scratch register.
-      return new(zone()) LBranch(UseRegister(value), TempRegister(), NULL);
-    }
-
-    ToBooleanStub::Types expected = instr->expected_input_types();
-    bool needs_temps = expected.NeedsMap() || expected.IsEmpty();
-    LOperand* temp1 = needs_temps ? TempRegister() : NULL;
-    LOperand* temp2 = needs_temps ? TempRegister() : NULL;
-
-    if (expected.IsGeneric() || expected.IsEmpty()) {
-      // The generic case cannot deoptimize because it already supports every
-      // possible input type.
-      DCHECK(needs_temps);
-      return new(zone()) LBranch(UseRegister(value), temp1, temp2);
-    } else {
-      return AssignEnvironment(
-          new(zone()) LBranch(UseRegister(value), temp1, temp2));
-    }
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoCallJSFunction(
-    HCallJSFunction* instr) {
-  LOperand* function = UseFixed(instr->function(), x1);
-
-  LCallJSFunction* result = new(zone()) LCallJSFunction(function);
-
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCallWithDescriptor(
-    HCallWithDescriptor* instr) {
-  CallInterfaceDescriptor descriptor = instr->descriptor();
-
-  LOperand* target = UseRegisterOrConstantAtStart(instr->target());
-  ZoneList<LOperand*> ops(instr->OperandCount(), zone());
-  // Target
-  ops.Add(target, zone());
-  // Context
-  LOperand* op = UseFixed(instr->OperandAt(1), cp);
-  ops.Add(op, zone());
-  // Other register parameters
-  for (int i = LCallWithDescriptor::kImplicitRegisterParameterCount;
-       i < instr->OperandCount(); i++) {
-    op =
-        UseFixed(instr->OperandAt(i),
-                 descriptor.GetRegisterParameter(
-                     i - LCallWithDescriptor::kImplicitRegisterParameterCount));
-    ops.Add(op, zone());
-  }
-
-  LCallWithDescriptor* result = new(zone()) LCallWithDescriptor(descriptor,
-                                                                ops,
-                                                                zone());
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCallFunction(HCallFunction* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* function = UseFixed(instr->function(), x1);
-  LOperand* slot = NULL;
-  LOperand* vector = NULL;
-  if (instr->HasVectorAndSlot()) {
-    slot = FixedTemp(x3);
-    vector = FixedTemp(x2);
-  }
-
-  LCallFunction* call =
-      new (zone()) LCallFunction(context, function, slot, vector);
-  return MarkAsCall(DefineFixed(call, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCallNew(HCallNew* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  // The call to CallConstructStub will expect the constructor to be in x1.
-  LOperand* constructor = UseFixed(instr->constructor(), x1);
-  LCallNew* result = new(zone()) LCallNew(context, constructor);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCallNewArray(HCallNewArray* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  // The call to ArrayConstructCode will expect the constructor to be in x1.
-  LOperand* constructor = UseFixed(instr->constructor(), x1);
-  LCallNewArray* result = new(zone()) LCallNewArray(context, constructor);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(DefineFixed(new(zone()) LCallRuntime(context), x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(DefineFixed(new(zone()) LCallStub(context), x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCapturedObject(HCapturedObject* instr) {
-  instr->ReplayEnvironment(current_block_->last_environment());
-
-  // There are no real uses of a captured object.
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoChange(HChange* instr) {
-  Representation from = instr->from();
-  Representation to = instr->to();
-  HValue* val = instr->value();
-  if (from.IsSmi()) {
-    if (to.IsTagged()) {
-      LOperand* value = UseRegister(val);
-      return DefineSameAsFirst(new(zone()) LDummyUse(value));
-    }
-    from = Representation::Tagged();
-  }
-  if (from.IsTagged()) {
-    if (to.IsDouble()) {
-      LOperand* value = UseRegister(val);
-      LOperand* temp = TempRegister();
-      LInstruction* result =
-          DefineAsRegister(new(zone()) LNumberUntagD(value, temp));
-      if (!val->representation().IsSmi()) result = AssignEnvironment(result);
-      return result;
-    } else if (to.IsSmi()) {
-      LOperand* value = UseRegister(val);
-      if (val->type().IsSmi()) {
-        return DefineSameAsFirst(new(zone()) LDummyUse(value));
-      }
-      return AssignEnvironment(DefineSameAsFirst(new(zone()) LCheckSmi(value)));
-    } else {
-      DCHECK(to.IsInteger32());
-      if (val->type().IsSmi() || val->representation().IsSmi()) {
-        LOperand* value = UseRegisterAtStart(val);
-        return DefineAsRegister(new(zone()) LSmiUntag(value, false));
-      } else {
-        LOperand* value = UseRegister(val);
-        LOperand* temp1 = TempRegister();
-        LOperand* temp2 = instr->CanTruncateToInt32()
-            ? NULL : TempDoubleRegister();
-        LInstruction* result =
-            DefineAsRegister(new(zone()) LTaggedToI(value, temp1, temp2));
-        if (!val->representation().IsSmi()) result = AssignEnvironment(result);
-        return result;
-      }
-    }
-  } else if (from.IsDouble()) {
-    if (to.IsTagged()) {
-      info()->MarkAsDeferredCalling();
-      LOperand* value = UseRegister(val);
-      LOperand* temp1 = TempRegister();
-      LOperand* temp2 = TempRegister();
-      LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
-      return AssignPointerMap(DefineAsRegister(result));
-    } else {
-      DCHECK(to.IsSmi() || to.IsInteger32());
-      if (instr->CanTruncateToInt32()) {
-        LOperand* value = UseRegister(val);
-        return DefineAsRegister(new(zone()) LTruncateDoubleToIntOrSmi(value));
-      } else {
-        LOperand* value = UseRegister(val);
-        LDoubleToIntOrSmi* result = new(zone()) LDoubleToIntOrSmi(value);
-        return AssignEnvironment(DefineAsRegister(result));
-      }
-    }
-  } else if (from.IsInteger32()) {
-    info()->MarkAsDeferredCalling();
-    if (to.IsTagged()) {
-      if (val->CheckFlag(HInstruction::kUint32)) {
-        LOperand* value = UseRegister(val);
-        LNumberTagU* result =
-            new(zone()) LNumberTagU(value, TempRegister(), TempRegister());
-        return AssignPointerMap(DefineAsRegister(result));
-      } else {
-        STATIC_ASSERT((kMinInt == Smi::kMinValue) &&
-                      (kMaxInt == Smi::kMaxValue));
-        LOperand* value = UseRegisterAtStart(val);
-        return DefineAsRegister(new(zone()) LSmiTag(value));
-      }
-    } else if (to.IsSmi()) {
-      LOperand* value = UseRegisterAtStart(val);
-      LInstruction* result = DefineAsRegister(new(zone()) LSmiTag(value));
-      if (instr->CheckFlag(HValue::kCanOverflow)) {
-        result = AssignEnvironment(result);
-      }
-      return result;
-    } else {
-      DCHECK(to.IsDouble());
-      if (val->CheckFlag(HInstruction::kUint32)) {
-        return DefineAsRegister(
-            new(zone()) LUint32ToDouble(UseRegisterAtStart(val)));
-      } else {
-        return DefineAsRegister(
-            new(zone()) LInteger32ToDouble(UseRegisterAtStart(val)));
-      }
-    }
-  }
-  UNREACHABLE();
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckValue(value));
-}
-
-
-LInstruction* LChunkBuilder::DoCheckArrayBufferNotNeutered(
-    HCheckArrayBufferNotNeutered* instr) {
-  LOperand* view = UseRegisterAtStart(instr->value());
-  LCheckArrayBufferNotNeutered* result =
-      new (zone()) LCheckArrayBufferNotNeutered(view);
-  return AssignEnvironment(result);
-}
-
-
-LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* temp = TempRegister();
-  LInstruction* result = new(zone()) LCheckInstanceType(value, temp);
-  return AssignEnvironment(result);
-}
-
-
-LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
-  if (instr->IsStabilityCheck()) return new(zone()) LCheckMaps;
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* temp = TempRegister();
-  LInstruction* result = AssignEnvironment(new(zone()) LCheckMaps(value, temp));
-  if (instr->HasMigrationTarget()) {
-    info()->MarkAsDeferredCalling();
-    result = AssignPointerMap(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LInstruction* result = new(zone()) LCheckNonSmi(value);
-  if (!instr->value()->type().IsHeapObject()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckSmi(value));
-}
-
-
-LInstruction* LChunkBuilder::DoClampToUint8(HClampToUint8* instr) {
-  HValue* value = instr->value();
-  Representation input_rep = value->representation();
-  LOperand* reg = UseRegister(value);
-  if (input_rep.IsDouble()) {
-    return DefineAsRegister(new(zone()) LClampDToUint8(reg));
-  } else if (input_rep.IsInteger32()) {
-    return DefineAsRegister(new(zone()) LClampIToUint8(reg));
-  } else {
-    DCHECK(input_rep.IsSmiOrTagged());
-    return AssignEnvironment(
-        DefineAsRegister(new(zone()) LClampTToUint8(reg,
-                                                    TempDoubleRegister())));
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
-    HClassOfTestAndBranch* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return new(zone()) LClassOfTestAndBranch(value,
-                                           TempRegister(),
-                                           TempRegister());
-}
-
-
-LInstruction* LChunkBuilder::DoCompareNumericAndBranch(
-    HCompareNumericAndBranch* instr) {
-  Representation r = instr->representation();
-  if (r.IsSmiOrInteger32()) {
-    DCHECK(instr->left()->representation().Equals(r));
-    DCHECK(instr->right()->representation().Equals(r));
-    LOperand* left = UseRegisterOrConstantAtStart(instr->left());
-    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-    return new(zone()) LCompareNumericAndBranch(left, right);
-  } else {
-    DCHECK(r.IsDouble());
-    DCHECK(instr->left()->representation().IsDouble());
-    DCHECK(instr->right()->representation().IsDouble());
-    if (instr->left()->IsConstant() && instr->right()->IsConstant()) {
-      LOperand* left = UseConstant(instr->left());
-      LOperand* right = UseConstant(instr->right());
-      return new(zone()) LCompareNumericAndBranch(left, right);
-    }
-    LOperand* left = UseRegisterAtStart(instr->left());
-    LOperand* right = UseRegisterAtStart(instr->right());
-    return new(zone()) LCompareNumericAndBranch(left, right);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
-  DCHECK(instr->left()->representation().IsTagged());
-  DCHECK(instr->right()->representation().IsTagged());
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* left = UseFixed(instr->left(), x1);
-  LOperand* right = UseFixed(instr->right(), x0);
-  LCmpT* result = new(zone()) LCmpT(context, left, right);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCompareHoleAndBranch(
-    HCompareHoleAndBranch* instr) {
-  LOperand* value = UseRegister(instr->value());
-  if (instr->representation().IsTagged()) {
-    return new(zone()) LCmpHoleAndBranchT(value);
-  } else {
-    LOperand* temp = TempRegister();
-    return new(zone()) LCmpHoleAndBranchD(value, temp);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
-    HCompareObjectEqAndBranch* instr) {
-  LOperand* left = UseRegisterAtStart(instr->left());
-  LOperand* right = UseRegisterAtStart(instr->right());
-  return new(zone()) LCmpObjectEqAndBranch(left, right);
-}
-
-
-LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* temp = TempRegister();
-  return new(zone()) LCmpMapAndBranch(value, temp);
-}
-
-
-LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
-  Representation r = instr->representation();
-  if (r.IsSmi()) {
-    return DefineAsRegister(new(zone()) LConstantS);
-  } else if (r.IsInteger32()) {
-    return DefineAsRegister(new(zone()) LConstantI);
-  } else if (r.IsDouble()) {
-    return DefineAsRegister(new(zone()) LConstantD);
-  } else if (r.IsExternal()) {
-    return DefineAsRegister(new(zone()) LConstantE);
-  } else if (r.IsTagged()) {
-    return DefineAsRegister(new(zone()) LConstantT);
-  } else {
-    UNREACHABLE();
-    return NULL;
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoContext(HContext* instr) {
-  if (instr->HasNoUses()) return NULL;
-
-  if (info()->IsStub()) {
-    return DefineFixed(new(zone()) LContext, cp);
-  }
-
-  return DefineAsRegister(new(zone()) LContext);
-}
-
-
-LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
-  LOperand* object = UseFixed(instr->value(), x0);
-  LDateField* result = new(zone()) LDateField(object, instr->index());
-  return MarkAsCall(DefineFixed(result, x0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* instr) {
-  return new(zone()) LDebugBreak();
-}
-
-
-LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(new(zone()) LDeclareGlobals(context), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
-  return AssignEnvironment(new(zone()) LDeoptimize);
-}
-
-
-LInstruction* LChunkBuilder::DoDivByPowerOf2I(HDiv* instr) {
-  DCHECK(instr->representation().IsInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegister(instr->left());
-  int32_t divisor = instr->right()->GetInteger32Constant();
-  LInstruction* result = DefineAsRegister(new(zone()) LDivByPowerOf2I(
-          dividend, divisor));
-  if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
-      (instr->CheckFlag(HValue::kCanOverflow) && divisor == -1) ||
-      (!instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32) &&
-       divisor != 1 && divisor != -1)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoDivByConstI(HDiv* instr) {
-  DCHECK(instr->representation().IsInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegister(instr->left());
-  int32_t divisor = instr->right()->GetInteger32Constant();
-  LOperand* temp = instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)
-      ? NULL : TempRegister();
-  LInstruction* result = DefineAsRegister(new(zone()) LDivByConstI(
-          dividend, divisor, temp));
-  if (divisor == 0 ||
-      (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
-      !instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoDivI(HBinaryOperation* instr) {
-  DCHECK(instr->representation().IsSmiOrInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegister(instr->left());
-  LOperand* divisor = UseRegister(instr->right());
-  LOperand* temp = instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)
-      ? NULL : TempRegister();
-  LInstruction* result =
-      DefineAsRegister(new(zone()) LDivI(dividend, divisor, temp));
-  if (!instr->CheckFlag(HValue::kAllUsesTruncatingToInt32)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    if (instr->RightIsPowerOf2()) {
-      return DoDivByPowerOf2I(instr);
-    } else if (instr->right()->IsConstant()) {
-      return DoDivByConstI(instr);
-    } else {
-      return DoDivI(instr);
-    }
-  } else if (instr->representation().IsDouble()) {
-    return DoArithmeticD(Token::DIV, instr);
-  } else {
-    return DoArithmeticT(Token::DIV, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoDummyUse(HDummyUse* instr) {
-  return DefineAsRegister(new(zone()) LDummyUse(UseAny(instr->value())));
-}
-
-
-LInstruction* LChunkBuilder::DoEnterInlined(HEnterInlined* instr) {
-  HEnvironment* outer = current_block_->last_environment();
-  outer->set_ast_id(instr->ReturnId());
-  HConstant* undefined = graph()->GetConstantUndefined();
-  HEnvironment* inner = outer->CopyForInlining(instr->closure(),
-                                               instr->arguments_count(),
-                                               instr->function(),
-                                               undefined,
-                                               instr->inlining_kind());
-  // Only replay binding of arguments object if it wasn't removed from graph.
-  if ((instr->arguments_var() != NULL) &&
-      instr->arguments_object()->IsLinked()) {
-    inner->Bind(instr->arguments_var(), instr->arguments_object());
-  }
-  inner->BindContext(instr->closure_context());
-  inner->set_entry(instr);
-  current_block_->UpdateEnvironment(inner);
-  chunk_->AddInlinedFunction(instr->shared());
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
-  UNREACHABLE();
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoForceRepresentation(
-    HForceRepresentation* instr) {
-  // All HForceRepresentation instructions should be eliminated in the
-  // representation change phase of Hydrogen.
-  UNREACHABLE();
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
-    HGetCachedArrayIndex* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LGetCachedArrayIndex(value));
-}
-
-
-LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
-  return new(zone()) LGoto(instr->FirstSuccessor());
-}
-
-
-LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
-    HHasCachedArrayIndexAndBranch* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  return new(zone()) LHasCachedArrayIndexAndBranch(
-      UseRegisterAtStart(instr->value()), TempRegister());
-}
-
-
-LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
-    HHasInstanceTypeAndBranch* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return new(zone()) LHasInstanceTypeAndBranch(value, TempRegister());
-}
-
-
-LInstruction* LChunkBuilder::DoInnerAllocatedObject(
-    HInnerAllocatedObject* instr) {
-  LOperand* base_object = UseRegisterAtStart(instr->base_object());
-  LOperand* offset = UseRegisterOrConstantAtStart(instr->offset());
-  return DefineAsRegister(
-      new(zone()) LInnerAllocatedObject(base_object, offset));
-}
-
-
-LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
-  LOperand* left =
-      UseFixed(instr->left(), InstanceOfDescriptor::LeftRegister());
-  LOperand* right =
-      UseFixed(instr->right(), InstanceOfDescriptor::RightRegister());
-  LOperand* context = UseFixed(instr->context(), cp);
-  LInstanceOf* result = new (zone()) LInstanceOf(context, left, right);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoHasInPrototypeChainAndBranch(
-    HHasInPrototypeChainAndBranch* instr) {
-  LOperand* object = UseRegister(instr->object());
-  LOperand* prototype = UseRegister(instr->prototype());
-  LOperand* scratch = TempRegister();
-  return new (zone()) LHasInPrototypeChainAndBranch(object, prototype, scratch);
-}
-
-
-LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  // The function is required (by MacroAssembler::InvokeFunction) to be in x1.
-  LOperand* function = UseFixed(instr->function(), x1);
-  LInvokeFunction* result = new(zone()) LInvokeFunction(context, function);
-  return MarkAsCall(DefineFixed(result, x0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
-    HIsConstructCallAndBranch* instr) {
-  return new(zone()) LIsConstructCallAndBranch(TempRegister(), TempRegister());
-}
-
-
-LInstruction* LChunkBuilder::DoCompareMinusZeroAndBranch(
-    HCompareMinusZeroAndBranch* instr) {
-  LOperand* value = UseRegister(instr->value());
-  LOperand* scratch = TempRegister();
-  return new(zone()) LCompareMinusZeroAndBranch(value, scratch);
-}
-
-
-LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* temp = TempRegister();
-  return new(zone()) LIsStringAndBranch(value, temp);
-}
-
-
-LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  return new(zone()) LIsSmiAndBranch(UseRegisterAtStart(instr->value()));
-}
-
-
-LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
-    HIsUndetectableAndBranch* instr) {
-  DCHECK(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return new(zone()) LIsUndetectableAndBranch(value, TempRegister());
-}
-
-
-LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
-  LInstruction* pop = NULL;
-  HEnvironment* env = current_block_->last_environment();
-
-  if (env->entry()->arguments_pushed()) {
-    int argument_count = env->arguments_environment()->parameter_count();
-    pop = new(zone()) LDrop(argument_count);
-    DCHECK(instr->argument_delta() == -argument_count);
-  }
-
-  HEnvironment* outer =
-      current_block_->last_environment()->DiscardInlined(false);
-  current_block_->UpdateEnvironment(outer);
-
-  return pop;
-}
-
-
-LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
-  LOperand* context = UseRegisterAtStart(instr->value());
-  LInstruction* result =
-      DefineAsRegister(new(zone()) LLoadContextSlot(context));
-  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
-    HLoadFunctionPrototype* instr) {
-  LOperand* function = UseRegister(instr->function());
-  LOperand* temp = TempRegister();
-  return AssignEnvironment(DefineAsRegister(
-      new(zone()) LLoadFunctionPrototype(function, temp)));
-}
-
-
-LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* global_object =
-      UseFixed(instr->global_object(), LoadDescriptor::ReceiverRegister());
-  LOperand* vector = NULL;
-  if (instr->HasVectorAndSlot()) {
-    vector = FixedTemp(LoadWithVectorDescriptor::VectorRegister());
-  }
-
-  LLoadGlobalGeneric* result =
-      new(zone()) LLoadGlobalGeneric(context, global_object, vector);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadGlobalViaContext(
-    HLoadGlobalViaContext* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  DCHECK(instr->slot_index() > 0);
-  LLoadGlobalViaContext* result = new (zone()) LLoadGlobalViaContext(context);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
-  DCHECK(instr->key()->representation().IsSmiOrInteger32());
-  ElementsKind elements_kind = instr->elements_kind();
-  LOperand* elements = UseRegister(instr->elements());
-  LOperand* key = UseRegisterOrConstant(instr->key());
-
-  if (!instr->is_fixed_typed_array()) {
-    if (instr->representation().IsDouble()) {
-      LOperand* temp = (!instr->key()->IsConstant() ||
-                        instr->RequiresHoleCheck())
-             ? TempRegister()
-             : NULL;
-      LInstruction* result = DefineAsRegister(
-          new (zone()) LLoadKeyedFixedDouble(elements, key, temp));
-      if (instr->RequiresHoleCheck()) {
-        result = AssignEnvironment(result);
-      }
-      return result;
-    } else {
-      DCHECK(instr->representation().IsSmiOrTagged() ||
-             instr->representation().IsInteger32());
-      LOperand* temp = instr->key()->IsConstant() ? NULL : TempRegister();
-      LInstruction* result =
-          DefineAsRegister(new (zone()) LLoadKeyedFixed(elements, key, temp));
-      if (instr->RequiresHoleCheck() ||
-          (instr->hole_mode() == CONVERT_HOLE_TO_UNDEFINED &&
-           info()->IsStub())) {
-        result = AssignEnvironment(result);
-      }
-      return result;
-    }
-  } else {
-    DCHECK((instr->representation().IsInteger32() &&
-            !IsDoubleOrFloatElementsKind(instr->elements_kind())) ||
-           (instr->representation().IsDouble() &&
-            IsDoubleOrFloatElementsKind(instr->elements_kind())));
-
-    LOperand* temp = instr->key()->IsConstant() ? NULL : TempRegister();
-    LInstruction* result = DefineAsRegister(
-        new(zone()) LLoadKeyedExternal(elements, key, temp));
-    if (elements_kind == UINT32_ELEMENTS &&
-        !instr->CheckFlag(HInstruction::kUint32)) {
-      result = AssignEnvironment(result);
-    }
-    return result;
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object =
-      UseFixed(instr->object(), LoadDescriptor::ReceiverRegister());
-  LOperand* key = UseFixed(instr->key(), LoadDescriptor::NameRegister());
-  LOperand* vector = NULL;
-  if (instr->HasVectorAndSlot()) {
-    vector = FixedTemp(LoadWithVectorDescriptor::VectorRegister());
-  }
-
-  LInstruction* result =
-      DefineFixed(new(zone()) LLoadKeyedGeneric(context, object, key, vector),
-                  x0);
-  return MarkAsCall(result, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
-  LOperand* object = UseRegisterAtStart(instr->object());
-  return DefineAsRegister(new(zone()) LLoadNamedField(object));
-}
-
-
-LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object =
-      UseFixed(instr->object(), LoadDescriptor::ReceiverRegister());
-  LOperand* vector = NULL;
-  if (instr->HasVectorAndSlot()) {
-    vector = FixedTemp(LoadWithVectorDescriptor::VectorRegister());
-  }
-
-  LInstruction* result =
-      DefineFixed(new(zone()) LLoadNamedGeneric(context, object, vector), x0);
-  return MarkAsCall(result, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadRoot(HLoadRoot* instr) {
-  return DefineAsRegister(new(zone()) LLoadRoot);
-}
-
-
-LInstruction* LChunkBuilder::DoMapEnumLength(HMapEnumLength* instr) {
-  LOperand* map = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LMapEnumLength(map));
-}
-
-
-LInstruction* LChunkBuilder::DoFlooringDivByPowerOf2I(HMathFloorOfDiv* instr) {
-  DCHECK(instr->representation().IsInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegisterAtStart(instr->left());
-  int32_t divisor = instr->right()->GetInteger32Constant();
-  LInstruction* result = DefineAsRegister(new(zone()) LFlooringDivByPowerOf2I(
-          dividend, divisor));
-  if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
-      (instr->CheckFlag(HValue::kLeftCanBeMinInt) && divisor == -1)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoFlooringDivByConstI(HMathFloorOfDiv* instr) {
-  DCHECK(instr->representation().IsInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegister(instr->left());
-  int32_t divisor = instr->right()->GetInteger32Constant();
-  LOperand* temp =
-      ((divisor > 0 && !instr->CheckFlag(HValue::kLeftCanBeNegative)) ||
-       (divisor < 0 && !instr->CheckFlag(HValue::kLeftCanBePositive))) ?
-      NULL : TempRegister();
-  LInstruction* result = DefineAsRegister(
-      new(zone()) LFlooringDivByConstI(dividend, divisor, temp));
-  if (divisor == 0 ||
-      (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoFlooringDivI(HMathFloorOfDiv* instr) {
-  LOperand* dividend = UseRegister(instr->left());
-  LOperand* divisor = UseRegister(instr->right());
-  LOperand* remainder = TempRegister();
-  LInstruction* result =
-      DefineAsRegister(new(zone()) LFlooringDivI(dividend, divisor, remainder));
-  return AssignEnvironment(result);
-}
-
-
-LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
-  if (instr->RightIsPowerOf2()) {
-    return DoFlooringDivByPowerOf2I(instr);
-  } else if (instr->right()->IsConstant()) {
-    return DoFlooringDivByConstI(instr);
-  } else {
-    return DoFlooringDivI(instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoMathMinMax(HMathMinMax* instr) {
-  LOperand* left = NULL;
-  LOperand* right = NULL;
-  if (instr->representation().IsSmiOrInteger32()) {
-    DCHECK(instr->left()->representation().Equals(instr->representation()));
-    DCHECK(instr->right()->representation().Equals(instr->representation()));
-    left = UseRegisterAtStart(instr->BetterLeftOperand());
-    right = UseRegisterOrConstantAtStart(instr->BetterRightOperand());
-  } else {
-    DCHECK(instr->representation().IsDouble());
-    DCHECK(instr->left()->representation().IsDouble());
-    DCHECK(instr->right()->representation().IsDouble());
-    left = UseRegisterAtStart(instr->left());
-    right = UseRegisterAtStart(instr->right());
-  }
-  return DefineAsRegister(new(zone()) LMathMinMax(left, right));
-}
-
-
-LInstruction* LChunkBuilder::DoModByPowerOf2I(HMod* instr) {
-  DCHECK(instr->representation().IsInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegisterAtStart(instr->left());
-  int32_t divisor = instr->right()->GetInteger32Constant();
-  LInstruction* result = DefineSameAsFirst(new(zone()) LModByPowerOf2I(
-          dividend, divisor));
-  if (instr->CheckFlag(HValue::kLeftCanBeNegative) &&
-      instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoModByConstI(HMod* instr) {
-  DCHECK(instr->representation().IsInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegister(instr->left());
-  int32_t divisor = instr->right()->GetInteger32Constant();
-  LOperand* temp = TempRegister();
-  LInstruction* result = DefineAsRegister(new(zone()) LModByConstI(
-          dividend, divisor, temp));
-  if (divisor == 0 || instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoModI(HMod* instr) {
-  DCHECK(instr->representation().IsSmiOrInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegister(instr->left());
-  LOperand* divisor = UseRegister(instr->right());
-  LInstruction* result = DefineAsRegister(new(zone()) LModI(dividend, divisor));
-  if (instr->CheckFlag(HValue::kCanBeDivByZero) ||
-      instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoMod(HMod* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    if (instr->RightIsPowerOf2()) {
-      return DoModByPowerOf2I(instr);
-    } else if (instr->right()->IsConstant()) {
-      return DoModByConstI(instr);
-    } else {
-      return DoModI(instr);
-    }
-  } else if (instr->representation().IsDouble()) {
-    return DoArithmeticD(Token::MOD, instr);
-  } else {
-    return DoArithmeticT(Token::MOD, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoMul(HMul* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    DCHECK(instr->left()->representation().Equals(instr->representation()));
-    DCHECK(instr->right()->representation().Equals(instr->representation()));
-
-    bool can_overflow = instr->CheckFlag(HValue::kCanOverflow);
-    bool bailout_on_minus_zero = instr->CheckFlag(HValue::kBailoutOnMinusZero);
-
-    HValue* least_const = instr->BetterLeftOperand();
-    HValue* most_const = instr->BetterRightOperand();
-
-    // LMulConstI can handle a subset of constants:
-    //  With support for overflow detection:
-    //    -1, 0, 1, 2
-    //    2^n, -(2^n)
-    //  Without support for overflow detection:
-    //    2^n + 1, -(2^n - 1)
-    if (most_const->IsConstant()) {
-      int32_t constant = HConstant::cast(most_const)->Integer32Value();
-      bool small_constant = (constant >= -1) && (constant <= 2);
-      bool end_range_constant = (constant <= -kMaxInt) || (constant == kMaxInt);
-      int32_t constant_abs = Abs(constant);
-
-      if (!end_range_constant &&
-          (small_constant || (base::bits::IsPowerOfTwo32(constant_abs)) ||
-           (!can_overflow && (base::bits::IsPowerOfTwo32(constant_abs + 1) ||
-                              base::bits::IsPowerOfTwo32(constant_abs - 1))))) {
-        LConstantOperand* right = UseConstant(most_const);
-        bool need_register =
-            base::bits::IsPowerOfTwo32(constant_abs) && !small_constant;
-        LOperand* left = need_register ? UseRegister(least_const)
-                                       : UseRegisterAtStart(least_const);
-        LInstruction* result =
-            DefineAsRegister(new(zone()) LMulConstIS(left, right));
-        if ((bailout_on_minus_zero && constant <= 0) ||
-            (can_overflow && constant != 1 &&
-             base::bits::IsPowerOfTwo32(constant_abs))) {
-          result = AssignEnvironment(result);
-        }
-        return result;
-      }
-    }
-
-    // LMulI/S can handle all cases, but it requires that a register is
-    // allocated for the second operand.
-    LOperand* left = UseRegisterAtStart(least_const);
-    LOperand* right = UseRegisterAtStart(most_const);
-    LInstruction* result = instr->representation().IsSmi()
-        ? DefineAsRegister(new(zone()) LMulS(left, right))
-        : DefineAsRegister(new(zone()) LMulI(left, right));
-    if ((bailout_on_minus_zero && least_const != most_const) || can_overflow) {
-      result = AssignEnvironment(result);
-    }
-    return result;
-  } else if (instr->representation().IsDouble()) {
-    return DoArithmeticD(Token::MUL, instr);
-  } else {
-    return DoArithmeticT(Token::MUL, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
-  DCHECK(argument_count_ == 0);
-  allocator_->MarkAsOsrEntry();
-  current_block_->last_environment()->set_ast_id(instr->ast_id());
-  return AssignEnvironment(new(zone()) LOsrEntry);
-}
-
-
-LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
-  LParameter* result = new(zone()) LParameter;
-  if (instr->kind() == HParameter::STACK_PARAMETER) {
-    int spill_index = chunk_->GetParameterStackSlot(instr->index());
-    return DefineAsSpilled(result, spill_index);
-  } else {
-    DCHECK(info()->IsStub());
-    CallInterfaceDescriptor descriptor =
-        info()->code_stub()->GetCallInterfaceDescriptor();
-    int index = static_cast<int>(instr->index());
-    Register reg = descriptor.GetRegisterParameter(index);
-    return DefineFixed(result, reg);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoPower(HPower* instr) {
-  DCHECK(instr->representation().IsDouble());
-  // We call a C function for double power. It can't trigger a GC.
-  // We need to use fixed result register for the call.
-  Representation exponent_type = instr->right()->representation();
-  DCHECK(instr->left()->representation().IsDouble());
-  LOperand* left = UseFixedDouble(instr->left(), d0);
-  LOperand* right;
-  if (exponent_type.IsInteger32()) {
-    right = UseFixed(instr->right(), MathPowIntegerDescriptor::exponent());
-  } else if (exponent_type.IsDouble()) {
-    right = UseFixedDouble(instr->right(), d1);
-  } else {
-    right = UseFixed(instr->right(), MathPowTaggedDescriptor::exponent());
-  }
-  LPower* result = new(zone()) LPower(left, right);
-  return MarkAsCall(DefineFixedDouble(result, d0),
-                    instr,
-                    CAN_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoPushArguments(HPushArguments* instr) {
-  int argc = instr->OperandCount();
-  AddInstruction(new(zone()) LPreparePushArguments(argc), instr);
-
-  LPushArguments* push_args = new(zone()) LPushArguments(zone());
-
-  for (int i = 0; i < argc; ++i) {
-    if (push_args->ShouldSplitPush()) {
-      AddInstruction(push_args, instr);
-      push_args = new(zone()) LPushArguments(zone());
-    }
-    push_args->AddArgument(UseRegister(instr->argument(i)));
-  }
-
-  return push_args;
-}
-
-
-LInstruction* LChunkBuilder::DoRegExpLiteral(HRegExpLiteral* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(
-      DefineFixed(new(zone()) LRegExpLiteral(context), x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoDoubleBits(HDoubleBits* instr) {
-  HValue* value = instr->value();
-  DCHECK(value->representation().IsDouble());
-  return DefineAsRegister(new(zone()) LDoubleBits(UseRegister(value)));
-}
-
-
-LInstruction* LChunkBuilder::DoConstructDouble(HConstructDouble* instr) {
-  LOperand* lo = UseRegisterAndClobber(instr->lo());
-  LOperand* hi = UseRegister(instr->hi());
-  return DefineAsRegister(new(zone()) LConstructDouble(hi, lo));
-}
-
-
-LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
-  LOperand* context = info()->IsStub()
-      ? UseFixed(instr->context(), cp)
-      : NULL;
-  LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
-  return new(zone()) LReturn(UseFixed(instr->value(), x0), context,
-                             parameter_count);
-}
-
-
-LInstruction* LChunkBuilder::DoSeqStringGetChar(HSeqStringGetChar* instr) {
-  LOperand* string = UseRegisterAtStart(instr->string());
-  LOperand* index = UseRegisterOrConstantAtStart(instr->index());
-  LOperand* temp = TempRegister();
-  LSeqStringGetChar* result =
-      new(zone()) LSeqStringGetChar(string, index, temp);
-  return DefineAsRegister(result);
-}
-
-
-LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
-  LOperand* string = UseRegister(instr->string());
-  LOperand* index = FLAG_debug_code
-      ? UseRegister(instr->index())
-      : UseRegisterOrConstant(instr->index());
-  LOperand* value = UseRegister(instr->value());
-  LOperand* context = FLAG_debug_code ? UseFixed(instr->context(), cp) : NULL;
-  LOperand* temp = TempRegister();
-  LSeqStringSetChar* result =
-      new(zone()) LSeqStringSetChar(context, string, index, value, temp);
-  return DefineAsRegister(result);
-}
-
-
-HBitwiseBinaryOperation* LChunkBuilder::CanTransformToShiftedOp(HValue* val,
-                                                                HValue** left) {
-  if (!val->representation().IsInteger32()) return NULL;
-  if (!(val->IsBitwise() || val->IsAdd() || val->IsSub())) return NULL;
-
-  HBinaryOperation* hinstr = HBinaryOperation::cast(val);
-  HValue* hleft = hinstr->left();
-  HValue* hright = hinstr->right();
-  DCHECK(hleft->representation().Equals(hinstr->representation()));
-  DCHECK(hright->representation().Equals(hinstr->representation()));
-
-  if (hleft == hright) return NULL;
-
-  if ((hright->IsConstant() &&
-       LikelyFitsImmField(hinstr, HConstant::cast(hright)->Integer32Value())) ||
-      (hinstr->IsCommutative() && hleft->IsConstant() &&
-       LikelyFitsImmField(hinstr, HConstant::cast(hleft)->Integer32Value()))) {
-    // The constant operand will likely fit in the immediate field. We are
-    // better off with
-    //     lsl x8, x9, #imm
-    //     add x0, x8, #imm2
-    // than with
-    //     mov x16, #imm2
-    //     add x0, x16, x9 LSL #imm
-    return NULL;
-  }
-
-  HBitwiseBinaryOperation* shift = NULL;
-  // TODO(aleram): We will miss situations where a shift operation is used by
-  // different instructions both as a left and right operands.
-  if (hright->IsBitwiseBinaryShift() &&
-      HBitwiseBinaryOperation::cast(hright)->right()->IsConstant()) {
-    shift = HBitwiseBinaryOperation::cast(hright);
-    if (left != NULL) {
-      *left = hleft;
-    }
-  } else if (hinstr->IsCommutative() &&
-             hleft->IsBitwiseBinaryShift() &&
-             HBitwiseBinaryOperation::cast(hleft)->right()->IsConstant()) {
-    shift = HBitwiseBinaryOperation::cast(hleft);
-    if (left != NULL) {
-      *left = hright;
-    }
-  } else {
-    return NULL;
-  }
-
-  if ((JSShiftAmountFromHConstant(shift->right()) == 0) && shift->IsShr()) {
-    // Shifts right by zero can deoptimize.
-    return NULL;
-  }
-
-  return shift;
-}
-
-
-bool LChunkBuilder::ShiftCanBeOptimizedAway(HBitwiseBinaryOperation* shift) {
-  if (!shift->representation().IsInteger32()) {
-    return false;
-  }
-  for (HUseIterator it(shift->uses()); !it.Done(); it.Advance()) {
-    if (shift != CanTransformToShiftedOp(it.value())) {
-      return false;
-    }
-  }
-  return true;
-}
-
-
-LInstruction* LChunkBuilder::TryDoOpWithShiftedRightOperand(
-    HBinaryOperation* instr) {
-  HValue* left;
-  HBitwiseBinaryOperation* shift = CanTransformToShiftedOp(instr, &left);
-
-  if ((shift != NULL) && ShiftCanBeOptimizedAway(shift)) {
-    return DoShiftedBinaryOp(instr, left, shift);
-  }
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoShiftedBinaryOp(
-    HBinaryOperation* hinstr, HValue* hleft, HBitwiseBinaryOperation* hshift) {
-  DCHECK(hshift->IsBitwiseBinaryShift());
-  DCHECK(!hshift->IsShr() || (JSShiftAmountFromHConstant(hshift->right()) > 0));
-
-  LTemplateResultInstruction<1>* res;
-  LOperand* left = UseRegisterAtStart(hleft);
-  LOperand* right = UseRegisterAtStart(hshift->left());
-  LOperand* shift_amount = UseConstant(hshift->right());
-  Shift shift_op;
-  switch (hshift->opcode()) {
-    case HValue::kShl: shift_op = LSL; break;
-    case HValue::kShr: shift_op = LSR; break;
-    case HValue::kSar: shift_op = ASR; break;
-    default: UNREACHABLE(); shift_op = NO_SHIFT;
-  }
-
-  if (hinstr->IsBitwise()) {
-    res = new(zone()) LBitI(left, right, shift_op, shift_amount);
-  } else if (hinstr->IsAdd()) {
-    res = new(zone()) LAddI(left, right, shift_op, shift_amount);
-  } else {
-    DCHECK(hinstr->IsSub());
-    res = new(zone()) LSubI(left, right, shift_op, shift_amount);
-  }
-  if (hinstr->CheckFlag(HValue::kCanOverflow)) {
-    AssignEnvironment(res);
-  }
-  return DefineAsRegister(res);
-}
-
-
-LInstruction* LChunkBuilder::DoShift(Token::Value op,
-                                     HBitwiseBinaryOperation* instr) {
-  if (instr->representation().IsTagged()) {
-    return DoArithmeticT(op, instr);
-  }
-
-  DCHECK(instr->representation().IsSmiOrInteger32());
-  DCHECK(instr->left()->representation().Equals(instr->representation()));
-  DCHECK(instr->right()->representation().Equals(instr->representation()));
-
-  if (ShiftCanBeOptimizedAway(instr)) {
-    return NULL;
-  }
-
-  LOperand* left = instr->representation().IsSmi()
-      ? UseRegister(instr->left())
-      : UseRegisterAtStart(instr->left());
-  LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-
-  // The only shift that can deoptimize is `left >>> 0`, where left is negative.
-  // In these cases, the result is a uint32 that is too large for an int32.
-  bool right_can_be_zero = !instr->right()->IsConstant() ||
-                           (JSShiftAmountFromHConstant(instr->right()) == 0);
-  bool can_deopt = false;
-  if ((op == Token::SHR) && right_can_be_zero) {
-    can_deopt = !instr->CheckFlag(HInstruction::kUint32);
-  }
-
-  LInstruction* result;
-  if (instr->representation().IsInteger32()) {
-    result = DefineAsRegister(new (zone()) LShiftI(op, left, right, can_deopt));
-  } else {
-    DCHECK(instr->representation().IsSmi());
-    result = DefineAsRegister(new (zone()) LShiftS(op, left, right, can_deopt));
-  }
-
-  return can_deopt ? AssignEnvironment(result) : result;
-}
-
-
-LInstruction* LChunkBuilder::DoRor(HRor* instr) {
-  return DoShift(Token::ROR, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoSar(HSar* instr) {
-  return DoShift(Token::SAR, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoShl(HShl* instr) {
-  return DoShift(Token::SHL, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoShr(HShr* instr) {
-  return DoShift(Token::SHR, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
-  instr->ReplayEnvironment(current_block_->last_environment());
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
-  if (instr->is_function_entry()) {
-    LOperand* context = UseFixed(instr->context(), cp);
-    return MarkAsCall(new(zone()) LStackCheck(context), instr);
-  } else {
-    DCHECK(instr->is_backwards_branch());
-    LOperand* context = UseAny(instr->context());
-    return AssignEnvironment(
-        AssignPointerMap(new(zone()) LStackCheck(context)));
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoStoreCodeEntry(HStoreCodeEntry* instr) {
-  LOperand* function = UseRegister(instr->function());
-  LOperand* code_object = UseRegisterAtStart(instr->code_object());
-  LOperand* temp = TempRegister();
-  return new(zone()) LStoreCodeEntry(function, code_object, temp);
-}
-
-
-LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
-  LOperand* temp = TempRegister();
-  LOperand* context;
-  LOperand* value;
-  if (instr->NeedsWriteBarrier()) {
-    // TODO(all): Replace these constraints when RecordWriteStub has been
-    // rewritten.
-    context = UseRegisterAndClobber(instr->context());
-    value = UseRegisterAndClobber(instr->value());
-  } else {
-    context = UseRegister(instr->context());
-    value = UseRegister(instr->value());
-  }
-  LInstruction* result = new(zone()) LStoreContextSlot(context, value, temp);
-  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
-  LOperand* key = UseRegisterOrConstant(instr->key());
-  LOperand* temp = NULL;
-  LOperand* elements = NULL;
-  LOperand* val = NULL;
-
-  if (!instr->is_fixed_typed_array() &&
-      instr->value()->representation().IsTagged() &&
-      instr->NeedsWriteBarrier()) {
-    // RecordWrite() will clobber all registers.
-    elements = UseRegisterAndClobber(instr->elements());
-    val = UseRegisterAndClobber(instr->value());
-    temp = TempRegister();
-  } else {
-    elements = UseRegister(instr->elements());
-    val = UseRegister(instr->value());
-    temp = instr->key()->IsConstant() ? NULL : TempRegister();
-  }
-
-  if (instr->is_fixed_typed_array()) {
-    DCHECK((instr->value()->representation().IsInteger32() &&
-            !IsDoubleOrFloatElementsKind(instr->elements_kind())) ||
-           (instr->value()->representation().IsDouble() &&
-            IsDoubleOrFloatElementsKind(instr->elements_kind())));
-    DCHECK(instr->elements()->representation().IsExternal());
-    return new(zone()) LStoreKeyedExternal(elements, key, val, temp);
-
-  } else if (instr->value()->representation().IsDouble()) {
-    DCHECK(instr->elements()->representation().IsTagged());
-    return new(zone()) LStoreKeyedFixedDouble(elements, key, val, temp);
-
-  } else {
-    DCHECK(instr->elements()->representation().IsTagged());
-    DCHECK(instr->value()->representation().IsSmiOrTagged() ||
-           instr->value()->representation().IsInteger32());
-    return new(zone()) LStoreKeyedFixed(elements, key, val, temp);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoStoreKeyedGeneric(HStoreKeyedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object =
-      UseFixed(instr->object(), StoreDescriptor::ReceiverRegister());
-  LOperand* key = UseFixed(instr->key(), StoreDescriptor::NameRegister());
-  LOperand* value = UseFixed(instr->value(), StoreDescriptor::ValueRegister());
-
-  DCHECK(instr->object()->representation().IsTagged());
-  DCHECK(instr->key()->representation().IsTagged());
-  DCHECK(instr->value()->representation().IsTagged());
-
-  LOperand* slot = NULL;
-  LOperand* vector = NULL;
-  if (instr->HasVectorAndSlot()) {
-    slot = FixedTemp(VectorStoreICDescriptor::SlotRegister());
-    vector = FixedTemp(VectorStoreICDescriptor::VectorRegister());
-  }
-
-  LStoreKeyedGeneric* result = new (zone())
-      LStoreKeyedGeneric(context, object, key, value, slot, vector);
-  return MarkAsCall(result, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
-  // TODO(jbramley): It might be beneficial to allow value to be a constant in
-  // some cases. x64 makes use of this with FLAG_track_fields, for example.
-
-  LOperand* object = UseRegister(instr->object());
-  LOperand* value;
-  LOperand* temp0 = NULL;
-  LOperand* temp1 = NULL;
-
-  if (instr->access().IsExternalMemory() ||
-      (!FLAG_unbox_double_fields && instr->field_representation().IsDouble())) {
-    value = UseRegister(instr->value());
-  } else if (instr->NeedsWriteBarrier()) {
-    value = UseRegisterAndClobber(instr->value());
-    temp0 = TempRegister();
-    temp1 = TempRegister();
-  } else if (instr->NeedsWriteBarrierForMap()) {
-    value = UseRegister(instr->value());
-    temp0 = TempRegister();
-    temp1 = TempRegister();
-  } else {
-    value = UseRegister(instr->value());
-    temp0 = TempRegister();
-  }
-
-  return new(zone()) LStoreNamedField(object, value, temp0, temp1);
-}
-
-
-LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object =
-      UseFixed(instr->object(), StoreDescriptor::ReceiverRegister());
-  LOperand* value = UseFixed(instr->value(), StoreDescriptor::ValueRegister());
-
-  LOperand* slot = NULL;
-  LOperand* vector = NULL;
-  if (instr->HasVectorAndSlot()) {
-    slot = FixedTemp(VectorStoreICDescriptor::SlotRegister());
-    vector = FixedTemp(VectorStoreICDescriptor::VectorRegister());
-  }
-
-  LStoreNamedGeneric* result =
-      new (zone()) LStoreNamedGeneric(context, object, value, slot, vector);
-  return MarkAsCall(result, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoStoreGlobalViaContext(
-    HStoreGlobalViaContext* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* value = UseFixed(instr->value(),
-                             StoreGlobalViaContextDescriptor::ValueRegister());
-  DCHECK(instr->slot_index() > 0);
-
-  LStoreGlobalViaContext* result =
-      new (zone()) LStoreGlobalViaContext(context, value);
-  return MarkAsCall(result, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoStringAdd(HStringAdd* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* left = UseFixed(instr->left(), x1);
-  LOperand* right = UseFixed(instr->right(), x0);
-
-  LStringAdd* result = new(zone()) LStringAdd(context, left, right);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoStringCharCodeAt(HStringCharCodeAt* instr) {
-  LOperand* string = UseRegisterAndClobber(instr->string());
-  LOperand* index = UseRegisterAndClobber(instr->index());
-  LOperand* context = UseAny(instr->context());
-  LStringCharCodeAt* result =
-      new(zone()) LStringCharCodeAt(context, string, index);
-  return AssignPointerMap(DefineAsRegister(result));
-}
-
-
-LInstruction* LChunkBuilder::DoStringCharFromCode(HStringCharFromCode* instr) {
-  LOperand* char_code = UseRegister(instr->value());
-  LOperand* context = UseAny(instr->context());
-  LStringCharFromCode* result =
-      new(zone()) LStringCharFromCode(context, char_code);
-  return AssignPointerMap(DefineAsRegister(result));
-}
-
-
-LInstruction* LChunkBuilder::DoStringCompareAndBranch(
-    HStringCompareAndBranch* instr) {
-  DCHECK(instr->left()->representation().IsTagged());
-  DCHECK(instr->right()->representation().IsTagged());
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* left = UseFixed(instr->left(), x1);
-  LOperand* right = UseFixed(instr->right(), x0);
-  LStringCompareAndBranch* result =
-      new(zone()) LStringCompareAndBranch(context, left, right);
-  return MarkAsCall(result, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoSub(HSub* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    DCHECK(instr->left()->representation().Equals(instr->representation()));
-    DCHECK(instr->right()->representation().Equals(instr->representation()));
-
-    LInstruction* shifted_operation = TryDoOpWithShiftedRightOperand(instr);
-    if (shifted_operation != NULL) {
-      return shifted_operation;
-    }
-
-    LOperand *left;
-    if (instr->left()->IsConstant() &&
-        (HConstant::cast(instr->left())->Integer32Value() == 0)) {
-      left = UseConstant(instr->left());
-    } else {
-      left = UseRegisterAtStart(instr->left());
-    }
-    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-    LInstruction* result = instr->representation().IsSmi() ?
-        DefineAsRegister(new(zone()) LSubS(left, right)) :
-        DefineAsRegister(new(zone()) LSubI(left, right));
-    if (instr->CheckFlag(HValue::kCanOverflow)) {
-      result = AssignEnvironment(result);
-    }
-    return result;
-  } else if (instr->representation().IsDouble()) {
-    return DoArithmeticD(Token::SUB, instr);
-  } else {
-    return DoArithmeticT(Token::SUB, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
-  if (instr->HasNoUses()) {
-    return NULL;
-  } else {
-    return DefineAsRegister(new(zone()) LThisFunction);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
-  LOperand* object = UseFixed(instr->value(), x0);
-  LToFastProperties* result = new(zone()) LToFastProperties(object);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoTransitionElementsKind(
-    HTransitionElementsKind* instr) {
-  if (IsSimpleMapChangeTransition(instr->from_kind(), instr->to_kind())) {
-    LOperand* object = UseRegister(instr->object());
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, NULL,
-                                            TempRegister(), TempRegister());
-    return result;
-  } else {
-    LOperand* object = UseFixed(instr->object(), x0);
-    LOperand* context = UseFixed(instr->context(), cp);
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, context, NULL, NULL);
-    return MarkAsCall(result, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoTrapAllocationMemento(
-    HTrapAllocationMemento* instr) {
-  LOperand* object = UseRegister(instr->object());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LTrapAllocationMemento* result =
-      new(zone()) LTrapAllocationMemento(object, temp1, temp2);
-  return AssignEnvironment(result);
-}
-
-
-LInstruction* LChunkBuilder::DoMaybeGrowElements(HMaybeGrowElements* instr) {
-  info()->MarkAsDeferredCalling();
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseRegister(instr->object());
-  LOperand* elements = UseRegister(instr->elements());
-  LOperand* key = UseRegisterOrConstant(instr->key());
-  LOperand* current_capacity = UseRegisterOrConstant(instr->current_capacity());
-
-  LMaybeGrowElements* result = new (zone())
-      LMaybeGrowElements(context, object, elements, key, current_capacity);
-  DefineFixed(result, x0);
-  return AssignPointerMap(AssignEnvironment(result));
-}
-
-
-LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* value = UseFixed(instr->value(), x3);
-  LTypeof* result = new (zone()) LTypeof(context, value);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoTypeofIsAndBranch(HTypeofIsAndBranch* instr) {
-  // We only need temp registers in some cases, but we can't dereference the
-  // instr->type_literal() handle to test that here.
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-
-  return new(zone()) LTypeofIsAndBranch(
-      UseRegister(instr->value()), temp1, temp2);
-}
-
-
-LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
-  switch (instr->op()) {
-    case kMathAbs: {
-      Representation r = instr->representation();
-      if (r.IsTagged()) {
-        // The tagged case might need to allocate a HeapNumber for the result,
-        // so it is handled by a separate LInstruction.
-        LOperand* context = UseFixed(instr->context(), cp);
-        LOperand* input = UseRegister(instr->value());
-        LOperand* temp1 = TempRegister();
-        LOperand* temp2 = TempRegister();
-        LOperand* temp3 = TempRegister();
-        LInstruction* result = DefineAsRegister(
-            new(zone()) LMathAbsTagged(context, input, temp1, temp2, temp3));
-        return AssignEnvironment(AssignPointerMap(result));
-      } else {
-        LOperand* input = UseRegisterAtStart(instr->value());
-        LInstruction* result = DefineAsRegister(new(zone()) LMathAbs(input));
-        if (!r.IsDouble()) result = AssignEnvironment(result);
-        return result;
-      }
-    }
-    case kMathExp: {
-      DCHECK(instr->representation().IsDouble());
-      DCHECK(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegister(instr->value());
-      LOperand* double_temp1 = TempDoubleRegister();
-      LOperand* temp1 = TempRegister();
-      LOperand* temp2 = TempRegister();
-      LOperand* temp3 = TempRegister();
-      LMathExp* result = new(zone()) LMathExp(input, double_temp1,
-                                              temp1, temp2, temp3);
-      return DefineAsRegister(result);
-    }
-    case kMathFloor: {
-      DCHECK(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegisterAtStart(instr->value());
-      if (instr->representation().IsInteger32()) {
-        LMathFloorI* result = new(zone()) LMathFloorI(input);
-        return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-      } else {
-        DCHECK(instr->representation().IsDouble());
-        LMathFloorD* result = new(zone()) LMathFloorD(input);
-        return DefineAsRegister(result);
-      }
-    }
-    case kMathLog: {
-      DCHECK(instr->representation().IsDouble());
-      DCHECK(instr->value()->representation().IsDouble());
-      LOperand* input = UseFixedDouble(instr->value(), d0);
-      LMathLog* result = new(zone()) LMathLog(input);
-      return MarkAsCall(DefineFixedDouble(result, d0), instr);
-    }
-    case kMathPowHalf: {
-      DCHECK(instr->representation().IsDouble());
-      DCHECK(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegister(instr->value());
-      return DefineAsRegister(new(zone()) LMathPowHalf(input));
-    }
-    case kMathRound: {
-      DCHECK(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegister(instr->value());
-      if (instr->representation().IsInteger32()) {
-        LOperand* temp = TempDoubleRegister();
-        LMathRoundI* result = new(zone()) LMathRoundI(input, temp);
-        return AssignEnvironment(DefineAsRegister(result));
-      } else {
-        DCHECK(instr->representation().IsDouble());
-        LMathRoundD* result = new(zone()) LMathRoundD(input);
-        return DefineAsRegister(result);
-      }
-    }
-    case kMathFround: {
-      DCHECK(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegister(instr->value());
-      LMathFround* result = new (zone()) LMathFround(input);
-      return DefineAsRegister(result);
-    }
-    case kMathSqrt: {
-      DCHECK(instr->representation().IsDouble());
-      DCHECK(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegisterAtStart(instr->value());
-      return DefineAsRegister(new(zone()) LMathSqrt(input));
-    }
-    case kMathClz32: {
-      DCHECK(instr->representation().IsInteger32());
-      DCHECK(instr->value()->representation().IsInteger32());
-      LOperand* input = UseRegisterAtStart(instr->value());
-      return DefineAsRegister(new(zone()) LMathClz32(input));
-    }
-    default:
-      UNREACHABLE();
-      return NULL;
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
-  // Use an index that corresponds to the location in the unoptimized frame,
-  // which the optimized frame will subsume.
-  int env_index = instr->index();
-  int spill_index = 0;
-  if (instr->environment()->is_parameter_index(env_index)) {
-    spill_index = chunk_->GetParameterStackSlot(env_index);
-  } else {
-    spill_index = env_index - instr->environment()->first_local_index();
-    if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
-      Retry(kTooManySpillSlotsNeededForOSR);
-      spill_index = 0;
-    }
-  }
-  return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
-}
-
-
-LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  // Assign object to a fixed register different from those already used in
-  // LForInPrepareMap.
-  LOperand* object = UseFixed(instr->enumerable(), x0);
-  LForInPrepareMap* result = new(zone()) LForInPrepareMap(context, object);
-  return MarkAsCall(DefineFixed(result, x0), instr, CAN_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
-  LOperand* map = UseRegister(instr->map());
-  return AssignEnvironment(DefineAsRegister(new(zone()) LForInCacheArray(map)));
-}
-
-
-LInstruction* LChunkBuilder::DoCheckMapValue(HCheckMapValue* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* map = UseRegister(instr->map());
-  LOperand* temp = TempRegister();
-  return AssignEnvironment(new(zone()) LCheckMapValue(value, map, temp));
-}
-
-
-LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
-  LOperand* object = UseRegisterAtStart(instr->object());
-  LOperand* index = UseRegisterAndClobber(instr->index());
-  LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index);
-  LInstruction* result = DefineSameAsFirst(load);
-  return AssignPointerMap(result);
-}
-
-
-LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
-  LOperand* receiver = UseRegister(instr->receiver());
-  LOperand* function = UseRegister(instr->function());
-  LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
-  return AssignEnvironment(DefineAsRegister(result));
-}
-
-
-LInstruction* LChunkBuilder::DoStoreFrameContext(HStoreFrameContext* instr) {
-  LOperand* context = UseRegisterAtStart(instr->context());
-  return new(zone()) LStoreFrameContext(context);
-}
-
-
-LInstruction* LChunkBuilder::DoAllocateBlockContext(
-    HAllocateBlockContext* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* function = UseRegisterAtStart(instr->function());
-  LAllocateBlockContext* result =
-      new(zone()) LAllocateBlockContext(context, function);
-  return MarkAsCall(DefineFixed(result, cp), instr);
-}
-
-
-}  // namespace internal
-}  // namespace v8