Rename A64 port to ARM64 port

src/a64/lithium-a64.cc

-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "lithium-allocator-inl.h"
-#include "a64/lithium-a64.h"
-#include "a64/lithium-codegen-a64.h"
-#include "hydrogen-osr.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.
-  ASSERT(Output() == NULL ||
-         LUnallocated::cast(Output())->HasFixedPolicy() ||
-         !LUnallocated::cast(Output())->HasRegisterPolicy());
-  for (UseIterator it(this); !it.Done(); it.Advance()) {
-    LUnallocated* operand = LUnallocated::cast(it.Current());
-    ASSERT(operand->HasFixedPolicy() ||
-           operand->IsUsedAtStart());
-  }
-  for (TempIterator it(this); !it.Done(); it.Advance()) {
-    LUnallocated* operand = LUnallocated::cast(it.Current());
-    ASSERT(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 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 LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if is_object(");
-  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 LStoreNamedField::PrintDataTo(StringStream* stream) {
-  object()->PrintTo(stream);
-  hydrogen()->access().PrintTo(stream);
-  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 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;
-  }
-}
-
-
-void LChunkBuilder::Abort(BailoutReason reason) {
-  info()->set_bailout_reason(reason);
-  status_ = ABORTED;
-}
-
-
-LUnallocated* LChunkBuilder::ToUnallocated(Register reg) {
-  return new(zone()) LUnallocated(LUnallocated::FIXED_REGISTER,
-                                  Register::ToAllocationIndex(reg));
-}
-
-
-LUnallocated* LChunkBuilder::ToUnallocated(DoubleRegister reg) {
-  return new(zone()) LUnallocated(LUnallocated::FIXED_DOUBLE_REGISTER,
-                                  DoubleRegister::ToAllocationIndex(reg));
-}
-
-
-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);
-  }
-
-  return instr;
-}
-
-
-LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
-  ASSERT(!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;
-}
-
-
-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 {
-    ASSERT(kind == GENERAL_REGISTERS);
-    return LStackSlot::Create(index, zone());
-  }
-}
-
-
-LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
-  LUnallocated* operand = ToUnallocated(reg);
-  ASSERT(operand->HasFixedPolicy());
-  return operand;
-}
-
-
-LPlatformChunk* LChunkBuilder::Build() {
-  ASSERT(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) {
-  ASSERT(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.
-    ASSERT(block->phis()->length() == 0);
-    HBasicBlock* pred = block->predecessors()->at(0);
-    HEnvironment* last_environment = pred->last_environment();
-    ASSERT(last_environment != NULL);
-
-    // Only copy the environment, if it is later used again.
-    if (pred->end()->SecondSuccessor() == NULL) {
-      ASSERT(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);
-    ASSERT(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 {
-      ASSERT(!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 {
-    instr = current->CompileToLithium(this);
-  }
-
-  argument_count_ += current->argument_delta();
-  ASSERT(argument_count_ >= 0);
-
-  if (instr != NULL) {
-    // Associate the hydrogen instruction first, since we may need it for
-    // the ClobbersRegisters() or ClobbersDoubleRegisters() calls below.
-    instr->set_hydrogen_value(current);
-
-#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())) {
-      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;
-      }
-      ASSERT(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()) {
-      HValue* hydrogen_value_for_lazy_bailout = current;
-      LInstruction* instruction_needing_environment = NULL;
-      if (current->HasObservableSideEffects()) {
-        HSimulate* sim = HSimulate::cast(current->next());
-        instruction_needing_environment = instr;
-        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_);
-      if (instruction_needing_environment != NULL) {
-        // Store the lazy deopt environment with the instruction if needed.
-        // Right now it is only used for LInstanceOfKnownGlobal.
-        instruction_needing_environment->
-            SetDeferredLazyDeoptimizationEnvironment(bailout->environment());
-      }
-    }
-  }
-  current_instruction_ = old_current;
-}
-
-
-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::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) {
-  ASSERT(instr->representation().IsDouble());
-  ASSERT(instr->left()->representation().IsDouble());
-  ASSERT(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) {
-  ASSERT((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().
-  ASSERT(instr->representation().IsSmiOrTagged());
-  ASSERT(left->representation().IsSmiOrTagged());
-  ASSERT(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()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    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()) {
-    ASSERT(instr->left()->representation().IsExternal());
-    ASSERT(instr->right()->representation().IsInteger32());
-    ASSERT(!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 {
-    ASSERT(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()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    ASSERT(instr->CheckFlag(HValue::kTruncatingToInt32));
-
-    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) {
-  LOperand* value = UseRegisterOrConstantAtStart(instr->index());
-  LOperand* length = UseRegister(instr->length());
-  return AssignEnvironment(new(zone()) LBoundsCheck(value, length));
-}
-
-
-LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
-  LInstruction* goto_instr = CheckElideControlInstruction(instr);
-  if (goto_instr != NULL) return goto_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 {
-    ASSERT(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.
-      ASSERT(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) {
-  const CallInterfaceDescriptor* descriptor = instr->descriptor();
-
-  LOperand* target = UseRegisterOrConstantAtStart(instr->target());
-  ZoneList<LOperand*> ops(instr->OperandCount(), zone());
-  ops.Add(target, zone());
-  for (int i = 1; i < instr->OperandCount(); i++) {
-    LOperand* op = UseFixed(instr->OperandAt(i),
-        descriptor->GetParameterRegister(i - 1));
-    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);
-  LCallFunction* call = new(zone()) LCallFunction(context, function);
-  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();
-
-  if (from.IsSmi()) {
-    if (to.IsTagged()) {
-      LOperand* value = UseRegister(instr->value());
-      return DefineSameAsFirst(new(zone()) LDummyUse(value));
-    }
-    from = Representation::Tagged();
-  }
-
-  if (from.IsTagged()) {
-    if (to.IsDouble()) {
-      LOperand* value = UseRegister(instr->value());
-      LOperand* temp = TempRegister();
-      LNumberUntagD* res = new(zone()) LNumberUntagD(value, temp);
-      return AssignEnvironment(DefineAsRegister(res));
-    } else if (to.IsSmi()) {
-      LOperand* value = UseRegister(instr->value());
-      if (instr->value()->type().IsSmi()) {
-        return DefineSameAsFirst(new(zone()) LDummyUse(value));
-      }
-      return AssignEnvironment(DefineSameAsFirst(new(zone()) LCheckSmi(value)));
-    } else {
-      ASSERT(to.IsInteger32());
-      LInstruction* res = NULL;
-
-      if (instr->value()->type().IsSmi() ||
-          instr->value()->representation().IsSmi()) {
-        LOperand* value = UseRegisterAtStart(instr->value());
-        res = DefineAsRegister(new(zone()) LSmiUntag(value, false));
-      } else {
-        LOperand* value = UseRegister(instr->value());
-        LOperand* temp1 = TempRegister();
-        LOperand* temp2 =
-            instr->CanTruncateToInt32() ? TempRegister() : FixedTemp(d24);
-        res = DefineAsRegister(new(zone()) LTaggedToI(value, temp1, temp2));
-        res = AssignEnvironment(res);
-      }
-
-      return res;
-    }
-  } else if (from.IsDouble()) {
-    if (to.IsTagged()) {
-      info()->MarkAsDeferredCalling();
-      LOperand* value = UseRegister(instr->value());
-      LOperand* temp1 = TempRegister();
-      LOperand* temp2 = TempRegister();
-
-      LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
-      return AssignPointerMap(DefineAsRegister(result));
-    } else {
-      ASSERT(to.IsSmi() || to.IsInteger32());
-      LOperand* value = UseRegister(instr->value());
-
-      if (instr->CanTruncateToInt32()) {
-        LTruncateDoubleToIntOrSmi* result =
-            new(zone()) LTruncateDoubleToIntOrSmi(value);
-        return DefineAsRegister(result);
-      } else {
-        LDoubleToIntOrSmi* result = new(zone()) LDoubleToIntOrSmi(value);
-        return AssignEnvironment(DefineAsRegister(result));
-      }
-    }
-  } else if (from.IsInteger32()) {
-    info()->MarkAsDeferredCalling();
-    if (to.IsTagged()) {
-      if (instr->value()->CheckFlag(HInstruction::kUint32)) {
-        LOperand* value = UseRegister(instr->value());
-        LNumberTagU* result = new(zone()) LNumberTagU(value,
-                                                      TempRegister(),
-                                                      TempRegister());
-        return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-      } else {
-        STATIC_ASSERT((kMinInt == Smi::kMinValue) &&
-                      (kMaxInt == Smi::kMaxValue));
-        LOperand* value = UseRegisterAtStart(instr->value());
-        return DefineAsRegister(new(zone()) LSmiTag(value));
-      }
-    } else if (to.IsSmi()) {
-      LOperand* value = UseRegisterAtStart(instr->value());
-      LInstruction* result = DefineAsRegister(new(zone()) LSmiTag(value));
-      if (instr->value()->CheckFlag(HInstruction::kUint32)) {
-        result = AssignEnvironment(result);
-      }
-      return result;
-    } else {
-      ASSERT(to.IsDouble());
-      if (instr->value()->CheckFlag(HInstruction::kUint32)) {
-        return DefineAsRegister(
-            new(zone()) LUint32ToDouble(UseRegisterAtStart(instr->value())));
-      } else {
-        return DefineAsRegister(
-            new(zone()) LInteger32ToDouble(UseRegisterAtStart(instr->value())));
-      }
-    }
-  }
-
-  UNREACHABLE();
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckValue(value));
-}
-
-
-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->CanOmitMapChecks()) {
-    // LCheckMaps does nothing in this case.
-    return new(zone()) LCheckMaps(NULL);
-  } else {
-    LOperand* value = UseRegisterAtStart(instr->value());
-    LOperand* temp = TempRegister();
-
-    if (instr->has_migration_target()) {
-      info()->MarkAsDeferredCalling();
-      LInstruction* result = new(zone()) LCheckMaps(value, temp);
-      return AssignPointerMap(AssignEnvironment(result));
-    } else {
-      return AssignEnvironment(new(zone()) LCheckMaps(value, temp));
-    }
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
-}
-
-
-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 {
-    ASSERT(input_rep.IsSmiOrTagged());
-    return AssignEnvironment(
-        DefineAsRegister(new(zone()) LClampTToUint8(reg,
-                                                    TempRegister(),
-                                                    FixedTemp(d24))));
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
-    HClassOfTestAndBranch* instr) {
-  ASSERT(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()) {
-    ASSERT(instr->left()->representation().Equals(r));
-    ASSERT(instr->right()->representation().Equals(r));
-    LOperand* left = UseRegisterOrConstantAtStart(instr->left());
-    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-    return new(zone()) LCompareNumericAndBranch(left, right);
-  } else {
-    ASSERT(r.IsDouble());
-    ASSERT(instr->left()->representation().IsDouble());
-    ASSERT(instr->right()->representation().IsDouble());
-    // TODO(all): In fact the only case that we can handle more efficiently is
-    // when one of the operand is the constant 0. Currently the MacroAssembler
-    // will be able to cope with any constant by loading it into an internal
-    // scratch register. This means that if the constant is used more that once,
-    // it will be loaded multiple times. Unfortunatly crankshaft already
-    // duplicates constant loads, but we should modify the code below once this
-    // issue has been addressed in crankshaft.
-    LOperand* left = UseRegisterOrConstantAtStart(instr->left());
-    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-    return new(zone()) LCompareNumericAndBranch(left, right);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
-  ASSERT(instr->left()->representation().IsTagged());
-  ASSERT(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) {
-  LInstruction* goto_instr = CheckElideControlInstruction(instr);
-  if (goto_instr != NULL) return goto_instr;
-
-  LOperand* left = UseRegisterAtStart(instr->left());
-  LOperand* right = UseRegisterAtStart(instr->right());
-  return new(zone()) LCmpObjectEqAndBranch(left, right);
-}
-
-
-LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
-  LInstruction* goto_instr = CheckElideControlInstruction(instr);
-  if (goto_instr != NULL) return goto_instr;
-
-  ASSERT(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, CAN_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) {
-  ASSERT(instr->representation().IsInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(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) {
-  ASSERT(instr->representation().IsInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(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) {
-  ASSERT(instr->representation().IsSmiOrInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(instr->right()->representation().Equals(instr->representation()));
-  LOperand* dividend = UseRegister(instr->left());
-  LOperand* divisor = UseRegister(instr->right());
-  LOperand* temp = instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)
-      ? NULL : TempRegister();
-  LDivI* div = new(zone()) LDivI(dividend, divisor, temp);
-  return AssignEnvironment(DefineAsRegister(div));
-}
-
-
-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();
-  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->set_entry(instr);
-  current_block_->UpdateEnvironment(inner);
-  chunk_->AddInlinedClosure(instr->closure());
-  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::DoFunctionLiteral(HFunctionLiteral* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(
-      DefineFixed(new(zone()) LFunctionLiteral(context), x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
-    HGetCachedArrayIndex* instr) {
-  ASSERT(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) {
-  ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LHasCachedArrayIndexAndBranch(
-      UseRegisterAtStart(instr->value()), TempRegister());
-}
-
-
-LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
-    HHasInstanceTypeAndBranch* instr) {
-  ASSERT(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* context = UseFixed(instr->context(), cp);
-  LInstanceOf* result = new(zone()) LInstanceOf(
-      context,
-      UseFixed(instr->left(), InstanceofStub::left()),
-      UseFixed(instr->right(), InstanceofStub::right()));
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
-    HInstanceOfKnownGlobal* instr) {
-  LInstanceOfKnownGlobal* result = new(zone()) LInstanceOfKnownGlobal(
-      UseFixed(instr->context(), cp),
-      UseFixed(instr->left(), InstanceofStub::left()));
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-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) {
-  LInstruction* goto_instr = CheckElideControlInstruction(instr);
-  if (goto_instr != NULL) return goto_instr;
-  LOperand* value = UseRegister(instr->value());
-  LOperand* scratch = TempRegister();
-  return new(zone()) LCompareMinusZeroAndBranch(value, scratch);
-}
-
-
-LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  return new(zone()) LIsObjectAndBranch(value, temp1, temp2);
-}
-
-
-LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* temp = TempRegister();
-  return new(zone()) LIsStringAndBranch(value, temp);
-}
-
-
-LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LIsSmiAndBranch(UseRegisterAtStart(instr->value()));
-}
-
-
-LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
-    HIsUndetectableAndBranch* instr) {
-  ASSERT(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);
-    ASSERT(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));
-  return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
-}
-
-
-LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
-    HLoadFunctionPrototype* instr) {
-  LOperand* function = UseRegister(instr->function());
-  LOperand* temp = TempRegister();
-  return AssignEnvironment(DefineAsRegister(
-      new(zone()) LLoadFunctionPrototype(function, temp)));
-}
-
-
-LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
-  LLoadGlobalCell* result = new(zone()) LLoadGlobalCell();
-  return instr->RequiresHoleCheck()
-      ? AssignEnvironment(DefineAsRegister(result))
-      : DefineAsRegister(result);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* global_object = UseFixed(instr->global_object(), x0);
-  LLoadGlobalGeneric* result =
-      new(zone()) LLoadGlobalGeneric(context, global_object);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
-  ASSERT(instr->key()->representation().IsSmiOrInteger32());
-  ElementsKind elements_kind = instr->elements_kind();
-  LOperand* elements = UseRegister(instr->elements());
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
-
-  if (!instr->is_typed_elements()) {
-    if (instr->representation().IsDouble()) {
-      LOperand* temp = (!instr->key()->IsConstant() ||
-                        instr->RequiresHoleCheck())
-             ? TempRegister()
-             : NULL;
-
-      LLoadKeyedFixedDouble* result =
-          new(zone()) LLoadKeyedFixedDouble(elements, key, temp);
-      return instr->RequiresHoleCheck()
-          ? AssignEnvironment(DefineAsRegister(result))
-          : DefineAsRegister(result);
-    } else {
-      ASSERT(instr->representation().IsSmiOrTagged() ||
-             instr->representation().IsInteger32());
-      LOperand* temp = instr->key()->IsConstant() ? NULL : TempRegister();
-      LLoadKeyedFixed* result =
-          new(zone()) LLoadKeyedFixed(elements, key, temp);
-      return instr->RequiresHoleCheck()
-          ? AssignEnvironment(DefineAsRegister(result))
-          : DefineAsRegister(result);
-    }
-  } else {
-    ASSERT((instr->representation().IsInteger32() &&
-            !IsDoubleOrFloatElementsKind(instr->elements_kind())) ||
-           (instr->representation().IsDouble() &&
-            IsDoubleOrFloatElementsKind(instr->elements_kind())));
-
-    LOperand* temp = instr->key()->IsConstant() ? NULL : TempRegister();
-    LLoadKeyedExternal* result =
-        new(zone()) LLoadKeyedExternal(elements, key, temp);
-    // An unsigned int array load might overflow and cause a deopt. Make sure it
-    // has an environment.
-    if (instr->RequiresHoleCheck() ||
-        elements_kind == EXTERNAL_UINT32_ELEMENTS ||
-        elements_kind == UINT32_ELEMENTS) {
-      return AssignEnvironment(DefineAsRegister(result));
-    } else {
-      return DefineAsRegister(result);
-    }
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseFixed(instr->object(), x1);
-  LOperand* key = UseFixed(instr->key(), x0);
-
-  LInstruction* result =
-      DefineFixed(new(zone()) LLoadKeyedGeneric(context, object, key), 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(), x0);
-  LInstruction* result =
-      DefineFixed(new(zone()) LLoadNamedGeneric(context, object), 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) {
-  ASSERT(instr->representation().IsInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(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) {
-  ASSERT(instr->representation().IsInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(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()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    left = UseRegisterAtStart(instr->BetterLeftOperand());
-    right = UseRegisterOrConstantAtStart(instr->BetterRightOperand());
-  } else {
-    ASSERT(instr->representation().IsDouble());
-    ASSERT(instr->left()->representation().IsDouble());
-    ASSERT(instr->right()->representation().IsDouble());
-    left = UseRegisterAtStart(instr->left());
-    right = UseRegisterAtStart(instr->right());
-  }
-  return DefineAsRegister(new(zone()) LMathMinMax(left, right));
-}
-
-
-LInstruction* LChunkBuilder::DoModByPowerOf2I(HMod* instr) {
-  ASSERT(instr->representation().IsInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(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::kBailoutOnMinusZero)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoModByConstI(HMod* instr) {
-  ASSERT(instr->representation().IsInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(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) {
-  ASSERT(instr->representation().IsSmiOrInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(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()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-
-    bool can_overflow = instr->CheckFlag(HValue::kCanOverflow);
-    bool bailout_on_minus_zero = instr->CheckFlag(HValue::kBailoutOnMinusZero);
-    bool needs_environment = can_overflow || bailout_on_minus_zero;
-
-    HValue* least_const = instr->BetterLeftOperand();
-    HValue* most_const = instr->BetterRightOperand();
-
-    LOperand* left = UseRegisterAtStart(least_const);
-
-    // LMulConstI can handle a subset of constants:
-    //  With support for overflow detection:
-    //    -1, 0, 1, 2
-    //  Without support for overflow detection:
-    //    2^n, -(2^n)
-    //    2^n + 1, -(2^n - 1)
-    if (most_const->IsConstant()) {
-      int32_t constant = HConstant::cast(most_const)->Integer32Value();
-      int32_t constant_abs = (constant >= 0) ? constant : -constant;
-
-      if (((constant >= -1) && (constant <= 2)) ||
-          (!can_overflow && (IsPowerOf2(constant_abs) ||
-                             IsPowerOf2(constant_abs + 1) ||
-                             IsPowerOf2(constant_abs - 1)))) {
-        LConstantOperand* right = UseConstant(most_const);
-        LMulConstIS* mul = new(zone()) LMulConstIS(left, right);
-        if (needs_environment) AssignEnvironment(mul);
-        return DefineAsRegister(mul);
-      }
-    }
-
-    // LMulI/S can handle all cases, but it requires that a register is
-    // allocated for the second operand.
-    LInstruction* result;
-    if (instr->representation().IsSmi()) {
-      LOperand* right = UseRegisterAtStart(most_const);
-      result = DefineAsRegister(new(zone()) LMulS(left, right));
-    } else {
-      LOperand* right = UseRegisterAtStart(most_const);
-      result = DefineAsRegister(new(zone()) LMulI(left, right));
-    }
-    if (needs_environment) 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) {
-  ASSERT(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 {
-    ASSERT(info()->IsStub());
-    CodeStubInterfaceDescriptor* descriptor =
-        info()->code_stub()->GetInterfaceDescriptor(info()->isolate());
-    int index = static_cast<int>(instr->index());
-    Register reg = descriptor->GetParameterRegister(index);
-    return DefineFixed(result, reg);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoPower(HPower* instr) {
-  ASSERT(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();
-  ASSERT(instr->left()->representation().IsDouble());
-  LOperand* left = UseFixedDouble(instr->left(), d0);
-  LOperand* right = exponent_type.IsInteger32()
-                        ? UseFixed(instr->right(), x12)
-                        : exponent_type.IsDouble()
-                            ? UseFixedDouble(instr->right(), d1)
-                            : UseFixed(instr->right(), x11);
-  LPower* result = new(zone()) LPower(left, right);
-  return MarkAsCall(DefineFixedDouble(result, d0),
-                    instr,
-                    CAN_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoPushArgument(HPushArgument* instr) {
-  LOperand* argument = UseRegister(instr->argument());
-  return new(zone()) LPushArgument(argument);
-}
-
-
-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();
-  ASSERT(value->representation().IsDouble());
-  return DefineAsRegister(new(zone()) LDoubleBits(UseRegister(value)));
-}
-
-
-LInstruction* LChunkBuilder::DoConstructDouble(HConstructDouble* instr) {
-  LOperand* lo = UseRegister(instr->lo());
-  LOperand* hi = UseRegister(instr->hi());
-  LOperand* temp = TempRegister();
-  return DefineAsRegister(new(zone()) LConstructDouble(hi, lo, temp));
-}
-
-
-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);
-}
-
-
-LInstruction* LChunkBuilder::DoShift(Token::Value op,
-                                     HBitwiseBinaryOperation* instr) {
-  if (instr->representation().IsTagged()) {
-    return DoArithmeticT(op, instr);
-  }
-
-  ASSERT(instr->representation().IsInteger32() ||
-         instr->representation().IsSmi());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(instr->right()->representation().Equals(instr->representation()));
-
-  LOperand* left = instr->representation().IsSmi()
-      ? UseRegister(instr->left())
-      : UseRegisterAtStart(instr->left());
-
-  HValue* right_value = instr->right();
-  LOperand* right = NULL;
-  LOperand* temp = NULL;
-  int constant_value = 0;
-  if (right_value->IsConstant()) {
-    right = UseConstant(right_value);
-    HConstant* constant = HConstant::cast(right_value);
-    constant_value = constant->Integer32Value() & 0x1f;
-  } else {
-    right = UseRegisterAtStart(right_value);
-    if (op == Token::ROR) {
-      temp = TempRegister();
-    }
-  }
-
-  // Shift operations can only deoptimize if we do a logical shift by 0 and the
-  // result cannot be truncated to int32.
-  bool does_deopt = false;
-  if ((op == Token::SHR) && (constant_value == 0)) {
-    if (FLAG_opt_safe_uint32_operations) {
-      does_deopt = !instr->CheckFlag(HInstruction::kUint32);
-    } else {
-      does_deopt = !instr->CheckUsesForFlag(HValue::kTruncatingToInt32);
-    }
-  }
-
-  LInstruction* result;
-  if (instr->representation().IsInteger32()) {
-    result = DefineAsRegister(new(zone()) LShiftI(op, left, right, does_deopt));
-  } else {
-    ASSERT(instr->representation().IsSmi());
-    result = DefineAsRegister(
-        new(zone()) LShiftS(op, left, right, temp, does_deopt));
-  }
-
-  return does_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 {
-    ASSERT(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);
-  return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
-}
-
-
-LInstruction* LChunkBuilder::DoStoreGlobalCell(HStoreGlobalCell* instr) {
-  LOperand* value = UseRegister(instr->value());
-  if (instr->RequiresHoleCheck()) {
-    return AssignEnvironment(new(zone()) LStoreGlobalCell(value,
-                                                          TempRegister(),
-                                                          TempRegister()));
-  } else {
-    return new(zone()) LStoreGlobalCell(value, TempRegister(), NULL);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
-  LOperand* temp = NULL;
-  LOperand* elements = NULL;
-  LOperand* val = NULL;
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
-
-  if (!instr->is_typed_elements() &&
-      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_typed_elements()) {
-    ASSERT((instr->value()->representation().IsInteger32() &&
-            !IsDoubleOrFloatElementsKind(instr->elements_kind())) ||
-           (instr->value()->representation().IsDouble() &&
-            IsDoubleOrFloatElementsKind(instr->elements_kind())));
-    ASSERT((instr->is_fixed_typed_array() &&
-            instr->elements()->representation().IsTagged()) ||
-           (instr->is_external() &&
-            instr->elements()->representation().IsExternal()));
-    return new(zone()) LStoreKeyedExternal(elements, key, val, temp);
-
-  } else if (instr->value()->representation().IsDouble()) {
-    ASSERT(instr->elements()->representation().IsTagged());
-    return new(zone()) LStoreKeyedFixedDouble(elements, key, val, temp);
-
-  } else {
-    ASSERT(instr->elements()->representation().IsTagged());
-    ASSERT(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(), x2);
-  LOperand* key = UseFixed(instr->key(), x1);
-  LOperand* value = UseFixed(instr->value(), x0);
-
-  ASSERT(instr->object()->representation().IsTagged());
-  ASSERT(instr->key()->representation().IsTagged());
-  ASSERT(instr->value()->representation().IsTagged());
-
-  return MarkAsCall(
-      new(zone()) LStoreKeyedGeneric(context, object, key, value), 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() ||
-      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();
-  }
-
-  LStoreNamedField* result =
-      new(zone()) LStoreNamedField(object, value, temp0, temp1);
-  if (instr->field_representation().IsHeapObject() &&
-      !instr->value()->type().IsHeapObject()) {
-    return AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseFixed(instr->object(), x1);
-  LOperand* value = UseFixed(instr->value(), x0);
-  LInstruction* result = new(zone()) LStoreNamedGeneric(context, object, 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 AssignEnvironment(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) {
-  ASSERT(instr->left()->representation().IsTagged());
-  ASSERT(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()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    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) {
-  LOperand* object = UseRegister(instr->object());
-  if (IsSimpleMapChangeTransition(instr->from_kind(), instr->to_kind())) {
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, NULL,
-                                            TempRegister(), TempRegister());
-    return result;
-  } else {
-    LOperand* context = UseFixed(instr->context(), cp);
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, context, TempRegister());
-    return AssignPointerMap(result);
-  }
-}
-
-
-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::DoTypeof(HTypeof* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  // TODO(jbramley): In ARM, this uses UseFixed to force the input to x0.
-  // However, LCodeGen::DoTypeof just pushes it to the stack (for CallRuntime)
-  // anyway, so the input doesn't have to be in x0. We might be able to improve
-  // the ARM back-end a little by relaxing this restriction.
-  LTypeof* result =
-      new(zone()) LTypeof(context, UseRegisterAtStart(instr->value()));
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoTypeofIsAndBranch(HTypeofIsAndBranch* instr) {
-  LInstruction* goto_instr = CheckElideControlInstruction(instr);
-  if (goto_instr != NULL) return goto_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();
-        LMathAbsTagged* result =
-            new(zone()) LMathAbsTagged(context, input, temp1, temp2, temp3);
-        return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-      } else {
-        LOperand* input = UseRegisterAtStart(instr->value());
-        LMathAbs* result = new(zone()) LMathAbs(input);
-        if (r.IsDouble()) {
-          // The Double case can never fail so it doesn't need an environment.
-          return DefineAsRegister(result);
-        } else {
-          ASSERT(r.IsInteger32() || r.IsSmi());
-          // The Integer32 and Smi cases need an environment because they can
-          // deoptimize on minimum representable number.
-          return AssignEnvironment(DefineAsRegister(result));
-        }
-      }
-    }
-    case kMathExp: {
-      ASSERT(instr->representation().IsDouble());
-      ASSERT(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegister(instr->value());
-      // TODO(all): Implement TempFPRegister.
-      LOperand* double_temp1 = FixedTemp(d24);   // This was chosen arbitrarily.
-      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: {
-      ASSERT(instr->representation().IsInteger32());
-      ASSERT(instr->value()->representation().IsDouble());
-      // TODO(jbramley): A64 can easily handle a double argument with frintm,
-      // but we're never asked for it here. At the moment, we fall back to the
-      // runtime if the result doesn't fit, like the other architectures.
-      LOperand* input = UseRegisterAtStart(instr->value());
-      LMathFloor* result = new(zone()) LMathFloor(input);
-      return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-    }
-    case kMathLog: {
-      ASSERT(instr->representation().IsDouble());
-      ASSERT(instr->value()->representation().IsDouble());
-      LOperand* input = UseFixedDouble(instr->value(), d0);
-      LMathLog* result = new(zone()) LMathLog(input);
-      return MarkAsCall(DefineFixedDouble(result, d0), instr);
-    }
-    case kMathPowHalf: {
-      ASSERT(instr->representation().IsDouble());
-      ASSERT(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegister(instr->value());
-      return DefineAsRegister(new(zone()) LMathPowHalf(input));
-    }
-    case kMathRound: {
-      ASSERT(instr->representation().IsInteger32());
-      ASSERT(instr->value()->representation().IsDouble());
-      // TODO(jbramley): As with kMathFloor, we can probably handle double
-      // results fairly easily, but we are never asked for them.
-      LOperand* input = UseRegister(instr->value());
-      LOperand* temp = FixedTemp(d24);  // Choosen arbitrarily.
-      LMathRound* result = new(zone()) LMathRound(input, temp);
-      return AssignEnvironment(DefineAsRegister(result));
-    }
-    case kMathSqrt: {
-      ASSERT(instr->representation().IsDouble());
-      ASSERT(instr->value()->representation().IsDouble());
-      LOperand* input = UseRegisterAtStart(instr->value());
-      return DefineAsRegister(new(zone()) LMathSqrt(input));
-    }
-    case kMathClz32: {
-      ASSERT(instr->representation().IsInteger32());
-      ASSERT(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) {
-      Abort(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 = UseRegister(instr->index());
-  return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
-}
-
-
-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));
-}
-
-
-} }  // namespace v8::internal