Experimental parser: merge to r19637

src/a64/lithium-a64.cc

-// Copyright 2012 the V8 project authors. All rights reserved.
+// 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 "arm/lithium-arm.h"
-#include "arm/lithium-codegen-arm.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);
@@ skipping 17 matching lines @@
     }
   }
 }
 
 
 void LInstruction::PrintOutputOperandTo(StringStream* stream) {
   if (HasResult()) result()->PrintTo(stream);
 }
 
 
-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 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()) {
+    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;
@@ skipping 15 matching lines @@
     case Token::SHL: return "shl-t";
     case Token::SAR: return "sar-t";
     case Token::SHR: return "shr-t";
     default:
       UNREACHABLE();
       return NULL;
   }
 }
 
 
-bool LGoto::HasInterestingComment(LCodeGen* gen) const {
-  return !gen->IsNextEmittedBlock(block_id());
+void LChunkBuilder::Abort(BailoutReason reason) {
+  info()->set_bailout_reason(reason);
+  status_ = ABORTED;
 }
 
 
-void LGoto::PrintDataTo(StringStream* stream) {
-  stream->Add("B%d", block_id());
+LUnallocated* LChunkBuilder::ToUnallocated(Register reg) {
+  return new(zone()) LUnallocated(LUnallocated::FIXED_REGISTER,
+                                  Register::ToAllocationIndex(reg));
 }
 
 
-void LBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("B%d | B%d on ", true_block_id(), false_block_id());
-  value()->PrintTo(stream);
+LUnallocated* LChunkBuilder::ToUnallocated(DoubleRegister reg) {
+  return new(zone()) LUnallocated(LUnallocated::FIXED_DOUBLE_REGISTER,
+                                  DoubleRegister::ToAllocationIndex(reg));
 }
 
 
-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());
+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;
 }
 
 
-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());
+LOperand* LChunkBuilder::UseFixed(HValue* value, Register fixed_register) {
+  return Use(value, ToUnallocated(fixed_register));
 }
 
 
-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());
+LOperand* LChunkBuilder::UseFixedDouble(HValue* value,
+                                        DoubleRegister fixed_register) {
+  return Use(value, ToUnallocated(fixed_register));
 }
 
 
-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());
+LOperand* LChunkBuilder::UseRegister(HValue* value) {
+  return Use(value, new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
 }
 
 
-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());
+LOperand* LChunkBuilder::UseRegisterAndClobber(HValue* value) {
+  return Use(value, new(zone()) LUnallocated(LUnallocated::WRITABLE_REGISTER));
 }
 
 
-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());
+LOperand* LChunkBuilder::UseRegisterAtStart(HValue* value) {
+  return Use(value,
+             new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER,
+                                      LUnallocated::USED_AT_START));
 }
 
 
-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());
+LOperand* LChunkBuilder::UseRegisterOrConstant(HValue* value) {
+  return value->IsConstant() ? UseConstant(value) : UseRegister(value);
 }
 
 
-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());
+LOperand* LChunkBuilder::UseRegisterOrConstantAtStart(HValue* value) {
+  return value->IsConstant() ? UseConstant(value) : UseRegisterAtStart(value);
 }
 
 
-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());
+LConstantOperand* LChunkBuilder::UseConstant(HValue* value) {
+  return chunk_->DefineConstantOperand(HConstant::cast(value));
 }
 
 
-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());
+LOperand* LChunkBuilder::UseAny(HValue* value) {
+  return value->IsConstant()
+      ? UseConstant(value)
+      : Use(value, new(zone()) LUnallocated(LUnallocated::ANY));
 }
 
 
-void LStoreCodeEntry::PrintDataTo(StringStream* stream) {
-  stream->Add(" = ");
-  function()->PrintTo(stream);
-  stream->Add(".code_entry = ");
-  code_object()->PrintTo(stream);
+LInstruction* LChunkBuilder::Define(LTemplateResultInstruction<1>* instr,
+                                    LUnallocated* result) {
+  result->set_virtual_register(current_instruction_->id());
+  instr->set_result(result);
+  return instr;
 }
 
 
-void LInnerAllocatedObject::PrintDataTo(StringStream* stream) {
-  stream->Add(" = ");
-  base_object()->PrintTo(stream);
-  stream->Add(" + ");
-  offset()->PrintTo(stream);
+LInstruction* LChunkBuilder::DefineAsRegister(
+    LTemplateResultInstruction<1>* instr) {
+  return Define(instr,
+                new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
 }
 
 
-void LCallJSFunction::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  function()->PrintTo(stream);
-  stream->Add("#%d / ", arity());
+LInstruction* LChunkBuilder::DefineAsSpilled(
+    LTemplateResultInstruction<1>* instr, int index) {
+  return Define(instr,
+                new(zone()) LUnallocated(LUnallocated::FIXED_SLOT, index));
 }
 
 
-void LCallWithDescriptor::PrintDataTo(StringStream* stream) {
-  for (int i = 0; i < InputCount(); i++) {
-    InputAt(i)->PrintTo(stream);
-    stream->Add(" ");
-  }
-  stream->Add("#%d / ", arity());
+LInstruction* LChunkBuilder::DefineSameAsFirst(
+    LTemplateResultInstruction<1>* instr) {
+  return Define(instr,
+                new(zone()) LUnallocated(LUnallocated::SAME_AS_FIRST_INPUT));
 }
 
 
-void LLoadContextSlot::PrintDataTo(StringStream* stream) {
-  context()->PrintTo(stream);
-  stream->Add("[%d]", slot_index());
+LInstruction* LChunkBuilder::DefineFixed(
+    LTemplateResultInstruction<1>* instr, Register reg) {
+  return Define(instr, ToUnallocated(reg));
 }
 
 
-void LStoreContextSlot::PrintDataTo(StringStream* stream) {
-  context()->PrintTo(stream);
-  stream->Add("[%d] <- ", slot_index());
-  value()->PrintTo(stream);
+LInstruction* LChunkBuilder::DefineFixedDouble(
+    LTemplateResultInstruction<1>* instr, DoubleRegister reg) {
+  return Define(instr, ToUnallocated(reg));
 }
 
 
-void LInvokeFunction::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  function()->PrintTo(stream);
-  stream->Add(" #%d / ", arity());
+LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
+                                        HInstruction* hinstr,
+                                        CanDeoptimize can_deoptimize) {
+  info()->MarkAsNonDeferredCalling();
+#ifdef DEBUG
+  instr->VerifyCall();
+#endif
+  instr->MarkAsCall();
+  instr = AssignPointerMap(instr);
+
+  if (hinstr->HasObservableSideEffects()) {
+    ASSERT(hinstr->next()->IsSimulate());
+    HSimulate* sim = HSimulate::cast(hinstr->next());
+    ASSERT(instruction_pending_deoptimization_environment_ == NULL);
+    ASSERT(pending_deoptimization_ast_id_.IsNone());
+    instruction_pending_deoptimization_environment_ = instr;
+    pending_deoptimization_ast_id_ = sim->ast_id();
+  }
+
+  // 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;
 }
 
 
-void LCallNew::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  constructor()->PrintTo(stream);
-  stream->Add(" #%d / ", arity());
+LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
+  ASSERT(!instr->HasPointerMap());
+  instr->set_pointer_map(new(zone()) LPointerMap(zone()));
+  return instr;
 }
 
 
-void LCallNewArray::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  constructor()->PrintTo(stream);
-  stream->Add(" #%d / ", arity());
-  ElementsKind kind = hydrogen()->elements_kind();
-  stream->Add(" (%s) ", ElementsKindToString(kind));
+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;
 }
 
 
-void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
-  arguments()->PrintTo(stream);
-  stream->Add(" length ");
-  length()->PrintTo(stream);
-  stream->Add(" index ");
-  index()->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 LLoadKeyed::PrintDataTo(StringStream* stream) {
-  elements()->PrintTo(stream);
-  stream->Add("[");
-  key()->PrintTo(stream);
-  if (hydrogen()->IsDehoisted()) {
-    stream->Add(" + %d]", additional_index());
-  } else {
-    stream->Add("]");
-  }
-}
-
-
-void LStoreKeyed::PrintDataTo(StringStream* stream) {
-  elements()->PrintTo(stream);
-  stream->Add("[");
-  key()->PrintTo(stream);
-  if (hydrogen()->IsDehoisted()) {
-    stream->Add(" + %d] <-", additional_index());
-  } else {
-    stream->Add("] <- ");
-  }
-
-  if (value() == NULL) {
-    ASSERT(hydrogen()->IsConstantHoleStore() &&
-           hydrogen()->value()->representation().IsDouble());
-    stream->Add("<the hole(nan)>");
-  } else {
-    value()->PrintTo(stream);
-  }
-}
-
-
-void LStoreKeyedGeneric::PrintDataTo(StringStream* stream) {
-  object()->PrintTo(stream);
-  stream->Add("[");
-  key()->PrintTo(stream);
-  stream->Add("] <- ");
-  value()->PrintTo(stream);
-}
-
-
-void LTransitionElementsKind::PrintDataTo(StringStream* stream) {
-  object()->PrintTo(stream);
-  stream->Add(" %p -> %p", *original_map(), *transitioned_map());
-}
-
-
-int LPlatformChunk::GetNextSpillIndex(RegisterKind kind) {
-  // Skip a slot if for a double-width slot.
-  if (kind == DOUBLE_REGISTERS) spill_slot_count_++;
+int LPlatformChunk::GetNextSpillIndex() {
   return spill_slot_count_++;
 }
 
 
-LOperand* LPlatformChunk::GetNextSpillSlot(RegisterKind kind)  {
-  int index = GetNextSpillIndex(kind);
+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());
+  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(GENERAL_REGISTERS);
+      chunk_->GetNextSpillIndex();
     }
   }
 
-  const ZoneList<HBasicBlock*>* blocks = graph()->blocks();
+  const ZoneList<HBasicBlock*>* blocks = graph_->blocks();
   for (int i = 0; i < blocks->length(); i++) {
-    HBasicBlock* next = NULL;
-    if (i < blocks->length() - 1) next = blocks->at(i + 1);
-    DoBasicBlock(blocks->at(i), next);
+    DoBasicBlock(blocks->at(i));
     if (is_aborted()) return NULL;
   }
   status_ = DONE;
   return chunk_;
 }
 
 
-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::UseFixed(HValue* value, Register fixed_register) {
-  return Use(value, ToUnallocated(fixed_register));
-}
-
-
-LOperand* LChunkBuilder::UseFixedDouble(HValue* value, DoubleRegister reg) {
-  return Use(value, ToUnallocated(reg));
-}
-
-
-LOperand* LChunkBuilder::UseRegister(HValue* value) {
-  return Use(value, new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
-}
-
-
-LOperand* LChunkBuilder::UseRegisterAtStart(HValue* value) {
-  return Use(value,
-             new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER,
-                                      LUnallocated::USED_AT_START));
-}
-
-
-LOperand* LChunkBuilder::UseTempRegister(HValue* value) {
-  return Use(value, new(zone()) LUnallocated(LUnallocated::WRITABLE_REGISTER));
-}
-
-
-LOperand* LChunkBuilder::Use(HValue* value) {
-  return Use(value, new(zone()) LUnallocated(LUnallocated::NONE));
-}
-
-
-LOperand* LChunkBuilder::UseAtStart(HValue* value) {
-  return Use(value, new(zone()) LUnallocated(LUnallocated::NONE,
-                                             LUnallocated::USED_AT_START));
-}
-
-
-LOperand* LChunkBuilder::UseOrConstant(HValue* value) {
-  return value->IsConstant()
-      ? chunk_->DefineConstantOperand(HConstant::cast(value))
-      : Use(value);
-}
-
-
-LOperand* LChunkBuilder::UseOrConstantAtStart(HValue* value) {
-  return value->IsConstant()
-      ? chunk_->DefineConstantOperand(HConstant::cast(value))
-      : UseAtStart(value);
-}
-
-
-LOperand* LChunkBuilder::UseRegisterOrConstant(HValue* value) {
-  return value->IsConstant()
-      ? chunk_->DefineConstantOperand(HConstant::cast(value))
-      : UseRegister(value);
-}
-
-
-LOperand* LChunkBuilder::UseRegisterOrConstantAtStart(HValue* value) {
-  return value->IsConstant()
-      ? chunk_->DefineConstantOperand(HConstant::cast(value))
-      : UseRegisterAtStart(value);
-}
-
-
-LOperand* LChunkBuilder::UseConstant(HValue* value) {
-  return chunk_->DefineConstantOperand(HConstant::cast(value));
-}
-
-
-LOperand* LChunkBuilder::UseAny(HValue* value) {
-  return value->IsConstant()
-      ? chunk_->DefineConstantOperand(HConstant::cast(value))
-      :  Use(value, new(zone()) LUnallocated(LUnallocated::ANY));
-}
-
-
-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;
-}
-
-
-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::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::MarkAsCall(LInstruction* instr,
-                                        HInstruction* hinstr,
-                                        CanDeoptimize can_deoptimize) {
-  info()->MarkAsNonDeferredCalling();
-#ifdef DEBUG
-  instr->VerifyCall();
-#endif
-  instr->MarkAsCall();
-  instr = AssignPointerMap(instr);
-
-  if (hinstr->HasObservableSideEffects()) {
-    ASSERT(hinstr->next()->IsSimulate());
-    HSimulate* sim = HSimulate::cast(hinstr->next());
-    ASSERT(instruction_pending_deoptimization_environment_ == NULL);
-    ASSERT(pending_deoptimization_ast_id_.IsNone());
-    instruction_pending_deoptimization_environment_ = instr;
-    pending_deoptimization_ast_id_ = sim->ast_id();
-  }
-
-  // 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;
-}
-
-
-LOperand* LChunkBuilder::FixedTemp(Register reg) {
-  LUnallocated* operand = ToUnallocated(reg);
-  ASSERT(operand->HasFixedPolicy());
-  return operand;
-}
-
-
-LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
-  LUnallocated* operand = ToUnallocated(reg);
-  ASSERT(operand->HasFixedPolicy());
-  return operand;
-}
-
-
-LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
-  return new(zone()) LLabel(instr->block());
-}
-
-
-LInstruction* LChunkBuilder::DoDummyUse(HDummyUse* instr) {
-  return DefineAsRegister(new(zone()) LDummyUse(UseAny(instr->value())));
-}
-
-
-LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
-  UNREACHABLE();
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
-  return AssignEnvironment(new(zone()) LDeoptimize);
-}
-
-
-LInstruction* LChunkBuilder::DoShift(Token::Value op,
-                                     HBitwiseBinaryOperation* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    LOperand* left = UseRegisterAtStart(instr->left());
-
-    HValue* right_value = instr->right();
-    LOperand* right = NULL;
-    int constant_value = 0;
-    bool does_deopt = false;
-    if (right_value->IsConstant()) {
-      HConstant* constant = HConstant::cast(right_value);
-      right = chunk_->DefineConstantOperand(constant);
-      constant_value = constant->Integer32Value() & 0x1f;
-      // Left shifts can deoptimize if we shift by > 0 and the result cannot be
-      // truncated to smi.
-      if (instr->representation().IsSmi() && constant_value > 0) {
-        does_deopt = !instr->CheckUsesForFlag(HValue::kTruncatingToSmi);
-      }
-    } else {
-      right = UseRegisterAtStart(right_value);
-    }
-
-    // Shift operations can only deoptimize if we do a logical shift
-    // by 0 and the result cannot be truncated to int32.
-    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 =
-        DefineAsRegister(new(zone()) LShiftI(op, left, right, does_deopt));
-    return does_deopt ? AssignEnvironment(result) : result;
-  } else {
-    return DoArithmeticT(op, instr);
-  }
-}
-
-
-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(op, 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) {
-  HValue* left = instr->left();
-  HValue* right = instr->right();
-  ASSERT(left->representation().IsTagged());
-  ASSERT(right->representation().IsTagged());
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* left_operand = UseFixed(left, r1);
-  LOperand* right_operand = UseFixed(right, r0);
-  LArithmeticT* result =
-      new(zone()) LArithmeticT(op, context, left_operand, right_operand);
-  return MarkAsCall(DefineFixed(result, r0), instr);
-}
-
-
-void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
+void LChunkBuilder::DoBasicBlock(HBasicBlock* block) {
   ASSERT(is_building());
   current_block_ = block;
-  next_block_ = next_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()) {
+      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()) {
+  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_);
-  next_block_ = NULL;
   current_block_ = NULL;
 }
 
 
 void LChunkBuilder::VisitInstruction(HInstruction* current) {
   HInstruction* old_current = current_instruction_;
   current_instruction_ = current;
-  if (current->has_position()) position_ = current->position();
 
   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
+    // 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;
@@ skipping 14 matching lines @@
     }
     if (FLAG_stress_environments && !instr->HasEnvironment()) {
       instr = AssignEnvironment(instr);
     }
     chunk_->AddInstruction(instr, current_block_);
   }
   current_instruction_ = old_current;
 }
 
 
-LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
-  return new(zone()) LGoto(instr->FirstSuccessor());
+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();
+  LAllocate* result = new(zone()) LAllocate(context, size, temp1, temp2);
+  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();
-  LBranch* result = new(zone()) LBranch(UseRegister(value));
-  // Tagged values that are not known smis or booleans require a
-  // deoptimization environment. If the instruction is generic no
-  // environment is needed since all cases are handled.
-  Representation rep = value->representation();
+  Representation r = value->representation();
   HType type = value->type();
-  ToBooleanStub::Types expected = instr->expected_input_types();
-  if (rep.IsTagged() && !type.IsSmi() && !type.IsBoolean() &&
-      !expected.IsGeneric()) {
-    return AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* instr) {
-  return new(zone()) LDebugBreak();
-}
-
-
-LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* temp = TempRegister();
-  return new(zone()) LCmpMapAndBranch(value, temp);
-}
-
-
-LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* instr) {
-  info()->MarkAsRequiresFrame();
-  LOperand* value = UseRegister(instr->value());
-  return DefineAsRegister(new(zone()) LArgumentsLength(value));
-}
-
-
-LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
-  info()->MarkAsRequiresFrame();
-  return DefineAsRegister(new(zone()) LArgumentsElements);
-}
-
-
-LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LInstanceOf* result =
-      new(zone()) LInstanceOf(context, UseFixed(instr->left(), r0),
-                              UseFixed(instr->right(), r1));
-  return MarkAsCall(DefineFixed(result, r0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
-    HInstanceOfKnownGlobal* instr) {
-  LInstanceOfKnownGlobal* result =
-      new(zone()) LInstanceOfKnownGlobal(
-          UseFixed(instr->context(), cp),
-          UseFixed(instr->left(), r0),
-          FixedTemp(r4));
-  return MarkAsCall(DefineFixed(result, r0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
-  LOperand* receiver = UseRegisterAtStart(instr->receiver());
-  LOperand* function = UseRegisterAtStart(instr->function());
-  LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
-  return AssignEnvironment(DefineAsRegister(result));
-}
-
-
-LInstruction* LChunkBuilder::DoApplyArguments(HApplyArguments* instr) {
-  LOperand* function = UseFixed(instr->function(), r1);
-  LOperand* receiver = UseFixed(instr->receiver(), r0);
-  LOperand* length = UseFixed(instr->length(), r2);
-  LOperand* elements = UseFixed(instr->elements(), r3);
-  LApplyArguments* result = new(zone()) LApplyArguments(function,
-                                                receiver,
-                                                length,
-                                                elements);
-  return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoPushArgument(HPushArgument* instr) {
-  LOperand* argument = Use(instr->argument());
-  return new(zone()) LPushArgument(argument);
-}
-
-
-LInstruction* LChunkBuilder::DoStoreCodeEntry(
-    HStoreCodeEntry* store_code_entry) {
-  LOperand* function = UseRegister(store_code_entry->function());
-  LOperand* code_object = UseTempRegister(store_code_entry->code_object());
-  return new(zone()) LStoreCodeEntry(function, code_object);
-}
-
-
-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::DoThisFunction(HThisFunction* instr) {
-  return instr->HasNoUses()
-      ? NULL
-      : DefineAsRegister(new(zone()) LThisFunction);
-}
-
-
-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::DoOuterContext(HOuterContext* instr) {
-  LOperand* context = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LOuterContext(context));
-}
-
-
-LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(new(zone()) LDeclareGlobals(context), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
-  LOperand* context = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LGlobalObject(context));
-}
-
-
-LInstruction* LChunkBuilder::DoGlobalReceiver(HGlobalReceiver* instr) {
-  LOperand* global_object = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LGlobalReceiver(global_object));
+
+  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(), r1);
+  LOperand* function = UseFixed(instr->function(), x1);
 
   LCallJSFunction* result = new(zone()) LCallJSFunction(function);
 
-  return MarkAsCall(DefineFixed(result, r0), instr);
-}
-
-
+  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, r0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* function = UseFixed(instr->function(), r1);
-  LInvokeFunction* result = new(zone()) LInvokeFunction(context, function);
-  return MarkAsCall(DefineFixed(result, r0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
-  switch (instr->op()) {
-    case kMathFloor: return DoMathFloor(instr);
-    case kMathRound: return DoMathRound(instr);
-    case kMathAbs: return DoMathAbs(instr);
-    case kMathLog: return DoMathLog(instr);
-    case kMathExp: return DoMathExp(instr);
-    case kMathSqrt: return DoMathSqrt(instr);
-    case kMathPowHalf: return DoMathPowHalf(instr);
-    default:
-      UNREACHABLE();
-      return NULL;
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoMathFloor(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegister(instr->value());
-  LMathFloor* result = new(zone()) LMathFloor(input);
-  return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-}
-
-
-LInstruction* LChunkBuilder::DoMathRound(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegister(instr->value());
-  LOperand* temp = FixedTemp(d3);
-  LMathRound* result = new(zone()) LMathRound(input, temp);
-  return AssignEnvironment(DefineAsRegister(result));
-}
-
-
-LInstruction* LChunkBuilder::DoMathAbs(HUnaryMathOperation* instr) {
-  Representation r = instr->value()->representation();
-  LOperand* context = (r.IsDouble() || r.IsSmiOrInteger32())
-      ? NULL
-      : UseFixed(instr->context(), cp);
-  LOperand* input = UseRegister(instr->value());
-  LMathAbs* result = new(zone()) LMathAbs(context, input);
-  return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-}
-
-
-LInstruction* LChunkBuilder::DoMathLog(HUnaryMathOperation* instr) {
-  ASSERT(instr->representation().IsDouble());
-  ASSERT(instr->value()->representation().IsDouble());
-  LOperand* input = UseFixedDouble(instr->value(), d0);
-  return MarkAsCall(DefineFixedDouble(new(zone()) LMathLog(input), d0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
-  ASSERT(instr->representation().IsDouble());
-  ASSERT(instr->value()->representation().IsDouble());
-  LOperand* input = UseRegister(instr->value());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LOperand* double_temp = FixedTemp(d3);  // Chosen by fair dice roll.
-  LMathExp* result = new(zone()) LMathExp(input, double_temp, temp1, temp2);
-  return DefineAsRegister(result);
-}
-
-
-LInstruction* LChunkBuilder::DoMathSqrt(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegisterAtStart(instr->value());
-  LMathSqrt* result = new(zone()) LMathSqrt(input);
-  return DefineAsRegister(result);
-}
-
-
-LInstruction* LChunkBuilder::DoMathPowHalf(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegisterAtStart(instr->value());
-  LMathPowHalf* result = new(zone()) LMathPowHalf(input);
-  return DefineAsRegister(result);
+  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);
-  LOperand* constructor = UseFixed(instr->constructor(), r1);
+  // 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, r0), instr);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoCallNewArray(HCallNewArray* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* constructor = UseFixed(instr->constructor(), r1);
+  // 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, r0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoCallFunction(HCallFunction* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* function = UseFixed(instr->function(), r1);
-  LCallFunction* call = new(zone()) LCallFunction(context, function);
-  LInstruction* result = DefineFixed(call, r0);
-  if (instr->IsTailCall()) return result;
-  return MarkAsCall(result, instr);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(DefineFixed(new(zone()) LCallRuntime(context), r0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoRor(HRor* instr) {
-  return DoShift(Token::ROR, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoShr(HShr* instr) {
-  return DoShift(Token::SHR, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoSar(HSar* instr) {
-  return DoShift(Token::SAR, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoShl(HShl* instr) {
-  return DoShift(Token::SHL, instr);
-}
-
-
-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 = UseOrConstantAtStart(instr->BetterRightOperand());
-    return DefineAsRegister(new(zone()) LBitI(left, right));
-  } else {
-    return DoArithmeticT(instr->op(), instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    if (instr->HasPowerOf2Divisor()) {
-      ASSERT(!instr->CheckFlag(HValue::kCanBeDivByZero));
-      LOperand* value = UseRegisterAtStart(instr->left());
-      LDivI* div = new(zone()) LDivI(value, UseConstant(instr->right()), NULL);
-      return AssignEnvironment(DefineAsRegister(div));
+  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));
     }
-    LOperand* dividend = UseRegister(instr->left());
-    LOperand* divisor = UseRegister(instr->right());
-    LOperand* temp = CpuFeatures::IsSupported(SUDIV) ? NULL : FixedTemp(d4);
-    LDivI* div = new(zone()) LDivI(dividend, divisor, temp);
-    return AssignEnvironment(DefineAsRegister(div));
-  } else if (instr->representation().IsDouble()) {
-    return DoArithmeticD(Token::DIV, instr);
-  } else {
-    return DoArithmeticT(Token::DIV, instr);
-  }
-}
-
-
-bool LChunkBuilder::HasMagicNumberForDivisor(int32_t divisor) {
-  uint32_t divisor_abs = abs(divisor);
-  // Dividing by 0, 1, and powers of 2 is easy.
-  // Note that IsPowerOf2(0) returns true;
-  ASSERT(IsPowerOf2(0) == true);
-  if (IsPowerOf2(divisor_abs)) return true;
-
-  // We have magic numbers for a few specific divisors.
-  // Details and proofs can be found in:
-  // - Hacker's Delight, Henry S. Warren, Jr.
-  // - The PowerPC Compiler Writer’s Guide
-  // and probably many others.
-  //
-  // We handle
-  //   <divisor with magic numbers> * <power of 2>
-  // but not
-  //   <divisor with magic numbers> * <other divisor with magic numbers>
-  int32_t power_of_2_factor =
-    CompilerIntrinsics::CountTrailingZeros(divisor_abs);
-  DivMagicNumbers magic_numbers =
-    DivMagicNumberFor(divisor_abs >> power_of_2_factor);
-  if (magic_numbers.M != InvalidDivMagicNumber.M) return true;
-
-  return false;
-}
-
-
-HValue* LChunkBuilder::SimplifiedDivisorForMathFloorOfDiv(HValue* divisor) {
-  if (CpuFeatures::IsSupported(SUDIV)) {
-    // A value with an integer representation does not need to be transformed.
-    if (divisor->representation().IsInteger32()) {
-      return divisor;
-    // A change from an integer32 can be replaced by the integer32 value.
-    } else if (divisor->IsChange() &&
-               HChange::cast(divisor)->from().IsInteger32()) {
-      return HChange::cast(divisor)->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;
     }
-  }
-
-  if (divisor->IsConstant() && HConstant::cast(divisor)->HasInteger32Value()) {
-    HConstant* constant_val = HConstant::cast(divisor);
-    int32_t int32_val = constant_val->Integer32Value();
-    if (LChunkBuilder::HasMagicNumberForDivisor(int32_val) ||
-        CpuFeatures::IsSupported(SUDIV)) {
-      return constant_val->CopyToRepresentation(Representation::Integer32(),
-                                                divisor->block()->zone());
+  } 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));
+      }
     }
-  }
-
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
-  HValue* right = instr->right();
-  LOperand* dividend = UseRegister(instr->left());
-  LOperand* divisor = CpuFeatures::IsSupported(SUDIV)
-      ? UseRegister(right)
-      : UseOrConstant(right);
-  LOperand* remainder = TempRegister();
-  ASSERT(CpuFeatures::IsSupported(SUDIV) ||
-         (right->IsConstant() &&
-          HConstant::cast(right)->HasInteger32Value() &&
-          HasMagicNumberForDivisor(HConstant::cast(right)->Integer32Value())));
-  return AssignEnvironment(DefineAsRegister(
-          new(zone()) LMathFloorOfDiv(dividend, divisor, remainder)));
-}
-
-
-LInstruction* LChunkBuilder::DoMod(HMod* instr) {
-  HValue* left = instr->left();
-  HValue* right = instr->right();
-  if (instr->representation().IsSmiOrInteger32()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    if (instr->HasPowerOf2Divisor()) {
-      ASSERT(!right->CanBeZero());
-      LModI* mod = new(zone()) LModI(UseRegisterAtStart(left),
-                                     UseConstant(right));
-      LInstruction* result = DefineAsRegister(mod);
-      return (left->CanBeNegative() &&
-              instr->CheckFlag(HValue::kBailoutOnMinusZero))
-          ? AssignEnvironment(result)
-          : result;
-    } else if (CpuFeatures::IsSupported(SUDIV)) {
-      LModI* mod = new(zone()) LModI(UseRegister(left),
-                                     UseRegister(right));
-      LInstruction* result = DefineAsRegister(mod);
-      return (right->CanBeZero() ||
-              (left->RangeCanInclude(kMinInt) &&
-               right->RangeCanInclude(-1) &&
-               instr->CheckFlag(HValue::kBailoutOnMinusZero)) ||
-              (left->CanBeNegative() &&
-               instr->CanBeZero() &&
-               instr->CheckFlag(HValue::kBailoutOnMinusZero)))
-          ? AssignEnvironment(result)
-          : result;
-    } else {
-      LModI* mod = new(zone()) LModI(UseRegister(left),
-                                     UseRegister(right),
-                                     FixedTemp(d10),
-                                     FixedTemp(d11));
-      LInstruction* result = DefineAsRegister(mod);
-      return (right->CanBeZero() ||
-              (left->CanBeNegative() &&
-               instr->CanBeZero() &&
-               instr->CheckFlag(HValue::kBailoutOnMinusZero)))
-          ? AssignEnvironment(result)
-          : result;
-    }
-  } 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()));
-    HValue* left = instr->BetterLeftOperand();
-    HValue* right = instr->BetterRightOperand();
-    LOperand* left_op;
-    LOperand* right_op;
-    bool can_overflow = instr->CheckFlag(HValue::kCanOverflow);
-    bool bailout_on_minus_zero = instr->CheckFlag(HValue::kBailoutOnMinusZero);
-
-    if (right->IsConstant()) {
-      HConstant* constant = HConstant::cast(right);
-      int32_t constant_value = constant->Integer32Value();
-      // Constants -1, 0 and 1 can be optimized if the result can overflow.
-      // For other constants, it can be optimized only without overflow.
-      if (!can_overflow || ((constant_value >= -1) && (constant_value <= 1))) {
-        left_op = UseRegisterAtStart(left);
-        right_op = UseConstant(right);
+  } 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 {
-        if (bailout_on_minus_zero) {
-          left_op = UseRegister(left);
-        } else {
-          left_op = UseRegisterAtStart(left);
-        }
-        right_op = UseRegister(right);
+        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());
+      if (instr->value()->CheckFlag(HInstruction::kUint32)) {
+        LUint32ToSmi* result = new(zone()) LUint32ToSmi(value);
+        return AssignEnvironment(DefineAsRegister(result));
+      } else {
+        // This cannot deoptimize because an A64 smi can represent any int32.
+        return DefineAsRegister(new(zone()) LInteger32ToSmi(value));
       }
     } else {
-      if (bailout_on_minus_zero) {
-        left_op = UseRegister(left);
+      ASSERT(to.IsDouble());
+      if (instr->value()->CheckFlag(HInstruction::kUint32)) {
+        return DefineAsRegister(
+            new(zone()) LUint32ToDouble(UseRegisterAtStart(instr->value())));
       } else {
-        left_op = UseRegisterAtStart(left);
-      }
-      right_op = UseRegister(right);
-    }
-    LMulI* mul = new(zone()) LMulI(left_op, right_op);
-    if (can_overflow || bailout_on_minus_zero) {
-      AssignEnvironment(mul);
-    }
-    return DefineAsRegister(mul);
-
-  } else if (instr->representation().IsDouble()) {
-    if (instr->UseCount() == 1 && (instr->uses().value()->IsAdd() ||
-                                   instr->uses().value()->IsSub())) {
-      HBinaryOperation* use = HBinaryOperation::cast(instr->uses().value());
-
-      if (use->IsAdd() && instr == use->left()) {
-        // This mul is the lhs of an add. The add and mul will be folded into a
-        // multiply-add in DoAdd.
-        return NULL;
-      }
-      if (instr == use->right() && use->IsAdd() && !use->left()->IsMul()) {
-        // This mul is the rhs of an add, where the lhs is not another mul.
-        // The add and mul will be folded into a multiply-add in DoAdd.
-        return NULL;
-      }
-      if (instr == use->right() && use->IsSub()) {
-        // This mul is the rhs of a sub. The sub and mul will be folded into a
-        // multiply-sub in DoSub.
-        return NULL;
+        return DefineAsRegister(
+            new(zone()) LInteger32ToDouble(UseRegisterAtStart(instr->value())));
       }
     }
-
-    return DoArithmeticD(Token::MUL, instr);
+  }
+
+  UNREACHABLE();
+  return NULL;
+}
+
+
+LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
+  // We only need a temp register if the target is in new space, but we can't
+  // dereference the handle to test that here.
+  // TODO(all): Check these constraints. The temp register is not always used.
+  LOperand* value = UseRegister(instr->value());
+  LOperand* temp = TempRegister();
+  return AssignEnvironment(new(zone()) LCheckValue(value, temp));
+}
+
+
+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 {
-    return DoArithmeticT(Token::MUL, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoSub(HSub* instr) {
-  if (instr->representation().IsSmiOrInteger32()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-
-    if (instr->left()->IsConstant()) {
-      // If lhs is constant, do reverse subtraction instead.
-      return DoRSub(instr);
+    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));
     }
-
-    LOperand* left = UseRegisterAtStart(instr->left());
-    LOperand* right = UseOrConstantAtStart(instr->right());
-    LSubI* sub = new(zone()) LSubI(left, right);
-    LInstruction* result = DefineAsRegister(sub);
-    if (instr->CheckFlag(HValue::kCanOverflow)) {
-      result = AssignEnvironment(result);
-    }
-    return result;
-  } else if (instr->representation().IsDouble()) {
-    if (instr->right()->IsMul()) {
-      return DoMultiplySub(instr->left(), HMul::cast(instr->right()));
-    }
-
-    return DoArithmeticD(Token::SUB, instr);
+  }
+}
+
+
+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 {
-    return DoArithmeticT(Token::SUB, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoRSub(HSub* instr) {
-  ASSERT(instr->representation().IsSmiOrInteger32());
-  ASSERT(instr->left()->representation().Equals(instr->representation()));
-  ASSERT(instr->right()->representation().Equals(instr->representation()));
-
-  // Note: The lhs of the subtraction becomes the rhs of the
-  // reverse-subtraction.
-  LOperand* left = UseRegisterAtStart(instr->right());
-  LOperand* right = UseOrConstantAtStart(instr->left());
-  LRSubI* rsb = new(zone()) LRSubI(left, right);
-  LInstruction* result = DefineAsRegister(rsb);
-  if (instr->CheckFlag(HValue::kCanOverflow)) {
-    result = AssignEnvironment(result);
-  }
-  return result;
-}
-
-
-LInstruction* LChunkBuilder::DoMultiplyAdd(HMul* mul, HValue* addend) {
-  LOperand* multiplier_op = UseRegisterAtStart(mul->left());
-  LOperand* multiplicand_op = UseRegisterAtStart(mul->right());
-  LOperand* addend_op = UseRegisterAtStart(addend);
-  return DefineSameAsFirst(new(zone()) LMultiplyAddD(addend_op, multiplier_op,
-                                                     multiplicand_op));
-}
-
-
-LInstruction* LChunkBuilder::DoMultiplySub(HValue* minuend, HMul* mul) {
-  LOperand* minuend_op = UseRegisterAtStart(minuend);
-  LOperand* multiplier_op = UseRegisterAtStart(mul->left());
-  LOperand* multiplicand_op = UseRegisterAtStart(mul->right());
-
-  return DefineSameAsFirst(new(zone()) LMultiplySubD(minuend_op,
-                                                     multiplier_op,
-                                                     multiplicand_op));
-}
-
-
-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 = UseOrConstantAtStart(instr->BetterRightOperand());
-    LAddI* add = new(zone()) LAddI(left, right);
-    LInstruction* result = DefineAsRegister(add);
-    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 = UseOrConstantAtStart(instr->right());
-    LAddI* add = new(zone()) LAddI(left, right);
-    LInstruction* result = DefineAsRegister(add);
-    return result;
-  } else if (instr->representation().IsDouble()) {
-    if (instr->left()->IsMul()) {
-      return DoMultiplyAdd(HMul::cast(instr->left()), instr->right());
-    }
-
-    if (instr->right()->IsMul()) {
-      ASSERT(!instr->left()->IsMul());
-      return DoMultiplyAdd(HMul::cast(instr->right()), instr->left());
-    }
-
-    return DoArithmeticD(Token::ADD, instr);
-  } else {
-    return DoArithmeticT(Token::ADD, 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 = UseOrConstantAtStart(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::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.IsDouble() ?
-      UseFixedDouble(instr->right(), d1) :
-      UseFixed(instr->right(), r2);
-  LPower* result = new(zone()) LPower(left, right);
-  return MarkAsCall(DefineFixedDouble(result, d2),
-                    instr,
-                    CAN_DEOPTIMIZE_EAGERLY);
-}
-
-
-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(), r1);
-  LOperand* right = UseFixed(instr->right(), r0);
-  LCmpT* result = new(zone()) LCmpT(context, left, right);
-  return MarkAsCall(DefineFixed(result, r0), instr);
+    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());
-    LOperand* left = UseRegisterAtStart(instr->left());
-    LOperand* right = UseRegisterAtStart(instr->right());
+    // 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::DoCompareHoleAndBranch(
-    HCompareHoleAndBranch* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return new(zone()) LCmpHoleAndBranch(value);
-}
-
-
+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::DoDiv(HDiv* instr) {
+  if (instr->representation().IsInteger32()) {
+    // TODO(all): Update this case to support smi inputs.
+    ASSERT(instr->left()->representation().Equals(instr->representation()));
+    ASSERT(instr->right()->representation().Equals(instr->representation()));
+    if (instr->RightIsPowerOf2()) {
+      ASSERT(!instr->CheckFlag(HValue::kCanBeDivByZero));
+      LOperand* value = UseRegister(instr->left());
+      LDivI* div = new(zone()) LDivI(value, UseConstant(instr->right()), NULL);
+      return AssignEnvironment(DefineAsRegister(div));
+    }
+    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));
+  } 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* temp = TempRegister();
-  return new(zone()) LIsObjectAndBranch(value, temp);
+  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(Use(instr->value()));
+  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::DoStringCompareAndBranch(
-    HStringCompareAndBranch* instr) {
-  ASSERT(instr->left()->representation().IsTagged());
-  ASSERT(instr->right()->representation().IsTagged());
+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* left = UseFixed(instr->left(), r1);
-  LOperand* right = UseFixed(instr->right(), r0);
-  LStringCompareAndBranch* result =
-      new(zone()) LStringCompareAndBranch(context, left, right);
+  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::DoHasInstanceTypeAndBranch(
-    HHasInstanceTypeAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return new(zone()) LHasInstanceTypeAndBranch(value);
-}
-
-
-LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
-    HGetCachedArrayIndex* instr)  {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegisterAtStart(instr->value());
-
-  return DefineAsRegister(new(zone()) LGetCachedArrayIndex(value));
-}
-
-
-LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
-    HHasCachedArrayIndexAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LHasCachedArrayIndexAndBranch(
-      UseRegisterAtStart(instr->value()));
-}
-
-
-LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
-    HClassOfTestAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* value = UseRegister(instr->value());
-  return new(zone()) LClassOfTestAndBranch(value, TempRegister());
+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::DoElementsKind(HElementsKind* instr) {
-  LOperand* object = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LElementsKind(object));
-}
-
-
-LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
-  LOperand* object = UseRegister(instr->value());
-  LValueOf* result = new(zone()) LValueOf(object, TempRegister());
-  return DefineAsRegister(result);
-}
-
-
-LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
-  LOperand* object = UseFixed(instr->value(), r0);
-  LDateField* result =
-      new(zone()) LDateField(object, FixedTemp(r1), instr->index());
-  return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
-}
-
-
-LInstruction* LChunkBuilder::DoSeqStringGetChar(HSeqStringGetChar* instr) {
-  LOperand* string = UseRegisterAtStart(instr->string());
-  LOperand* index = UseRegisterOrConstantAtStart(instr->index());
-  return DefineAsRegister(new(zone()) LSeqStringGetChar(string, index));
-}
-
-
-LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
-  LOperand* string = UseRegisterAtStart(instr->string());
-  LOperand* index = FLAG_debug_code
-      ? UseRegisterAtStart(instr->index())
-      : UseRegisterOrConstantAtStart(instr->index());
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LOperand* context = FLAG_debug_code ? UseFixed(instr->context(), cp) : NULL;
-  return new(zone()) LSeqStringSetChar(context, string, index, value);
-}
-
-
-LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
-  LOperand* value = UseRegisterOrConstantAtStart(instr->index());
-  LOperand* length = UseRegister(instr->length());
-  return AssignEnvironment(new(zone()) LBoundsCheck(value, length));
-}
-
-
-LInstruction* LChunkBuilder::DoBoundsCheckBaseIndexInformation(
-    HBoundsCheckBaseIndexInformation* instr) {
-  UNREACHABLE();
-  return NULL;
-}
-
-
-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::DoThrow(HThrow* instr) {
+LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
+  HValue* right = instr->right();
+  LOperand* dividend = UseRegister(instr->left());
+  LOperand* divisor = UseRegister(right);
+  LOperand* remainder = TempRegister();
+  return AssignEnvironment(DefineAsRegister(
+          new(zone()) LMathFloorOfDiv(dividend, divisor, remainder)));
+}
+
+
+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::DoMod(HMod* hmod) {
+  HValue* hleft = hmod->left();
+  HValue* hright = hmod->right();
+
+  // TODO(jbramley): Add smi support.
+  if (hmod->representation().IsInteger32()) {
+    ASSERT(hleft->representation().IsInteger32());
+    ASSERT(hleft->representation().IsInteger32());
+    LOperand* left_op;
+    LOperand* right_op;
+
+    if (hmod->RightIsPowerOf2()) {
+      left_op = UseRegisterAtStart(hleft);
+      right_op = UseConstant(hright);
+    } else {
+      right_op = UseRegister(hright);
+      left_op = UseRegister(hleft);
+    }
+
+    LModI* lmod = new(zone()) LModI(left_op, right_op);
+
+    if (hmod->right()->CanBeZero() ||
+        (hmod->CheckFlag(HValue::kBailoutOnMinusZero) &&
+         hmod->left()->CanBeNegative() && hmod->CanBeZero())) {
+      AssignEnvironment(lmod);
+    }
+    return DefineAsRegister(lmod);
+
+  } else if (hmod->representation().IsSmiOrTagged()) {
+    return DoArithmeticT(Token::MOD, hmod);
+  } else {
+    return DoArithmeticD(Token::MOD, hmod);
+  }
+}
+
+
+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()) {
+      // TODO(jbramley/rmcilroy): Fix LMulS so we can UseRegisterAtStart here.
+      LOperand* right = UseRegister(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);
-  LOperand* value = UseFixed(instr->value(), r0);
-  return MarkAsCall(new(zone()) LThrow(context, value), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoForceRepresentation(HForceRepresentation* bad) {
-  // All HForceRepresentation instructions should be eliminated in the
-  // representation change phase of Hydrogen.
-  UNREACHABLE();
-  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());
-      LNumberUntagD* res = new(zone()) LNumberUntagD(value);
-      return AssignEnvironment(DefineAsRegister(res));
-    } else if (to.IsSmi()) {
-      HValue* val = instr->value();
-      LOperand* value = UseRegister(val);
-      if (val->type().IsSmi()) {
-        return DefineSameAsFirst(new(zone()) LDummyUse(value));
-      }
-      return AssignEnvironment(DefineSameAsFirst(new(zone()) LCheckSmi(value)));
-    } else {
-      ASSERT(to.IsInteger32());
-      LOperand* value = NULL;
-      LInstruction* res = NULL;
-      HValue* val = instr->value();
-      if (val->type().IsSmi() || val->representation().IsSmi()) {
-        value = UseRegisterAtStart(val);
-        res = DefineAsRegister(new(zone()) LSmiUntag(value, false));
-      } else {
-        value = UseRegister(val);
-        LOperand* temp1 = TempRegister();
-        LOperand* temp2 = FixedTemp(d11);
-        res = DefineSameAsFirst(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();
-
-      // Make sure that the temp and result_temp registers are
-      // different.
-      LUnallocated* result_temp = TempRegister();
-      LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
-      Define(result, result_temp);
-      return AssignPointerMap(result);
-    } else if (to.IsSmi()) {
-      LOperand* value = UseRegister(instr->value());
-      return AssignEnvironment(
-          DefineAsRegister(new(zone()) LDoubleToSmi(value)));
-    } else {
-      ASSERT(to.IsInteger32());
-      LOperand* value = UseRegister(instr->value());
-      LDoubleToI* res = new(zone()) LDoubleToI(value);
-      return AssignEnvironment(DefineAsRegister(res));
-    }
-  } else if (from.IsInteger32()) {
-    info()->MarkAsDeferredCalling();
-    if (to.IsTagged()) {
-      HValue* val = instr->value();
-      LOperand* value = UseRegisterAtStart(val);
-      if (val->CheckFlag(HInstruction::kUint32)) {
-        LNumberTagU* result = new(zone()) LNumberTagU(value);
-        return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-      } else if (val->HasRange() && val->range()->IsInSmiRange()) {
-        return DefineAsRegister(new(zone()) LSmiTag(value));
-      } else {
-        LNumberTagI* result = new(zone()) LNumberTagI(value);
-        return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-      }
-    } else if (to.IsSmi()) {
-      HValue* val = instr->value();
-      LOperand* value = UseRegister(val);
-      LInstruction* result = val->CheckFlag(HInstruction::kUint32)
-          ? DefineAsRegister(new(zone()) LUint32ToSmi(value))
-          : DefineAsRegister(new(zone()) LInteger32ToSmi(value));
-      if (val->HasRange() && val->range()->IsInSmiRange()) {
-        return result;
-      }
-      return AssignEnvironment(result);
-    } else {
-      ASSERT(to.IsDouble());
-      if (instr->value()->CheckFlag(HInstruction::kUint32)) {
-        return DefineAsRegister(
-            new(zone()) LUint32ToDouble(UseRegister(instr->value())));
-      } else {
-        return DefineAsRegister(
-            new(zone()) LInteger32ToDouble(Use(instr->value())));
-      }
-    }
-  }
-  UNREACHABLE();
-  return NULL;
-}
-
-
-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::DoCheckInstanceType(HCheckInstanceType* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LInstruction* result = new(zone()) LCheckInstanceType(value);
-  return AssignEnvironment(result);
-}
-
-
-LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckValue(value));
-}
-
-
-LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
-  LOperand* value = NULL;
-  if (!instr->CanOmitMapChecks()) {
-    value = UseRegisterAtStart(instr->value());
-    if (instr->has_migration_target()) info()->MarkAsDeferredCalling();
-  }
-  LCheckMaps* result = new(zone()) LCheckMaps(value);
-  if (!instr->CanOmitMapChecks()) {
-    AssignEnvironment(result);
-    if (instr->has_migration_target()) return AssignPointerMap(result);
-  }
-  return result;
-}
-
-
-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());
-    // Register allocator doesn't (yet) support allocation of double
-    // temps. Reserve d1 explicitly.
-    LClampTToUint8* result = new(zone()) LClampTToUint8(reg, FixedTemp(d11));
-    return AssignEnvironment(DefineAsRegister(result));
-  }
-}
-
-
+  return MarkAsCall(
+      DefineFixed(new(zone()) LRegExpLiteral(context), x0), instr);
+}
+
+
 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(), r0), context,
+  return new(zone()) LReturn(UseFixed(instr->value(), x0), context,
                              parameter_count);
 }
 
 
-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::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(), r0);
-  LLoadGlobalGeneric* result =
-      new(zone()) LLoadGlobalGeneric(context, global_object);
-  return MarkAsCall(DefineFixed(result, r0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoStoreGlobalCell(HStoreGlobalCell* instr) {
+LInstruction* LChunkBuilder::DoSeqStringGetChar(HSeqStringGetChar* instr) {
+  // TODO(all): Use UseRegisterAtStart and UseRegisterOrConstantAtStart here.
+  // We cannot do it now because the debug code in the implementation changes
+  // temp.
+  LOperand* string = UseRegister(instr->string());
+  LOperand* index = UseRegisterOrConstant(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());
-  // Use a temp to check the value in the cell in the case where we perform
-  // a hole check.
-  return instr->RequiresHoleCheck()
-      ? AssignEnvironment(new(zone()) LStoreGlobalCell(value, TempRegister()))
-      : new(zone()) LStoreGlobalCell(value, NULL);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
-  LOperand* context = UseRegisterAtStart(instr->value());
-  LInstruction* result =
-      DefineAsRegister(new(zone()) LLoadContextSlot(context));
-  return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
+  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());
+
+  // If there is an instruction pending deoptimization environment create a
+  // lazy bailout instruction to capture the environment.
+  if (pending_deoptimization_ast_id_ == instr->ast_id()) {
+    LInstruction* result = new(zone()) LLazyBailout;
+    result = AssignEnvironment(result);
+    // Store the lazy deopt environment with the instruction if needed. Right
+    // now it is only used for LInstanceOfKnownGlobal.
+    instruction_pending_deoptimization_environment_->
+        SetDeferredLazyDeoptimizationEnvironment(result->environment());
+    instruction_pending_deoptimization_environment_ = NULL;
+    pending_deoptimization_ast_id_ = BailoutId::None();
+    return result;
+  }
+
+  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()) {
-    context = UseTempRegister(instr->context());
-    value = UseTempRegister(instr->value());
+    // 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);
+  LInstruction* result = new(zone()) LStoreContextSlot(context, value, temp);
   return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
 }
 
 
-LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
-  LOperand* obj = UseRegisterAtStart(instr->object());
-  return DefineAsRegister(new(zone()) LLoadNamedField(obj));
-}
-
-
-LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseFixed(instr->object(), r0);
-  LInstruction* result =
-      DefineFixed(new(zone()) LLoadNamedGeneric(context, object), r0);
-  return MarkAsCall(result, instr);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
-    HLoadFunctionPrototype* instr) {
-  return AssignEnvironment(DefineAsRegister(
-      new(zone()) LLoadFunctionPrototype(UseRegister(instr->function()))));
-}
-
-
-LInstruction* LChunkBuilder::DoLoadRoot(HLoadRoot* instr) {
-  return DefineAsRegister(new(zone()) LLoadRoot);
-}
-
-
-LInstruction* LChunkBuilder::DoLoadExternalArrayPointer(
-    HLoadExternalArrayPointer* instr) {
-  LOperand* input = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LLoadExternalArrayPointer(input));
-}
-
-
-LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
-  ASSERT(instr->key()->representation().IsSmiOrInteger32());
-  ElementsKind elements_kind = instr->elements_kind();
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
-  LLoadKeyed* result = NULL;
-
-  if (!instr->is_typed_elements()) {
-    LOperand* obj = NULL;
-    if (instr->representation().IsDouble()) {
-      obj = UseRegister(instr->elements());
-    } else {
-      ASSERT(instr->representation().IsSmiOrTagged());
-      obj = UseRegisterAtStart(instr->elements());
-    }
-    result = new(zone()) LLoadKeyed(obj, key);
-  } else {
-    ASSERT(
-        (instr->representation().IsInteger32() &&
-         !IsDoubleOrFloatElementsKind(instr->elements_kind())) ||
-        (instr->representation().IsDouble() &&
-         IsDoubleOrFloatElementsKind(instr->elements_kind())));
-    LOperand* backing_store = UseRegister(instr->elements());
-    result = new(zone()) LLoadKeyed(backing_store, key);
-  }
-
-  DefineAsRegister(result);
-  // An unsigned int array load might overflow and cause a deopt, make sure it
-  // has an environment.
-  bool can_deoptimize = instr->RequiresHoleCheck() ||
-      elements_kind == EXTERNAL_UNSIGNED_INT_ELEMENTS ||
-      elements_kind == UINT32_ELEMENTS;
-  return can_deoptimize ? AssignEnvironment(result) : result;
-}
-
-
-LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseFixed(instr->object(), r1);
-  LOperand* key = UseFixed(instr->key(), r0);
-
-  LInstruction* result =
-      DefineFixed(new(zone()) LLoadKeyedGeneric(context, object, key), r0);
-  return MarkAsCall(result, instr);
+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) {
-  if (!instr->is_typed_elements()) {
+  LOperand* temp = NULL;
+  LOperand* elements = NULL;
+  LOperand* val = NULL;
+  LOperand* key = NULL;
+
+  if (!instr->is_typed_elements() &&
+      instr->value()->representation().IsTagged() &&
+      instr->NeedsWriteBarrier()) {
+    // RecordWrite() will clobber all registers.
+    elements = UseRegisterAndClobber(instr->elements());
+    val = UseRegisterAndClobber(instr->value());
+    key = UseRegisterAndClobber(instr->key());
+  } else {
+    elements = UseRegister(instr->elements());
+    val = UseRegister(instr->value());
+    key = UseRegisterOrConstantAtStart(instr->key());
+  }
+
+  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()));
+    temp = instr->key()->IsConstant() ? NULL : TempRegister();
+    return new(zone()) LStoreKeyedExternal(elements, key, val, temp);
+
+  } else if (instr->value()->representation().IsDouble()) {
     ASSERT(instr->elements()->representation().IsTagged());
-    bool needs_write_barrier = instr->NeedsWriteBarrier();
-    LOperand* object = NULL;
-    LOperand* key = NULL;
-    LOperand* val = NULL;
-
-    if (instr->value()->representation().IsDouble()) {
-      object = UseRegisterAtStart(instr->elements());
-      val = UseRegister(instr->value());
-      key = UseRegisterOrConstantAtStart(instr->key());
-    } else {
-      ASSERT(instr->value()->representation().IsSmiOrTagged());
-      if (needs_write_barrier) {
-        object = UseTempRegister(instr->elements());
-        val = UseTempRegister(instr->value());
-        key = UseTempRegister(instr->key());
-      } else {
-        object = UseRegisterAtStart(instr->elements());
-        val = UseRegisterAtStart(instr->value());
-        key = UseRegisterOrConstantAtStart(instr->key());
-      }
-    }
-
-    return new(zone()) LStoreKeyed(object, key, val);
-  }
-
-  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()));
-  LOperand* val = UseRegister(instr->value());
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
-  LOperand* backing_store = UseRegister(instr->elements());
-  return new(zone()) LStoreKeyed(backing_store, key, val);
+
+    // The constraint used here is UseRegister, even though the StoreKeyed
+    // instruction may canonicalize the value in the register if it is a NaN.
+    temp = TempRegister();
+    return new(zone()) LStoreKeyedFixedDouble(elements, key, val, temp);
+
+  } else {
+    ASSERT(instr->elements()->representation().IsTagged());
+    ASSERT(instr->value()->representation().IsSmiOrTagged() ||
+           instr->value()->representation().IsInteger32());
+
+    temp = TempRegister();
+    return new(zone()) LStoreKeyedFixed(elements, key, val, temp);
+  }
 }
 
 
 LInstruction* LChunkBuilder::DoStoreKeyedGeneric(HStoreKeyedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* obj = UseFixed(instr->object(), r2);
-  LOperand* key = UseFixed(instr->key(), r1);
-  LOperand* val = UseFixed(instr->value(), r0);
+  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, obj, key, val), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoTransitionElementsKind(
-    HTransitionElementsKind* instr) {
+      new(zone()) LStoreKeyedGeneric(context, object, key, value), instr);
+}
+
+
+LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
+  // TODO(jbramley): Optimize register usage in this instruction. For now, it
+  // allocates everything that it might need because it keeps changing in the
+  // merge and keeping it valid is time-consuming.
+
+  // 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());
-  if (IsSimpleMapChangeTransition(instr->from_kind(), instr->to_kind())) {
-    LOperand* new_map_reg = TempRegister();
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, NULL, new_map_reg);
-    return result;
-  } else {
-    LOperand* context = UseFixed(instr->context(), cp);
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, context, NULL);
-    return AssignPointerMap(result);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoTrapAllocationMemento(
-    HTrapAllocationMemento* instr) {
-  LOperand* object = UseRegister(instr->object());
-  LOperand* temp = TempRegister();
-  LTrapAllocationMemento* result =
-      new(zone()) LTrapAllocationMemento(object, temp);
-  return AssignEnvironment(result);
-}
-
-
-LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
-  bool is_in_object = instr->access().IsInobject();
-  bool needs_write_barrier = instr->NeedsWriteBarrier();
-  bool needs_write_barrier_for_map = instr->has_transition() &&
-      instr->NeedsWriteBarrierForMap();
-
-  LOperand* obj;
-  if (needs_write_barrier) {
-    obj = is_in_object
-        ? UseRegister(instr->object())
-        : UseTempRegister(instr->object());
-  } else {
-    obj = needs_write_barrier_for_map
-        ? UseRegister(instr->object())
-        : UseRegisterAtStart(instr->object());
-  }
-
-  LOperand* val;
-  if (needs_write_barrier ||
-      (FLAG_track_fields && instr->field_representation().IsSmi())) {
-    val = UseTempRegister(instr->value());
-  } else if (FLAG_track_double_fields &&
-             instr->field_representation().IsDouble()) {
-    val = UseRegisterAtStart(instr->value());
-  } else {
-    val = UseRegister(instr->value());
-  }
-
-  // We need a temporary register for write barrier of the map field.
-  LOperand* temp = needs_write_barrier_for_map ? TempRegister() : NULL;
-
-  LStoreNamedField* result = new(zone()) LStoreNamedField(obj, val, temp);
+  LOperand* value = UseRegisterAndClobber(instr->value());
+  LOperand* temp0 = TempRegister();
+  LOperand* temp1 = TempRegister();
+
+  LStoreNamedField* result =
+      new(zone()) LStoreNamedField(object, value, temp0, temp1);
   if (FLAG_track_heap_object_fields &&
-      instr->field_representation().IsHeapObject()) {
-    if (!instr->value()->type().IsHeapObject()) {
-      return AssignEnvironment(result);
-    }
+      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* obj = UseFixed(instr->object(), r1);
-  LOperand* val = UseFixed(instr->value(), r0);
-
-  LInstruction* result = new(zone()) LStoreNamedGeneric(context, obj, val);
+  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 = FLAG_new_string_add
-      ? UseFixed(instr->left(), r1)
-      : UseRegisterAtStart(instr->left());
-  LOperand* right = FLAG_new_string_add
-      ? UseFixed(instr->right(), r0)
-      : UseRegisterAtStart(instr->right());
-  return MarkAsCall(
-      DefineFixed(new(zone()) LStringAdd(context, left, right), r0),
-      instr);
+  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 = UseTempRegister(instr->string());
-  LOperand* index = UseTempRegister(instr->index());
+  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) {
+  // TODO(all) use at start and remove assert in codegen
   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::DoAllocate(HAllocate* instr) {
-  info()->MarkAsDeferredCalling();
-  LOperand* context = UseAny(instr->context());
-  LOperand* size = instr->size()->IsConstant()
-      ? UseConstant(instr->size())
-      : UseTempRegister(instr->size());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LAllocate* result = new(zone()) LAllocate(context, size, temp1, temp2);
-  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::DoRegExpLiteral(HRegExpLiteral* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(
-      DefineFixed(new(zone()) LRegExpLiteral(context), r0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoFunctionLiteral(HFunctionLiteral* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(
-      DefineFixed(new(zone()) LFunctionLiteral(context), r0), 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);
+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 {
-    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);
+    return DoArithmeticT(Token::SUB, instr);
   }
 }
 
 
-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);
+LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
+  if (instr->HasNoUses()) {
+    return NULL;
   } else {
-    spill_index = env_index - instr->environment()->first_local_index();
-    if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
-      Abort(kTooManySpillSlotsNeededForOSR);
-      spill_index = 0;
-    }
+    return DefineAsRegister(new(zone()) LThisFunction);
   }
-  return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
-}
-
-
-LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(DefineFixed(new(zone()) LCallStub(context), r0), instr);
-}
-
-
-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::DoCapturedObject(HCapturedObject* instr) {
-  instr->ReplayEnvironment(current_block_->last_environment());
-
-  // There are no real uses of a captured object.
-  return NULL;
-}
-
-
-LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
-  info()->MarkAsRequiresFrame();
-  LOperand* args = UseRegister(instr->arguments());
-  LOperand* length = UseRegisterOrConstantAtStart(instr->length());
-  LOperand* index = UseRegisterOrConstantAtStart(instr->index());
-  return DefineAsRegister(new(zone()) LAccessArgumentsAt(args, length, index));
 }
 
 
 LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
-  LOperand* object = UseFixed(instr->value(), r0);
+  LOperand* object = UseFixed(instr->value(), x0);
   LToFastProperties* result = new(zone()) LToFastProperties(object);
-  return MarkAsCall(DefineFixed(result, r0), instr);
+  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);
-  LTypeof* result = new(zone()) LTypeof(context, UseFixed(instr->value(), r0));
-  return MarkAsCall(DefineFixed(result, r0), instr);
+  // 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;
 
-  return new(zone()) LTypeofIsAndBranch(UseRegister(instr->value()));
+  // 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::DoIsConstructCallAndBranch(
-    HIsConstructCallAndBranch* instr) {
-  return new(zone()) LIsConstructCallAndBranch(TempRegister());
-}
-
-
-LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
-  instr->ReplayEnvironment(current_block_->last_environment());
-
-  // If there is an instruction pending deoptimization environment create a
-  // lazy bailout instruction to capture the environment.
-  if (pending_deoptimization_ast_id_ == instr->ast_id()) {
-    LInstruction* result = new(zone()) LLazyBailout;
-    result = AssignEnvironment(result);
-    // Store the lazy deopt environment with the instruction if needed. Right
-    // now it is only used for LInstanceOfKnownGlobal.
-    instruction_pending_deoptimization_environment_->
-        SetDeferredLazyDeoptimizationEnvironment(result->environment());
-    instruction_pending_deoptimization_environment_ = NULL;
-    pending_deoptimization_ast_id_ = BailoutId::None();
-    return result;
-  }
-
-  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::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::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());
+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;
+    }
   }
-  inner->set_entry(instr);
-  current_block_->UpdateEnvironment(inner);
-  chunk_->AddInlinedClosure(instr->closure());
-  return NULL;
+  return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
 }
 
 
-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::DoUseConst(HUseConst* instr) {
+  return NULL;
 }
 
 
 LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
-  LOperand* object = UseFixed(instr->enumerable(), r0);
+  // 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, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
+  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 = UseRegisterAtStart(instr->map());
-  return AssignEnvironment(new(zone()) LCheckMapValue(value, map));
+  LOperand* map = UseRegister(instr->map());
+  LOperand* temp = TempRegister();
+  return AssignEnvironment(new(zone()) LCheckMapValue(value, map, temp));
 }
 
 
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
-  LOperand* object = UseRegister(instr->object());
+  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