A64: add missing files.

src/a64/lithium-a64.cc

Index: src/a64/lithium-a64.cc
diff --git a/src/mips/lithium-mips.cc b/src/a64/lithium-a64.cc
similarity index 62%
copy from src/mips/lithium-mips.cc
copy to src/a64/lithium-a64.cc
index ad39c618eaf7a504c35b53176717b0f7aa30d8db..4fa9712c2a87309bf1b05860879e7e406400bb69 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/a64/lithium-a64.cc
@@ -1,4 +1,4 @@
-// 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:
@@ -28,12 +28,13 @@
 #include "v8.h"
 
 #include "lithium-allocator-inl.h"
-#include "mips/lithium-mips.h"
-#include "mips/lithium-codegen-mips.h"
+#include "a64/lithium-a64.h"
+#include "a64/lithium-codegen-a64.h"
 
 namespace v8 {
 namespace internal {
 
+
 #define DEFINE_COMPILE(type)                            \
   void L##type::CompileToNative(LCodeGen* generator) {  \
     generator->Do##type(this);                          \
@@ -41,51 +42,116 @@ namespace internal {
 LITHIUM_CONCRETE_INSTRUCTION_LIST(DEFINE_COMPILE)
 #undef DEFINE_COMPILE
 
-LOsrEntry::LOsrEntry() {
-  for (int i = 0; i < Register::NumAllocatableRegisters(); ++i) {
-    register_spills_[i] = NULL;
-  }
-  for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); ++i) {
-    double_register_spills_[i] = NULL;
+
+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 LOsrEntry::MarkSpilledRegister(int allocation_index,
-                                    LOperand* spill_operand) {
-  ASSERT(spill_operand->IsStackSlot());
-  ASSERT(register_spills_[allocation_index] == NULL);
-  register_spills_[allocation_index] = spill_operand;
+void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
+  arguments()->PrintTo(stream);
+  stream->Add(" length ");
+  length()->PrintTo(stream);
+  stream->Add(" index ");
+  index()->PrintTo(stream);
 }
 
 
-#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());
-  }
+void LBranch::PrintDataTo(StringStream* stream) {
+  stream->Add("B%d | B%d on ", true_block_id(), false_block_id());
+  value()->PrintTo(stream);
+}
+
+
+void LCallConstantFunction::PrintDataTo(StringStream* stream) {
+  stream->Add("#%d / ", arity());
+}
+
+
+void LCallNamed::PrintDataTo(StringStream* stream) {
+  SmartArrayPointer<char> name_string = name()->ToCString();
+  stream->Add("%s #%d / ", *name_string, arity());
+}
+
+
+void LCallKeyed::PrintDataTo(StringStream* stream) {
+  stream->Add("[x2] #%d / ", arity());
+}
+
+
+void LCallKnownGlobal::PrintDataTo(StringStream* stream) {
+  stream->Add("#%d / ", arity());
+}
+
+
+void LCallGlobal::PrintDataTo(StringStream* stream) {
+  SmartArrayPointer<char> name_string = name()->ToCString();
+  stream->Add("%s #%d / ", *name_string, 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());
+  ASSERT(hydrogen()->property_cell()->value()->IsSmi());
+  ElementsKind kind = static_cast<ElementsKind>(
+      Smi::cast(hydrogen()->property_cell()->value())->value());
+  stream->Add(" (%s) ", ElementsKindToString(kind));
 }
-#endif
 
 
-void LOsrEntry::MarkSpilledDoubleRegister(int allocation_index,
-                                          LOperand* spill_operand) {
-  ASSERT(spill_operand->IsDoubleStackSlot());
-  ASSERT(double_register_spills_[allocation_index] == NULL);
-  double_register_spills_[allocation_index] = spill_operand;
+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 LCmpIDAndBranch::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());
+}
+
+
+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(" + %d", offset());
+}
+
+
+void LInvokeFunction::PrintDataTo(StringStream* stream) {
+  stream->Add("= ");
+  function()->PrintTo(stream);
+  stream->Add(" #%d / ", arity());
 }
 
 
@@ -126,18 +192,53 @@ void LInstruction::PrintOutputOperandTo(StringStream* 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(),
+              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;
     }
   }
@@ -157,6 +258,57 @@ void LGap::PrintDataTo(StringStream* stream) {
 }
 
 
+void LLoadContextSlot::PrintDataTo(StringStream* stream) {
+  context()->PrintTo(stream);
+  stream->Add("[%d]", slot_index());
+}
+
+
+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());
+  stream->Add(" <- ");
+  value()->PrintTo(stream);
+}
+
+
+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";
@@ -182,9 +334,9 @@ const char* LArithmeticT::Mnemonic() const {
     case Token::BIT_OR: return "bit-or-t";
     case Token::BIT_XOR: return "bit-xor-t";
     case Token::ROR: return "ror-t";
-    case Token::SHL: return "sll-t";
-    case Token::SAR: return "sra-t";
-    case Token::SHR: return "srl-t";
+    case Token::SHL: return "shl-t";
+    case Token::SAR: return "sar-t";
+    case Token::SHR: return "shr-t";
     default:
       UNREACHABLE();
       return NULL;
@@ -192,386 +344,81 @@ const char* LArithmeticT::Mnemonic() const {
 }
 
 
-bool LGoto::HasInterestingComment(LCodeGen* gen) const {
-  return !gen->IsNextEmittedBlock(block_id());
+void LChunkBuilder::Abort(const char* 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));
 }
 
 
-LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* instr) {
-  return new(zone()) LDebugBreak();
+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 LCmpIDAndBranch::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::UseFixed(HValue* value, Register fixed_register) {
+  return Use(value, ToUnallocated(fixed_register));
 }
 
 
-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::UseFixedDouble(HValue* value,
+                                        DoubleRegister 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::UseRegister(HValue* value) {
+  return Use(value, new(zone()) LUnallocated(LUnallocated::MUST_HAVE_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::UseRegisterAndClobber(HValue* value) {
+  return Use(value, new(zone()) LUnallocated(LUnallocated::WRITABLE_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());
-}
-
-
-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 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 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());
-}
-
-
-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 LTypeofIsAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if typeof ");
-  value()->PrintTo(stream);
-  stream->Add(" == \"%s\" then B%d else B%d",
-              *hydrogen()->type_literal()->ToCString(),
-              true_block_id(), false_block_id());
-}
-
-
-void LInnerAllocatedObject::PrintDataTo(StringStream* stream) {
-  stream->Add(" = ");
-  base_object()->PrintTo(stream);
-  stream->Add(" + %d", offset());
-}
-
-
-void LCallConstantFunction::PrintDataTo(StringStream* stream) {
-  stream->Add("#%d / ", arity());
-}
-
-
-void LLoadContextSlot::PrintDataTo(StringStream* stream) {
-  context()->PrintTo(stream);
-  stream->Add("[%d]", slot_index());
-}
-
-
-void LStoreContextSlot::PrintDataTo(StringStream* stream) {
-  context()->PrintTo(stream);
-  stream->Add("[%d] <- ", slot_index());
-  value()->PrintTo(stream);
-}
-
-
-void LInvokeFunction::PrintDataTo(StringStream* stream) {
-  stream->Add("= ");
-  function()->PrintTo(stream);
-  stream->Add(" #%d / ", arity());
-}
-
-
-void LCallKeyed::PrintDataTo(StringStream* stream) {
-  stream->Add("[a2] #%d / ", arity());
-}
-
-
-void LCallNamed::PrintDataTo(StringStream* stream) {
-  SmartArrayPointer<char> name_string = name()->ToCString();
-  stream->Add("%s #%d / ", *name_string, arity());
-}
-
-
-void LCallGlobal::PrintDataTo(StringStream* stream) {
-  SmartArrayPointer<char> name_string = name()->ToCString();
-  stream->Add("%s #%d / ", *name_string, arity());
-}
-
-
-void LCallKnownGlobal::PrintDataTo(StringStream* stream) {
-  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());
-  ASSERT(hydrogen()->property_cell()->value()->IsSmi());
-  ElementsKind kind = static_cast<ElementsKind>(
-      Smi::cast(hydrogen()->property_cell()->value())->value());
-  stream->Add(" (%s) ", ElementsKindToString(kind));
-}
-
-
-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());
-  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(bool is_double) {
-  // Skip a slot if for a double-width slot.
-  if (is_double) spill_slot_count_++;
-  return spill_slot_count_++;
-}
-
-
-LOperand* LPlatformChunk::GetNextSpillSlot(bool is_double)  {
-  int index = GetNextSpillIndex(is_double);
-  if (is_double) {
-    return LDoubleStackSlot::Create(index, zone());
-  } else {
-    return LStackSlot::Create(index, zone());
-  }
-}
-
-
-LPlatformChunk* LChunkBuilder::Build() {
-  ASSERT(is_unused());
-  chunk_ = new(zone()) LPlatformChunk(info(), graph());
-  HPhase phase("L_Building chunk", chunk_);
-  status_ = BUILDING;
-  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);
-    if (is_aborted()) return NULL;
-  }
-  status_ = DONE;
-  return chunk_;
-}
-
-
-void LCodeGen::Abort(const char* 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::UseRegisterAtStart(HValue* value) {
+  return Use(value,
+             new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER,
+                                      LUnallocated::USED_AT_START));
 }
 
 
 LOperand* LChunkBuilder::UseRegisterOrConstant(HValue* value) {
-  return value->IsConstant()
-      ? chunk_->DefineConstantOperand(HConstant::cast(value))
-      : UseRegister(value);
+  return value->IsConstant() ? UseConstant(value) : UseRegister(value);
 }
 
 
 LOperand* LChunkBuilder::UseRegisterOrConstantAtStart(HValue* value) {
-  return value->IsConstant()
-      ? chunk_->DefineConstantOperand(HConstant::cast(value))
-      : UseRegisterAtStart(value);
+  return value->IsConstant() ? UseConstant(value) : UseRegisterAtStart(value);
 }
 
 
-LOperand* LChunkBuilder::UseConstant(HValue* value) {
+LConstantOperand* 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;
+      ? UseConstant(value)
+      : Use(value, new(zone()) LUnallocated(LUnallocated::ANY));
 }
 
 
@@ -622,22 +469,11 @@ LInstruction* LChunkBuilder::DefineFixedDouble(
 }
 
 
-LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
-  HEnvironment* hydrogen_env = current_block_->last_environment();
-  int argument_index_accumulator = 0;
-  instr->set_environment(CreateEnvironment(hydrogen_env,
-                                           &argument_index_accumulator));
-  return instr;
-}
-
-
 LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
                                         HInstruction* hinstr,
                                         CanDeoptimize can_deoptimize) {
   info()->MarkAsNonDeferredCalling();
-#ifdef DEBUG
-  instr->VerifyCall();
-#endif
+  // TODO(all): Verify call in debug mode.
   instr->MarkAsCall();
   instr = AssignPointerMap(instr);
 
@@ -685,132 +521,47 @@ LUnallocated* LChunkBuilder::TempRegister() {
 }
 
 
-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::DoSoftDeoptimize(HSoftDeoptimize* instr) {
-  return AssignEnvironment(new(zone()) LDeoptimize);
-}
-
-
-LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
-  return AssignEnvironment(new(zone()) LDeoptimize);
+int LPlatformChunk::GetNextSpillIndex() {
+  return spill_slot_count_++;
 }
 
 
-LInstruction* LChunkBuilder::DoShift(Token::Value op,
-                                     HBitwiseBinaryOperation* instr) {
-  if (instr->representation().IsSmiOrTagged()) {
-    ASSERT(instr->left()->representation().IsSmiOrTagged());
-    ASSERT(instr->right()->representation().IsSmiOrTagged());
-
-    LOperand* left = UseFixed(instr->left(), a1);
-    LOperand* right = UseFixed(instr->right(), a0);
-    LArithmeticT* result = new(zone()) LArithmeticT(op, left, right);
-    return MarkAsCall(DefineFixed(result, v0), instr);
-  }
-
-  ASSERT(instr->representation().IsInteger32());
-  ASSERT(instr->left()->representation().IsInteger32());
-  ASSERT(instr->right()->representation().IsInteger32());
-  LOperand* left = UseRegisterAtStart(instr->left());
-
-  HValue* right_value = instr->right();
-  LOperand* right = NULL;
-  int constant_value = 0;
-  if (right_value->IsConstant()) {
-    HConstant* constant = HConstant::cast(right_value);
-    right = chunk_->DefineConstantOperand(constant);
-    constant_value = constant->Integer32Value() & 0x1f;
+LOperand* LPlatformChunk::GetNextSpillSlot(bool is_double) {
+  int index = GetNextSpillIndex();
+  if (is_double) {
+    return LDoubleStackSlot::Create(index, zone());
   } 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.
-  bool does_deopt = false;
-  if (op == Token::SHR && constant_value == 0) {
-    if (FLAG_opt_safe_uint32_operations) {
-      does_deopt = !instr->CheckFlag(HInstruction::kUint32);
-    } else {
-      for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
-        if (!it.value()->CheckFlag(HValue::kTruncatingToInt32)) {
-          does_deopt = true;
-          break;
-        }
-      }
-    }
+    return LStackSlot::Create(index, zone());
   }
-
-  LInstruction* result =
-      DefineAsRegister(new(zone()) LShiftI(op, left, right, does_deopt));
-  return does_deopt ? AssignEnvironment(result) : result;
 }
 
 
-LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
-                                           HArithmeticBinaryOperation* instr) {
-  ASSERT(instr->representation().IsDouble());
-  ASSERT(instr->left()->representation().IsDouble());
-  ASSERT(instr->right()->representation().IsDouble());
-  ASSERT(op != Token::MOD);
-  LOperand* left = UseRegisterAtStart(instr->left());
-  LOperand* right = UseRegisterAtStart(instr->right());
-  LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
-  return DefineAsRegister(result);
+LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
+  LUnallocated* operand = ToUnallocated(reg);
+  ASSERT(operand->HasFixedPolicy());
+  return operand;
 }
 
 
-LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
-                                           HArithmeticBinaryOperation* instr) {
-  ASSERT(op == Token::ADD ||
-         op == Token::DIV ||
-         op == Token::MOD ||
-         op == Token::MUL ||
-         op == Token::SUB);
-  HValue* left = instr->left();
-  HValue* right = instr->right();
-  ASSERT(left->representation().IsSmiOrTagged());
-  ASSERT(right->representation().IsSmiOrTagged());
-  LOperand* left_operand = UseFixed(left, a1);
-  LOperand* right_operand = UseFixed(right, a0);
-  LArithmeticT* result =
-      new(zone()) LArithmeticT(op, left_operand, right_operand);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LPlatformChunk* LChunkBuilder::Build() {
+  ASSERT(is_unused());
+  chunk_ = new(zone_) LPlatformChunk(info_, graph_);
+  HPhase phase("L_Building chunk", chunk_);
+  status_ = BUILDING;
+  const ZoneList<HBasicBlock*>* blocks = graph_->blocks();
+  for (int i = 0; i < blocks->length(); i++) {
+    DoBasicBlock(blocks->at(i));
+    if (is_aborted()) return NULL;
+  }
+  status_ = DONE;
+  return chunk_;
 }
 
 
-void LChunkBuilder::DoBasicBlock(HBasicBlock* block, 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;
@@ -821,12 +572,13 @@ void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
     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();
       }
     }
@@ -854,9 +606,11 @@ void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
     // 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);
@@ -869,7 +623,6 @@ void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
     block->set_last_instruction_index(end);
   }
   block->set_argument_count(argument_count_);
-  next_block_ = NULL;
   current_block_ = NULL;
 }
 
@@ -887,7 +640,7 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
     // 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.
@@ -910,12 +663,8 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
     }
 #endif
 
-    if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
-      instr = AssignPointerMap(instr);
-    }
-    if (FLAG_stress_environments && !instr->HasEnvironment()) {
-      instr = AssignEnvironment(instr);
-    }
+    // TODO(all): Add support for FLAG_stress_pointer_maps and
+    // FLAG_stress_environments.
     instr->set_hydrogen_value(current);
     chunk_->AddInstruction(instr, current_block_);
   }
@@ -923,6 +672,15 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
 }
 
 
+LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
+  HEnvironment* hydrogen_env = current_block_->last_environment();
+  int argument_index_accumulator = 0;
+  instr->set_environment(CreateEnvironment(hydrogen_env,
+                                           &argument_index_accumulator));
+  return instr;
+}
+
+
 LEnvironment* LChunkBuilder::CreateEnvironment(
     HEnvironment* hydrogen_env,
     int* argument_index_accumulator) {
@@ -931,19 +689,20 @@ LEnvironment* LChunkBuilder::CreateEnvironment(
   LEnvironment* outer =
       CreateEnvironment(hydrogen_env->outer(), argument_index_accumulator);
   BailoutId ast_id = hydrogen_env->ast_id();
-  ASSERT(!ast_id.IsNone() ||
-         hydrogen_env->frame_type() != JS_FUNCTION);
+  ASSERT(!ast_id.IsNone() || (hydrogen_env->frame_type() != JS_FUNCTION));
   int value_count = hydrogen_env->length();
+
   LEnvironment* result = new(zone()) LEnvironment(
       hydrogen_env->closure(),
       hydrogen_env->frame_type(),
       ast_id,
       hydrogen_env->parameter_count(),
-      argument_count_,
+      argument_count(),
       value_count,
       outer,
       hydrogen_env->entry(),
       zone());
+
   int argument_index = *argument_index_accumulator;
   for (int i = 0; i < value_count; ++i) {
     if (hydrogen_env->is_special_index(i)) continue;
@@ -970,1282 +729,1358 @@ LEnvironment* LChunkBuilder::CreateEnvironment(
 }
 
 
-LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
-  return new(zone()) LGoto(instr->FirstSuccessor()->block_id());
+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::DoBranch(HBranch* instr) {
-  HValue* value = instr->value();
-  if (value->EmitAtUses()) {
-    HBasicBlock* successor = HConstant::cast(value)->BooleanValue()
-        ? instr->FirstSuccessor()
-        : instr->SecondSuccessor();
-    return new(zone()) LGoto(successor->block_id());
+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();
+
+  ASSERT(instr->representation().IsSmiOrTagged());
+  ASSERT(left->representation().IsSmiOrTagged());
+  ASSERT(right->representation().IsSmiOrTagged());
+
+  LOperand* left_operand = UseFixed(left, x1);
+  LOperand* right_operand = UseFixed(right, x0);
+  LArithmeticT* result =
+      new(zone()) LArithmeticT(op, left_operand, right_operand);
+  return MarkAsCall(DefineFixed(result, x0), instr);
+}
+
+
+#define UNIMPLEMENTED_INSTRUCTION()                                     \
+  do {                                                                  \
+    static char msg[128];                                               \
+    snprintf(msg, sizeof(msg),                                          \
+             "unsupported hydrogen instruction (%s)", __func__);        \
+    info_->set_bailout_reason(msg);                                     \
+    status_ = ABORTED;                                                  \
+    return NULL;                                                        \
+  } while (0)
+
+
+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::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
+  info()->MarkAsRequiresFrame();
+  LOperand* args = NULL;
+  LOperand* length = NULL;
+  LOperand* index = NULL;
+  LOperand* temp = 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());
+    temp = TempRegister();
   }
 
-  LBranch* result = new(zone()) LBranch(UseRegister(value));
-  // Tagged values that are not known smis or booleans require a
-  // deoptimization environment.
-  Representation rep = value->representation();
-  HType type = value->type();
-  if (rep.IsTagged() && !type.IsSmi() && !type.IsBoolean()) {
-    return AssignEnvironment(result);
+  return DefineAsRegister(
+      new(zone()) LAccessArgumentsAt(args, length, index, temp));
+}
+
+
+LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
+  if (instr->representation().IsInteger32()) {
+    // TODO(all): LAddI instruction should also handle the addition of
+    // two SMI values.
+    ASSERT(instr->left()->representation().IsInteger32());
+    ASSERT(instr->right()->representation().IsInteger32());
+    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
+    LOperand* right =
+        UseRegisterOrConstantAtStart(instr->BetterRightOperand());
+    LInstruction* result = DefineAsRegister(new(zone()) LAddI(left, right));
+    if (instr->CheckFlag(HValue::kCanOverflow)) {
+      result = AssignEnvironment(result);
+    }
+    return result;
+  } else if (instr->representation().IsDouble()) {
+    return DoArithmeticD(Token::ADD, instr);
+  } else {
+    ASSERT(instr->representation().IsSmiOrTagged());
+    return DoArithmeticT(Token::ADD, instr);
   }
-  return result;
 }
 
 
-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::DoAllocate(HAllocate* instr) {
+  info()->MarkAsDeferredCalling();
+  LOperand* size = UseRegisterOrConstant(instr->size());
+  LOperand* temp1 = TempRegister();
+  LOperand* temp2 = TempRegister();
+  LAllocate* result = new(zone()) LAllocate(size, temp1, temp2);
+  return AssignPointerMap(DefineAsRegister(result));
 }
 
 
-LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* length) {
-  info()->MarkAsRequiresFrame();
-  return DefineAsRegister(
-      new(zone()) LArgumentsLength(UseRegister(length->value())));
+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* elems) {
+LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* instr) {
   info()->MarkAsRequiresFrame();
-  return DefineAsRegister(new(zone()) LArgumentsElements);
+  LOperand* temp = instr->from_inlined() ? NULL : TempRegister();
+  return DefineAsRegister(new(zone()) LArgumentsElements(temp));
 }
 
 
-LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
-  LInstanceOf* result =
-      new(zone()) LInstanceOf(UseFixed(instr->left(), a0),
-                              UseFixed(instr->right(), a1));
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* instr) {
+  info()->MarkAsRequiresFrame();
+  LOperand* value = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LArgumentsLength(value));
 }
 
 
-LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
-    HInstanceOfKnownGlobal* instr) {
-  LInstanceOfKnownGlobal* result =
-      new(zone()) LInstanceOfKnownGlobal(UseFixed(instr->left(), a0),
-                                         FixedTemp(t0));
-  return MarkAsCall(DefineFixed(result, v0), 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::DoInstanceSize(HInstanceSize* instr) {
-  LOperand* object = UseRegisterAtStart(instr->object());
-  return DefineAsRegister(new(zone()) LInstanceSize(object));
+LInstruction* LChunkBuilder::DoBitwise(HBitwise* instr) {
+  // TODO(all): The latest bleeding_edge handles smi representations too.
+  if (instr->representation().IsInteger32()) {
+    ASSERT(instr->left()->representation().IsInteger32());
+    ASSERT(instr->right()->representation().IsInteger32());
+
+    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
+    LOperand* right =
+        UseRegisterOrConstantAtStart(instr->BetterRightOperand());
+    return DefineAsRegister(new(zone()) LBitI(left, right));
+  } else {
+    return DoArithmeticT(instr->op(), 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(DefineSameAsFirst(result));
+LInstruction* LChunkBuilder::DoBitNot(HBitNot* instr) {
+  ASSERT(instr->value()->representation().IsInteger32());
+  ASSERT(instr->representation().IsInteger32());
+  if (instr->HasNoUses()) return NULL;
+  LOperand* value = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LBitNotI(value));
 }
 
 
-LInstruction* LChunkBuilder::DoApplyArguments(HApplyArguments* instr) {
-  LOperand* function = UseFixed(instr->function(), a1);
-  LOperand* receiver = UseFixed(instr->receiver(), a0);
-  LOperand* length = UseFixed(instr->length(), a2);
-  LOperand* elements = UseFixed(instr->elements(), a3);
-  LApplyArguments* result = new(zone()) LApplyArguments(function,
-                                                        receiver,
-                                                        length,
-                                                        elements);
-  return MarkAsCall(DefineFixed(result, v0), instr, CAN_DEOPTIMIZE_EAGERLY);
+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::DoPushArgument(HPushArgument* instr) {
-  ++argument_count_;
-  LOperand* argument = Use(instr->argument());
-  return new(zone()) LPushArgument(argument);
+LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
+  LOperand* value = UseRegisterOrConstantAtStart(instr->index());
+  LOperand* length = UseRegister(instr->length());
+  return AssignEnvironment(new(zone()) LBoundsCheck(value, length));
 }
 
 
-LInstruction* LChunkBuilder::DoInnerAllocatedObject(
-    HInnerAllocatedObject* inner_object) {
-  LOperand* base_object = UseRegisterAtStart(inner_object->base_object());
-  LInnerAllocatedObject* result =
-    new(zone()) LInnerAllocatedObject(base_object);
-  return DefineAsRegister(result);
-}
+LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
+  HValue* value = instr->value();
 
+  if (value->EmitAtUses()) {
+    // TODO(all): Handle this case with CheckElideControlInstruction once
+    // we've done the rebase.
+    HBasicBlock* successor = HConstant::cast(value)->BooleanValue()
+        ? instr->FirstSuccessor()
+        : instr->SecondSuccessor();
+    return new(zone()) LGoto(successor->block_id());
+  }
 
-LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
-  return instr->HasNoUses()
-      ? NULL
-      : DefineAsRegister(new(zone()) LThisFunction);
-}
+  Representation rep = value->representation();
+  HType type = value->type();
 
+  if (rep.IsTagged() && !type.IsSmi() && !type.IsBoolean()) {
+    ToBooleanStub::Types expected = instr->expected_input_types();
+    LOperand* temp1 = NULL;
+    LOperand* temp2 = NULL;
 
-LInstruction* LChunkBuilder::DoContext(HContext* instr) {
-  // If there is a non-return use, the context must be allocated in a register.
-  for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
-    if (!it.value()->IsReturn()) {
-      return DefineAsRegister(new(zone()) LContext);
+    if (expected.NeedsMap() || expected.IsEmpty()) {
+      temp1 = TempRegister();
+      temp2 = TempRegister();
     }
-  }
 
-  return NULL;
+    // Tagged values that are not known smis or booleans require a
+    // deoptimization environment.
+    return AssignEnvironment(
+        new(zone()) LBranch(UseRegister(value), temp1, temp2));
+  } else {
+    return new(zone()) LBranch(UseRegister(value), NULL, NULL);
+  }
 }
 
 
-LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
-  LOperand* context = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LOuterContext(context));
+LInstruction* LChunkBuilder::DoCallConstantFunction(
+    HCallConstantFunction* instr) {
+  argument_count_ -= instr->argument_count();
+  return MarkAsCall(DefineFixed(new(zone()) LCallConstantFunction, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
-  return MarkAsCall(new(zone()) LDeclareGlobals, instr);
+LInstruction* LChunkBuilder::DoCallFunction(HCallFunction* instr) {
+  LOperand* function = UseFixed(instr->function(), x1);
+  argument_count_ -= instr->argument_count();
+  LInstruction* result = DefineFixed(new(zone()) LCallFunction(function), x0);
+  // TODO(all): Uncomment the following line during the rebase.
+  // if (instr->IsTailCall()) return result;
+  return MarkAsCall(result, instr);
 }
 
 
-LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
-  LOperand* context = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LGlobalObject(context));
+LInstruction* LChunkBuilder::DoCallGlobal(HCallGlobal* instr) {
+  argument_count_ -= instr->argument_count();
+  return MarkAsCall(DefineFixed(new(zone()) LCallGlobal, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoGlobalReceiver(HGlobalReceiver* instr) {
-  LOperand* global_object = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LGlobalReceiver(global_object));
+LInstruction* LChunkBuilder::DoCallKeyed(HCallKeyed* instr) {
+  ASSERT(instr->key()->representation().IsTagged());
+  argument_count_ -= instr->argument_count();
+  LOperand* key = UseFixed(instr->key(), x2);
+  return MarkAsCall(DefineFixed(new(zone()) LCallKeyed(key), x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoCallConstantFunction(
-    HCallConstantFunction* instr) {
+LInstruction* LChunkBuilder::DoCallKnownGlobal(HCallKnownGlobal* instr) {
   argument_count_ -= instr->argument_count();
-  return MarkAsCall(DefineFixed(new(zone()) LCallConstantFunction, v0), instr);
+  return MarkAsCall(DefineFixed(new(zone()) LCallKnownGlobal, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
-  LOperand* function = UseFixed(instr->function(), a1);
+LInstruction* LChunkBuilder::DoCallNamed(HCallNamed* instr) {
   argument_count_ -= instr->argument_count();
-  LInvokeFunction* result = new(zone()) LInvokeFunction(function);
-  return MarkAsCall(DefineFixed(result, v0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
+  return MarkAsCall(DefineFixed(new(zone()) LCallNamed, x0), instr);
 }
 
 
-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 kMathSin: return DoMathSin(instr);
-    case kMathCos: return DoMathCos(instr);
-    case kMathTan: return DoMathTan(instr);
-    case kMathExp: return DoMathExp(instr);
-    case kMathSqrt: return DoMathSqrt(instr);
-    case kMathPowHalf: return DoMathPowHalf(instr);
-    default:
-      UNREACHABLE();
-      return NULL;
-  }
+LInstruction* LChunkBuilder::DoCallNew(HCallNew* instr) {
+  // The call to CallConstructStub will expect the constructor to be in x1.
+  LOperand* constructor = UseFixed(instr->constructor(), x1);
+  argument_count_ -= instr->argument_count();
+  LCallNew* result = new(zone()) LCallNew(constructor);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoMathLog(HUnaryMathOperation* instr) {
-  LOperand* input = UseFixedDouble(instr->value(), f4);
-  LMathLog* result = new(zone()) LMathLog(input);
-  return MarkAsCall(DefineFixedDouble(result, f4), instr);
+LInstruction* LChunkBuilder::DoCallNewArray(HCallNewArray* instr) {
+  // The call to ArrayConstructCode will expect the constructor to be in x1.
+  LOperand* constructor = UseFixed(instr->constructor(), x1);
+  argument_count_ -= instr->argument_count();
+  LCallNewArray* result = new(zone()) LCallNewArray(constructor);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoMathSin(HUnaryMathOperation* instr) {
-  LOperand* input = UseFixedDouble(instr->value(), f4);
-  LMathSin* result = new(zone()) LMathSin(input);
-  return MarkAsCall(DefineFixedDouble(result, f4), instr);
+LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
+  argument_count_ -= instr->argument_count();
+  return MarkAsCall(DefineFixed(new(zone()) LCallRuntime, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoMathCos(HUnaryMathOperation* instr) {
-  LOperand* input = UseFixedDouble(instr->value(), f4);
-  LMathCos* result = new(zone()) LMathCos(input);
-  return MarkAsCall(DefineFixedDouble(result, f4), instr);
+LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
+  argument_count_ -= instr->argument_count();
+  return MarkAsCall(DefineFixed(new(zone()) LCallStub, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoMathTan(HUnaryMathOperation* instr) {
-  LOperand* input = UseFixedDouble(instr->value(), f4);
-  LMathTan* result = new(zone()) LMathTan(input);
-  return MarkAsCall(DefineFixedDouble(result, f4), instr);
-}
+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();
+  }
 
-LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
-  ASSERT(instr->representation().IsDouble());
-  ASSERT(instr->value()->representation().IsDouble());
-  LOperand* input = UseTempRegister(instr->value());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LOperand* double_temp = FixedTemp(f6);  // Chosen by fair dice roll.
-  LMathExp* result = new(zone()) LMathExp(input, double_temp, temp1, temp2);
-  return DefineAsRegister(result);
+  if (from.IsTagged()) {
+    if (to.IsDouble()) {
+      info()->MarkAsDeferredCalling();
+      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()) {
+        LOperand* value = UseRegisterAtStart(instr->value());
+        res = DefineAsRegister(new(zone()) LSmiUntag(value, false));
+      } else {
+        LOperand* value = UseRegister(instr->value());
+        LOperand* temp1 = TempRegister();
+        LOperand* temp2 =
+            instr->CanTruncateToInt32() ? TempRegister() : FixedTemp(d24);
+        res = DefineAsRegister(new(zone()) LTaggedToI(value, temp1, temp2));
+        res = AssignEnvironment(res);
+      }
+
+      return res;
+    }
+  } else if (from.IsDouble()) {
+    if (to.IsTagged()) {
+      info()->MarkAsDeferredCalling();
+      LOperand* value = UseRegister(instr->value());
+      LOperand* temp1 = TempRegister();
+      LOperand* temp2 = TempRegister();
+
+      LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
+      return AssignPointerMap(DefineAsRegister(result));
+    } else if (to.IsSmi()) {
+      // TODO(all): Split LDoubleToSmi into two instructions.
+      LOperand* value = UseRegister(instr->value());
+      LOperand* temp1 = instr->CanTruncateToInt32() ? TempRegister() : NULL;
+      LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister() : NULL;
+      LDoubleToSmi* result = new(zone()) LDoubleToSmi(value, temp1, temp2);
+      return AssignEnvironment(DefineAsRegister(result));
+    } else {
+      // TODO(all): Split LDoubleToI into two instructions, truncating and not.
+      ASSERT(to.IsInteger32());
+      LOperand* value = UseRegister(instr->value());
+      LOperand* temp1 = instr->CanTruncateToInt32() ? TempRegister() : NULL;
+      LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister() : NULL;
+      LDoubleToI* result = new(zone()) LDoubleToI(value, temp1, temp2);
+      return AssignEnvironment(DefineAsRegister(result));
+    }
+  } 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,
+                                                      TempRegister(),
+                                                      TempRegister());
+        return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
+      } else {
+        STATIC_ASSERT((kMinInt == Smi::kMinValue) &&
+                      (kMaxInt == Smi::kMaxValue));
+        return DefineAsRegister(new(zone()) LSmiTag(value));
+      }
+    } else if (to.IsSmi()) {
+      LOperand* value = UseRegisterAtStart(instr->value());
+      // This cannot deoptimize because an A64 smi can represent any int32.
+      return DefineAsRegister(new(zone()) LInteger32ToSmi(value));
+    } else {
+      ASSERT(to.IsDouble());
+      if (instr->value()->CheckFlag(HInstruction::kUint32)) {
+        return DefineAsRegister(
+            new(zone()) LUint32ToDouble(UseRegisterAtStart(instr->value())));
+      } else {
+        return DefineAsRegister(
+            new(zone()) LInteger32ToDouble(UseRegisterAtStart(instr->value())));
+      }
+    }
+  }
+
+  UNREACHABLE();
+  return NULL;
 }
 
 
-LInstruction* LChunkBuilder::DoMathPowHalf(HUnaryMathOperation* instr) {
-  // Input cannot be the same as the result, see LCodeGen::DoMathPowHalf.
-  LOperand* input = UseFixedDouble(instr->value(), f8);
-  LOperand* temp = FixedTemp(f6);
-  LMathPowHalf* result = new(zone()) LMathPowHalf(input, temp);
-  return DefineFixedDouble(result, f4);
+LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* 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.
+  LOperand* value = UseRegister(instr->value());
+  LOperand* temp = TempRegister();
+  return AssignEnvironment(new(zone()) LCheckFunction(value, temp));
 }
 
 
-LInstruction* LChunkBuilder::DoMathAbs(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegister(instr->value());
-  LMathAbs* result = new(zone()) LMathAbs(input);
-  return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
+LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
+  LOperand* value = UseRegisterAtStart(instr->value());
+  LOperand* temp = TempRegister();
+  LInstruction* result = new(zone()) LCheckInstanceType(value, temp);
+  return AssignEnvironment(result);
 }
 
 
-LInstruction* LChunkBuilder::DoMathFloor(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegister(instr->value());
+LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
+  LOperand* value = UseRegister(instr->value());
   LOperand* temp = TempRegister();
-  LMathFloor* result = new(zone()) LMathFloor(input, temp);
-  return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
+  LInstruction* result = new(zone()) LCheckMaps(value, temp);
+  return AssignEnvironment(result);
 }
 
 
-LInstruction* LChunkBuilder::DoMathSqrt(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegister(instr->value());
-  LMathSqrt* result = new(zone()) LMathSqrt(input);
-  return DefineAsRegister(result);
+LInstruction* LChunkBuilder::DoCheckNonSmi(HCheckNonSmi* instr) {
+  // TODO(all): On newer v8 versions, this hydrogen instruction has been renamed
+  // into HCheckHeapObject but still translate into LCheckNonSmi.
+  LOperand* value = UseRegisterAtStart(instr->value());
+  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
 }
 
 
-LInstruction* LChunkBuilder::DoMathRound(HUnaryMathOperation* instr) {
-  LOperand* input = UseRegister(instr->value());
-  LOperand* temp = FixedTemp(f6);
-  LMathRound* result = new(zone()) LMathRound(input, temp);
-  return AssignEnvironment(DefineAsRegister(result));
+LInstruction* LChunkBuilder::DoCheckPrototypeMaps(HCheckPrototypeMaps* instr) {
+  // TODO(jbramley): The scratch registers are not needed if
+  // instr->CanOmitPrototypeChecks(). Can we safely test that here?
+  LOperand* temp1 = TempRegister();
+  LOperand* temp2 = TempRegister();
+  return AssignEnvironment(new(zone()) LCheckPrototypeMaps(temp1, temp2));
 }
 
 
-LInstruction* LChunkBuilder::DoCallKeyed(HCallKeyed* instr) {
-  ASSERT(instr->key()->representation().IsTagged());
-  argument_count_ -= instr->argument_count();
-  LOperand* key = UseFixed(instr->key(), a2);
-  return MarkAsCall(DefineFixed(new(zone()) LCallKeyed(key), v0), instr);
+LInstruction* LChunkBuilder::DoClampToUint8(HClampToUint8* instr) {
+  HValue* value = instr->value();
+  Representation input_rep = value->representation();
+  LOperand* reg = UseRegister(value);
+  if (input_rep.IsDouble()) {
+    return DefineAsRegister(new(zone()) LClampDToUint8(reg));
+  } else if (input_rep.IsInteger32()) {
+    return DefineAsRegister(new(zone()) LClampIToUint8(reg));
+  } else {
+    ASSERT(input_rep.IsSmiOrTagged());
+    return AssignEnvironment(
+        DefineAsRegister(new(zone()) LClampTToUint8(reg,
+                                                    TempRegister(),
+                                                    FixedTemp(d24))));
+  }
+}
+
+
+LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
+    HClassOfTestAndBranch* instr) {
+  ASSERT(instr->value()->representation().IsTagged());
+  LOperand* value = UseRegisterAtStart(instr->value());
+  return new(zone()) LClassOfTestAndBranch(value,
+                                           TempRegister(),
+                                           TempRegister());
 }
 
 
-LInstruction* LChunkBuilder::DoCallNamed(HCallNamed* instr) {
-  argument_count_ -= instr->argument_count();
-  return MarkAsCall(DefineFixed(new(zone()) LCallNamed, v0), instr);
-}
-
+LInstruction* LChunkBuilder::DoCompareIDAndBranch(HCompareIDAndBranch* instr) {
+  Representation r = instr->representation();
 
-LInstruction* LChunkBuilder::DoCallGlobal(HCallGlobal* instr) {
-  argument_count_ -= instr->argument_count();
-  return MarkAsCall(DefineFixed(new(zone()) LCallGlobal, v0), instr);
+  // TODO(all): This instruction has been replaced by HCompareNumericAndBranch
+  // on bleeding_edge. We should update when we'll do the rebase.
+  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()) LCmpIDAndBranch(left, right);
+  } else {
+    ASSERT(r.IsDouble());
+    ASSERT(instr->left()->representation().IsDouble());
+    ASSERT(instr->right()->representation().IsDouble());
+    // TODO(all): In fact the only case that we can handle more efficiently is
+    // when one of the operand is the constant 0. Currently the MacroAssembler
+    // will be able to cope with any constant by loading it into an internal
+    // scratch register. This means that if the constant is used more that once,
+    // it will be loaded multiple times. Unfortunatly crankshaft already
+    // duplicates constant loads, but we should modify the code below once this
+    // issue has been addressed in crankshaft.
+    LOperand* left = UseRegisterOrConstantAtStart(instr->left());
+    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
+    return new(zone()) LCmpIDAndBranch(left, right);
+  }
 }
 
 
-LInstruction* LChunkBuilder::DoCallKnownGlobal(HCallKnownGlobal* instr) {
-  argument_count_ -= instr->argument_count();
-  return MarkAsCall(DefineFixed(new(zone()) LCallKnownGlobal, v0), instr);
+LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
+  ASSERT(instr->left()->representation().IsTagged());
+  ASSERT(instr->right()->representation().IsTagged());
+  LOperand* left = UseFixed(instr->left(), x1);
+  LOperand* right = UseFixed(instr->right(), x0);
+  LCmpT* result = new(zone()) LCmpT(left, right);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoCallNew(HCallNew* instr) {
-  LOperand* constructor = UseFixed(instr->constructor(), a1);
-  argument_count_ -= instr->argument_count();
-  LCallNew* result = new(zone()) LCallNew(constructor);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
+    HCompareObjectEqAndBranch* instr) {
+  LOperand* left = UseRegisterAtStart(instr->left());
+  LOperand* right = UseRegisterAtStart(instr->right());
+  return new(zone()) LCmpObjectEqAndBranch(left, right);
 }
 
 
-LInstruction* LChunkBuilder::DoCallNewArray(HCallNewArray* instr) {
-  LOperand* constructor = UseFixed(instr->constructor(), a1);
-  argument_count_ -= instr->argument_count();
-  LCallNewArray* result = new(zone()) LCallNewArray(constructor);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+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::DoCallFunction(HCallFunction* instr) {
-  LOperand* function = UseFixed(instr->function(), a1);
-  argument_count_ -= instr->argument_count();
-  return MarkAsCall(DefineFixed(new(zone()) LCallFunction(function), v0),
-                    instr);
+LInstruction* LChunkBuilder::DoCompareConstantEqAndBranch(
+    HCompareConstantEqAndBranch* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
-  argument_count_ -= instr->argument_count();
-  return MarkAsCall(DefineFixed(new(zone()) LCallRuntime, v0), instr);
+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.IsTagged()) {
+    return DefineAsRegister(new(zone()) LConstantT);
+  } else {
+    UNREACHABLE();
+    return NULL;
+  }
 }
 
 
-LInstruction* LChunkBuilder::DoRor(HRor* instr) {
-  return DoShift(Token::ROR, instr);
-}
-
+LInstruction* LChunkBuilder::DoContext(HContext* instr) {
+  // If there is a non-return use, the context must be allocated in a register.
+  for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
+    if (!it.value()->IsReturn()) {
+      return DefineAsRegister(new(zone()) LContext);
+    }
+  }
 
-LInstruction* LChunkBuilder::DoShr(HShr* instr) {
-  return DoShift(Token::SHR, instr);
+  return NULL;
 }
 
 
-LInstruction* LChunkBuilder::DoSar(HSar* instr) {
-  return DoShift(Token::SAR, instr);
+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::DoShl(HShl* instr) {
-  return DoShift(Token::SHL, instr);
+LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* instr) {
+  return new(zone()) LDebugBreak();
 }
 
 
-LInstruction* LChunkBuilder::DoBitwise(HBitwise* instr) {
-  if (instr->representation().IsInteger32()) {
-    ASSERT(instr->left()->representation().IsInteger32());
-    ASSERT(instr->right()->representation().IsInteger32());
+LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
+}
 
-    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
-    LOperand* right = UseOrConstantAtStart(instr->BetterRightOperand());
-    return DefineAsRegister(new(zone()) LBitI(left, right));
-  } else {
-    ASSERT(instr->representation().IsSmiOrTagged());
-    ASSERT(instr->left()->representation().IsSmiOrTagged());
-    ASSERT(instr->right()->representation().IsSmiOrTagged());
 
-    LOperand* left = UseFixed(instr->left(), a1);
-    LOperand* right = UseFixed(instr->right(), a0);
-    LArithmeticT* result = new(zone()) LArithmeticT(instr->op(), left, right);
-    return MarkAsCall(DefineFixed(result, v0), instr);
-  }
+LInstruction* LChunkBuilder::DoDeleteProperty(HDeleteProperty* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-LInstruction* LChunkBuilder::DoBitNot(HBitNot* instr) {
-  ASSERT(instr->value()->representation().IsInteger32());
-  ASSERT(instr->representation().IsInteger32());
-  if (instr->HasNoUses()) return NULL;
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LBitNotI(value));
+LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
+  return AssignEnvironment(new(zone()) LDeoptimize);
 }
 
 
 LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
-  if (instr->representation().IsDouble()) {
+  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->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));
+    }
+    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 if (instr->representation().IsInteger32()) {
-    // TODO(1042) The fixed register allocation
-    // is needed because we call TypeRecordingBinaryOpStub from
-    // the generated code, which requires registers a0
-    // and a1 to be used. We should remove that
-    // when we provide a native implementation.
-    LOperand* dividend = UseFixed(instr->left(), a0);
-    LOperand* divisor = UseFixed(instr->right(), a1);
-    return AssignEnvironment(AssignPointerMap(
-             DefineFixed(new(zone()) LDivI(dividend, divisor), v0)));
   } else {
     return DoArithmeticT(Token::DIV, instr);
   }
 }
 
 
-LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
-  UNIMPLEMENTED();
-  return NULL;
+LInstruction* LChunkBuilder::DoDummyUse(HDummyUse* instr) {
+  return DefineAsRegister(new(zone()) LDummyUse(UseAny(instr->value())));
 }
 
 
-LInstruction* LChunkBuilder::DoMod(HMod* instr) {
-  HValue* left = instr->left();
-  HValue* right = instr->right();
-  if (instr->representation().IsInteger32()) {
-    ASSERT(left->representation().IsInteger32());
-    ASSERT(right->representation().IsInteger32());
-    if (instr->HasPowerOf2Divisor()) {
-      ASSERT(!right->CanBeZero());
-      LModI* mod = new(zone()) LModI(UseRegisterAtStart(left),
-                                     UseOrConstant(right));
-      LInstruction* result = DefineAsRegister(mod);
-      return (left->CanBeNegative() &&
-              instr->CheckFlag(HValue::kBailoutOnMinusZero))
-          ? AssignEnvironment(result)
-          : result;
-    } else {
-      LModI* mod = new(zone()) LModI(UseRegister(left),
-                                     UseRegister(right),
-                                     TempRegister(),
-                                     FixedTemp(f20),
-                                     FixedTemp(f22));
-      LInstruction* result = DefineAsRegister(mod);
-      return (right->CanBeZero() ||
-              (left->RangeCanInclude(kMinInt) &&
-               right->RangeCanInclude(-1)) ||
-              instr->CheckFlag(HValue::kBailoutOnMinusZero))
-          ? AssignEnvironment(result)
-          : result;
-    }
-  } else if (instr->representation().IsSmiOrTagged()) {
-    return DoArithmeticT(Token::MOD, instr);
-  } else {
-    ASSERT(instr->representation().IsDouble());
-    // We call a C function for double modulo. It can't trigger a GC. We need
-    // to use fixed result register for the call.
-    // TODO(fschneider): Allow any register as input registers.
-    LArithmeticD* mod = new(zone()) LArithmeticD(Token::MOD,
-                                                 UseFixedDouble(left, f2),
-                                                 UseFixedDouble(right, f4));
-    return MarkAsCall(DefineFixedDouble(mod, f2), instr);
-  }
+LInstruction* LChunkBuilder::DoElementsKind(HElementsKind* instr) {
+  LOperand* object = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LElementsKind(object));
 }
 
 
-LInstruction* LChunkBuilder::DoMul(HMul* instr) {
-  if (instr->representation().IsInteger32()) {
-    ASSERT(instr->left()->representation().IsInteger32());
-    ASSERT(instr->right()->representation().IsInteger32());
-    LOperand* left;
-    LOperand* right = UseOrConstant(instr->BetterRightOperand());
-    LOperand* temp = NULL;
-    if (instr->CheckFlag(HValue::kBailoutOnMinusZero) &&
-        (instr->CheckFlag(HValue::kCanOverflow) ||
-        !right->IsConstantOperand())) {
-      left = UseRegister(instr->BetterLeftOperand());
-      temp = TempRegister();
-    } else {
-      left = UseRegisterAtStart(instr->BetterLeftOperand());
-    }
-    LMulI* mul = new(zone()) LMulI(left, right, temp);
-    if (instr->CheckFlag(HValue::kCanOverflow) ||
-        instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
-      AssignEnvironment(mul);
-    }
-    return DefineAsRegister(mul);
-
-  } else if (instr->representation().IsDouble()) {
-    if (kArchVariant == kMips32r2) {
-      if (instr->UseCount() == 1 && instr->uses().value()->IsAdd()) {
-        HAdd* add = HAdd::cast(instr->uses().value());
-        if (instr == add->left()) {
-          // This mul is the lhs of an add. The add and mul will be folded
-          // into a multiply-add.
-          return NULL;
-        }
-        if (instr == add->right() && !add->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.
-          return NULL;
-        }
-      }
-    }
-    return DoArithmeticD(Token::MUL, instr);
-  } else {
-    return DoArithmeticT(Token::MUL, instr);
+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(),
+                                               instr->undefined_receiver());
+  if (instr->arguments_var() != NULL) {
+    inner->Bind(instr->arguments_var(), graph()->GetArgumentsObject());
   }
+  inner->set_entry(instr);
+  current_block_->UpdateEnvironment(inner);
+  chunk_->AddInlinedClosure(instr->closure());
+  return NULL;
 }
 
 
-LInstruction* LChunkBuilder::DoSub(HSub* instr) {
-  if (instr->representation().IsInteger32()) {
-    ASSERT(instr->left()->representation().IsInteger32());
-    ASSERT(instr->right()->representation().IsInteger32());
-    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()) {
-    return DoArithmeticD(Token::SUB, instr);
-  } else {
-    return DoArithmeticT(Token::SUB, instr);
-  }
+LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
+  UNREACHABLE();
+  return NULL;
 }
 
 
-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::DoFixedArrayBaseLength(
+    HFixedArrayBaseLength* instr) {
+  LOperand* array = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LFixedArrayBaseLength(array));
 }
 
 
-LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
-  if (instr->representation().IsInteger32()) {
-    ASSERT(instr->left()->representation().IsInteger32());
-    ASSERT(instr->right()->representation().IsInteger32());
-    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().IsDouble()) {
-    if (kArchVariant == kMips32r2) {
-      if (instr->left()->IsMul())
-        return DoMultiplyAdd(HMul::cast(instr->left()), instr->right());
+LInstruction* LChunkBuilder::DoForceRepresentation(
+    HForceRepresentation* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
+}
 
-      if (instr->right()->IsMul()) {
-        ASSERT(!instr->left()->IsMul());
-        return DoMultiplyAdd(HMul::cast(instr->right()), instr->left());
-      }
-    }
-    return DoArithmeticD(Token::ADD, instr);
-  } else {
-    ASSERT(instr->representation().IsSmiOrTagged());
-    return DoArithmeticT(Token::ADD, instr);
-  }
+
+LInstruction* LChunkBuilder::DoFunctionLiteral(HFunctionLiteral* instr) {
+  return MarkAsCall(DefineFixed(new(zone()) LFunctionLiteral, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoMathMinMax(HMathMinMax* instr) {
-  LOperand* left = NULL;
-  LOperand* right = NULL;
-  if (instr->representation().IsInteger32()) {
-    ASSERT(instr->left()->representation().IsInteger32());
-    ASSERT(instr->right()->representation().IsInteger32());
-    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::DoGetCachedArrayIndex(
+    HGetCachedArrayIndex* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-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(), f2);
-  LOperand* right = exponent_type.IsDouble() ?
-      UseFixedDouble(instr->right(), f4) :
-      UseFixed(instr->right(), a2);
-  LPower* result = new(zone()) LPower(left, right);
-  return MarkAsCall(DefineFixedDouble(result, f0),
-                    instr,
-                    CAN_DEOPTIMIZE_EAGERLY);
+LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
+  LOperand* context = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LGlobalObject(context));
 }
 
 
-LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
-  ASSERT(instr->representation().IsDouble());
-  ASSERT(instr->global_object()->representation().IsTagged());
-  LOperand* global_object = UseFixed(instr->global_object(), a0);
-  LRandom* result = new(zone()) LRandom(global_object);
-  return MarkAsCall(DefineFixedDouble(result, f0), instr);
+LInstruction* LChunkBuilder::DoGlobalReceiver(HGlobalReceiver* instr) {
+  LOperand* global_object = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LGlobalReceiver(global_object));
 }
 
 
-LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
-  ASSERT(instr->left()->representation().IsTagged());
-  ASSERT(instr->right()->representation().IsTagged());
-  LOperand* left = UseFixed(instr->left(), a1);
-  LOperand* right = UseFixed(instr->right(), a0);
-  LCmpT* result = new(zone()) LCmpT(left, right);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
+  return new(zone()) LGoto(instr->FirstSuccessor()->block_id());
 }
 
 
-LInstruction* LChunkBuilder::DoCompareIDAndBranch(
-    HCompareIDAndBranch* instr) {
-  Representation r = instr->representation();
-  if (r.IsSmiOrInteger32()) {
-    ASSERT(instr->left()->representation().IsSmiOrInteger32());
-    ASSERT(instr->left()->representation().Equals(
-        instr->right()->representation()));
-    LOperand* left = UseRegisterOrConstantAtStart(instr->left());
-    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-    return new(zone()) LCmpIDAndBranch(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());
-    return new(zone()) LCmpIDAndBranch(left, right);
-  }
+LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
+    HHasCachedArrayIndexAndBranch* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
+}
+
+
+LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
+    HHasInstanceTypeAndBranch* instr) {
+  ASSERT(instr->value()->representation().IsTagged());
+  LOperand* value = UseRegisterAtStart(instr->value());
+  return new(zone()) LHasInstanceTypeAndBranch(value, TempRegister());
+}
+
+
+LInstruction* LChunkBuilder::DoIn(HIn* instr) {
+  LOperand* key = UseRegisterAtStart(instr->key());
+  LOperand* object = UseRegisterAtStart(instr->object());
+  LIn* result = new(zone()) LIn(key, object);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
-    HCompareObjectEqAndBranch* instr) {
-  LOperand* left = UseRegisterAtStart(instr->left());
-  LOperand* right = UseRegisterAtStart(instr->right());
-  return new(zone()) LCmpObjectEqAndBranch(left, right);
+LInstruction* LChunkBuilder::DoInductionVariableAnnotation(
+    HInductionVariableAnnotation* instr) {
+  return NULL;
 }
 
 
-LInstruction* LChunkBuilder::DoCompareConstantEqAndBranch(
-    HCompareConstantEqAndBranch* instr) {
-  return new(zone()) LCmpConstantEqAndBranch(
-      UseRegisterAtStart(instr->value()));
+LInstruction* LChunkBuilder::DoInnerAllocatedObject(
+    HInnerAllocatedObject* inner_object) {
+  LOperand* base_object = UseRegisterAtStart(inner_object->base_object());
+  return DefineAsRegister(new(zone()) LInnerAllocatedObject(base_object));
 }
 
 
-LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* temp = TempRegister();
-  return new(zone()) LIsObjectAndBranch(UseRegisterAtStart(instr->value()),
-                                        temp);
+LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
+  LInstanceOf* result = new(zone()) LInstanceOf(
+      UseFixed(instr->left(), InstanceofStub::left()),
+      UseFixed(instr->right(), InstanceofStub::right()));
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* temp = TempRegister();
-  return new(zone()) LIsStringAndBranch(UseRegisterAtStart(instr->value()),
-                                        temp);
+LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
+    HInstanceOfKnownGlobal* instr) {
+  LInstanceOfKnownGlobal* result = new(zone()) LInstanceOfKnownGlobal(
+      UseFixed(instr->left(), InstanceofStub::left()));
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LIsSmiAndBranch(Use(instr->value()));
+LInstruction* LChunkBuilder::DoInstanceSize(HInstanceSize* instr) {
+  LOperand* object = UseRegisterAtStart(instr->object());
+  return DefineAsRegister(new(zone()) LInstanceSize(object));
 }
 
 
-LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
-    HIsUndetectableAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LIsUndetectableAndBranch(
-      UseRegisterAtStart(instr->value()), TempRegister());
+LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
+  // The function is required (by MacroAssembler::InvokeFunction) to be in x1.
+  LOperand* function = UseFixed(instr->function(), x1);
+  argument_count_ -= instr->argument_count();
+  LInvokeFunction* result = new(zone()) LInvokeFunction(function);
+  return MarkAsCall(DefineFixed(result, x0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
 }
 
 
-LInstruction* LChunkBuilder::DoStringCompareAndBranch(
-    HStringCompareAndBranch* instr) {
-  ASSERT(instr->left()->representation().IsTagged());
-  ASSERT(instr->right()->representation().IsTagged());
-  LOperand* left = UseFixed(instr->left(), a1);
-  LOperand* right = UseFixed(instr->right(), a0);
-  LStringCompareAndBranch* result =
-      new(zone()) LStringCompareAndBranch(left, right);
-  return MarkAsCall(result, instr);
+LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
+    HIsConstructCallAndBranch* instr) {
+  return new(zone()) LIsConstructCallAndBranch(TempRegister(), TempRegister());
 }
 
 
-LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
-    HHasInstanceTypeAndBranch* instr) {
+LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* value = UseRegisterAtStart(instr->value());
-  return new(zone()) LHasInstanceTypeAndBranch(value);
+  LOperand* temp1 = TempRegister();
+  LOperand* temp2 = TempRegister();
+  return new(zone()) LIsObjectAndBranch(value, temp1, temp2);
 }
 
 
-LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
-    HGetCachedArrayIndex* instr)  {
+LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* value = UseRegisterAtStart(instr->value());
-
-  return DefineAsRegister(new(zone()) LGetCachedArrayIndex(value));
+  LOperand* temp = TempRegister();
+  return new(zone()) LIsStringAndBranch(value, temp);
 }
 
 
-LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
-    HHasCachedArrayIndexAndBranch* instr) {
+LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LHasCachedArrayIndexAndBranch(
-      UseRegisterAtStart(instr->value()));
+  return new(zone()) LIsSmiAndBranch(UseRegisterAtStart(instr->value()));
 }
 
 
-LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
-    HClassOfTestAndBranch* instr) {
+LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
+    HIsUndetectableAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LClassOfTestAndBranch(UseRegister(instr->value()),
-                                           TempRegister());
+  LOperand* value = UseRegisterAtStart(instr->value());
+  return new(zone()) LIsUndetectableAndBranch(value, TempRegister());
 }
 
 
-LInstruction* LChunkBuilder::DoFixedArrayBaseLength(
-    HFixedArrayBaseLength* instr) {
-  LOperand* array = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LFixedArrayBaseLength(array));
-}
+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);
+    argument_count_ -= argument_count;
+  }
 
-LInstruction* LChunkBuilder::DoMapEnumLength(HMapEnumLength* instr) {
-  LOperand* map = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LMapEnumLength(map));
+  HEnvironment* outer =
+      current_block_->last_environment()->DiscardInlined(false);
+  current_block_->UpdateEnvironment(outer);
+
+  return pop;
 }
 
 
-LInstruction* LChunkBuilder::DoElementsKind(HElementsKind* instr) {
-  LOperand* object = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LElementsKind(object));
+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::DoValueOf(HValueOf* instr) {
-  LOperand* object = UseRegister(instr->value());
-  LValueOf* result = new(zone()) LValueOf(object, TempRegister());
-  return DefineAsRegister(result);
+LInstruction* LChunkBuilder::DoLoadExternalArrayPointer(
+    HLoadExternalArrayPointer* instr) {
+  LOperand* input = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LLoadExternalArrayPointer(input));
 }
 
 
-LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
-  LOperand* object = UseFixed(instr->value(), a0);
-  LDateField* result =
-      new(zone()) LDateField(object, FixedTemp(a1), instr->index());
-  return MarkAsCall(DefineFixed(result, v0), instr, CAN_DEOPTIMIZE_EAGERLY);
+LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
+    HLoadFunctionPrototype* instr) {
+  LOperand* function = UseRegister(instr->function());
+  LOperand* temp = TempRegister();
+  return AssignEnvironment(DefineAsRegister(
+      new(zone()) LLoadFunctionPrototype(function, temp)));
 }
 
 
-LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
-  LOperand* string = UseRegister(instr->string());
-  LOperand* index = UseRegister(instr->index());
-  LOperand* value = UseTempRegister(instr->value());
-  LSeqStringSetChar* result =
-      new(zone()) LSeqStringSetChar(instr->encoding(), string, index, value);
-  return DefineAsRegister(result);
+LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
+  LLoadGlobalCell* result = new(zone()) LLoadGlobalCell();
+  return instr->RequiresHoleCheck()
+      ? AssignEnvironment(DefineAsRegister(result))
+      : DefineAsRegister(result);
 }
 
 
-LInstruction* LChunkBuilder::DoNumericConstraint(HNumericConstraint* instr) {
-  return NULL;
+LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
+  LOperand* global_object = UseFixed(instr->global_object(), x0);
+  LLoadGlobalGeneric* result = new(zone()) LLoadGlobalGeneric(global_object);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoInductionVariableAnnotation(
-    HInductionVariableAnnotation* instr) {
-  return NULL;
+LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
+  ASSERT(instr->key()->representation().IsInteger32() ||
+         instr->key()->representation().IsSmi());
+  ElementsKind elements_kind = instr->elements_kind();
+  LOperand* elements = UseRegister(instr->elements());
+  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
+
+  if (!instr->is_external()) {
+    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());
+      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() &&
+            (elements_kind != EXTERNAL_FLOAT_ELEMENTS) &&
+            (elements_kind != EXTERNAL_DOUBLE_ELEMENTS)) ||
+           (instr->representation().IsDouble() &&
+            ((elements_kind == EXTERNAL_FLOAT_ELEMENTS) ||
+             (elements_kind == EXTERNAL_DOUBLE_ELEMENTS))));
+
+    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.
+    return (elements_kind == EXTERNAL_UNSIGNED_INT_ELEMENTS)
+        ? AssignEnvironment(DefineAsRegister(result))
+        : DefineAsRegister(result);
+  }
 }
 
 
-LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
-  LOperand* value = UseRegisterOrConstantAtStart(instr->index());
-  LOperand* length = UseRegister(instr->length());
-  return AssignEnvironment(new(zone()) LBoundsCheck(value, length));
+LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
+  LOperand* object = UseFixed(instr->object(), x1);
+  LOperand* key = UseFixed(instr->key(), x0);
+
+  LInstruction* result =
+      DefineFixed(new(zone()) LLoadKeyedGeneric(object, key), x0);
+  return MarkAsCall(result, instr);
 }
 
 
-LInstruction* LChunkBuilder::DoBoundsCheckBaseIndexInformation(
-    HBoundsCheckBaseIndexInformation* instr) {
-  UNREACHABLE();
-  return NULL;
+LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
+  LOperand* object = UseRegisterAtStart(instr->object());
+  return DefineAsRegister(new(zone()) LLoadNamedField(object));
 }
 
 
-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::DoLoadNamedFieldPolymorphic(
+    HLoadNamedFieldPolymorphic* instr) {
+  ASSERT(instr->representation().IsTagged());
+  if (instr->need_generic()) {
+    LOperand* obj = UseFixed(instr->object(), x0);
+    LLoadNamedFieldPolymorphic* result =
+        new(zone()) LLoadNamedFieldPolymorphic(obj);
+    return MarkAsCall(DefineFixed(result, x0), instr);
+  } else {
+    LOperand* obj = UseRegister(instr->object());
+    LLoadNamedFieldPolymorphic* result =
+        new(zone()) LLoadNamedFieldPolymorphic(obj);
+    return AssignEnvironment(DefineAsRegister(result));
+  }
 }
 
 
-LInstruction* LChunkBuilder::DoThrow(HThrow* instr) {
-  LOperand* value = UseFixed(instr->value(), a0);
-  return MarkAsCall(new(zone()) LThrow(value), instr);
+LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
+  LOperand* object = UseFixed(instr->object(), x0);
+  LInstruction* result = DefineFixed(new(zone()) LLoadNamedGeneric(object), x0);
+  return MarkAsCall(result, instr);
 }
 
 
-LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
-  return NULL;
+LInstruction* LChunkBuilder::DoMapEnumLength(HMapEnumLength* instr) {
+  LOperand* map = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LMapEnumLength(map));
 }
 
 
-LInstruction* LChunkBuilder::DoForceRepresentation(HForceRepresentation* bad) {
-  // All HForceRepresentation instructions should be eliminated in the
-  // representation change phase of Hydrogen.
-  UNREACHABLE();
-  return NULL;
+LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-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();
+LInstruction* LChunkBuilder::DoMathMinMax(HMathMinMax* instr) {
+  LOperand* left = NULL;
+  LOperand* right = NULL;
+  if (instr->representation().IsInteger32()) {
+    ASSERT(instr->left()->representation().IsInteger32());
+    ASSERT(instr->right()->representation().IsInteger32());
+    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());
   }
-  if (from.IsTagged()) {
-    if (to.IsDouble()) {
-      info()->MarkAsDeferredCalling();
-      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;
-      if (instr->value()->type().IsSmi()) {
-        value = UseRegisterAtStart(instr->value());
-        res = DefineAsRegister(new(zone()) LSmiUntag(value, false));
-      } else {
-        value = UseRegister(instr->value());
-        LOperand* temp1 = TempRegister();
-        LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister()
-                                                      : NULL;
-        LOperand* temp3 = FixedTemp(f22);
-        res = DefineSameAsFirst(new(zone()) LTaggedToI(value,
-                                                       temp1,
-                                                       temp2,
-                                                       temp3));
-        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();
+  return DefineAsRegister(new(zone()) LMathMinMax(left, right));
+}
 
-      // 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,
-          TempRegister(), TempRegister())));
-    } else {
-      ASSERT(to.IsInteger32());
-      LOperand* value = UseRegister(instr->value());
-      LOperand* temp1 = TempRegister();
-      LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister() : NULL;
-      LDoubleToI* res = new(zone()) LDoubleToI(value, temp1, temp2);
-      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(DefineSameAsFirst(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 =
-          DefineSameAsFirst(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())));
-      }
-    }
+
+LInstruction* LChunkBuilder::DoMod(HMod* instr) {
+  if (instr->representation().IsInteger32()) {
+    ASSERT(instr->left()->representation().IsInteger32());
+    ASSERT(instr->right()->representation().IsInteger32());
+
+    UNIMPLEMENTED_INSTRUCTION();
+  } else if (instr->representation().IsSmiOrTagged()) {
+    UNIMPLEMENTED_INSTRUCTION();
+  } else {
+    return DoArithmeticD(Token::MOD, instr);
   }
-  UNREACHABLE();
-  return NULL;
 }
 
 
-LInstruction* LChunkBuilder::DoCheckNonSmi(HCheckNonSmi* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
-}
+LInstruction* LChunkBuilder::DoMul(HMul* instr) {
+  if (instr->representation().IsInteger32()) {
+    ASSERT(instr->left()->representation().IsInteger32());
+    ASSERT(instr->right()->representation().IsInteger32());
 
+    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);
+        LMulConstI* mul = new(zone()) LMulConstI(left, right);
+        if (needs_environment) AssignEnvironment(mul);
+        return DefineAsRegister(mul);
+      }
+    }
 
-LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LInstruction* result = new(zone()) LCheckInstanceType(value);
-  return AssignEnvironment(result);
+    // LMulI can handle all cases, but it requires that a register is allocated
+    // for the second operand.
+    LOperand* right = UseRegisterAtStart(most_const);
+    LMulI* mul = new(zone()) LMulI(left, right);
+    if (needs_environment) AssignEnvironment(mul);
+    return DefineAsRegister(mul);
+  } else if (instr->representation().IsDouble()) {
+    return DoArithmeticD(Token::MUL, instr);
+  } else {
+    return DoArithmeticT(Token::MUL, instr);
+  }
 }
 
 
-LInstruction* LChunkBuilder::DoCheckPrototypeMaps(HCheckPrototypeMaps* instr) {
-  LUnallocated* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LCheckPrototypeMaps* result = new(zone()) LCheckPrototypeMaps(temp1, temp2);
-  return AssignEnvironment(result);
+LInstruction* LChunkBuilder::DoNumericConstraint(HNumericConstraint* instr) {
+  return NULL;
 }
 
 
-LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckFunction(value));
+LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  LInstruction* result = new(zone()) LCheckMaps(value);
-  return AssignEnvironment(result);
+LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
+  LOperand* context = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LOuterContext(context));
 }
 
 
-LInstruction* LChunkBuilder::DoClampToUint8(HClampToUint8* instr) {
-  HValue* value = instr->value();
-  Representation input_rep = value->representation();
-  LOperand* reg = UseRegister(value);
-  if (input_rep.IsDouble()) {
-    // Revisit this decision, here and 8 lines below.
-    return DefineAsRegister(new(zone()) LClampDToUint8(reg, FixedTemp(f22)));
-  } else if (input_rep.IsInteger32()) {
-    return DefineAsRegister(new(zone()) LClampIToUint8(reg));
+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(input_rep.IsSmiOrTagged());
-    // Register allocator doesn't (yet) support allocation of double
-    // temps. Reserve f22 explicitly.
-    LClampTToUint8* result = new(zone()) LClampTToUint8(reg, FixedTemp(f22));
-    return AssignEnvironment(DefineAsRegister(result));
+    ASSERT(info()->IsStub());
+    CodeStubInterfaceDescriptor* descriptor =
+        info()->code_stub()->GetInterfaceDescriptor(info()->isolate());
+    int index = static_cast<int>(instr->index());
+    Register reg = DESCRIPTOR_GET_PARAMETER_REGISTER(descriptor, index);
+    return DefineFixed(result, reg);
   }
 }
 
 
-LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
-  LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
-  return new(zone()) LReturn(UseFixed(instr->value(), v0),
-                             parameter_count);
+LInstruction* LChunkBuilder::DoPower(HPower* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-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.IsTagged()) {
-    return DefineAsRegister(new(zone()) LConstantT);
-  } else {
-    UNREACHABLE();
-    return NULL;
-  }
+LInstruction* LChunkBuilder::DoPushArgument(HPushArgument* instr) {
+  ++argument_count_;
+  LOperand* argument = UseRegister(instr->argument());
+  return new(zone()) LPushArgument(argument);
 }
 
 
-LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
-  LLoadGlobalCell* result = new(zone()) LLoadGlobalCell;
-  return instr->RequiresHoleCheck()
-      ? AssignEnvironment(DefineAsRegister(result))
-      : DefineAsRegister(result);
+LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
-  LOperand* global_object = UseFixed(instr->global_object(), a0);
-  LLoadGlobalGeneric* result = new(zone()) LLoadGlobalGeneric(global_object);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoRegExpLiteral(HRegExpLiteral* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-LInstruction* LChunkBuilder::DoStoreGlobalCell(HStoreGlobalCell* instr) {
-  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::DoReturn(HReturn* instr) {
+  LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
+  return new(zone()) LReturn(UseFixed(instr->value(), x0), parameter_count);
 }
 
 
-LInstruction* LChunkBuilder::DoStoreGlobalGeneric(HStoreGlobalGeneric* instr) {
-  LOperand* global_object = UseFixed(instr->global_object(), a1);
-  LOperand* value = UseFixed(instr->value(), a0);
-  LStoreGlobalGeneric* result =
-      new(zone()) LStoreGlobalGeneric(global_object, value);
-  return MarkAsCall(result, instr);
+LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
+  LOperand* string = UseRegister(instr->string());
+  LOperand* index = UseRegister(instr->index());
+  LOperand* value = UseRegister(instr->value());
+  LOperand* temp = TempRegister();
+  LSeqStringSetChar* result =
+      new(zone()) LSeqStringSetChar(instr->encoding(),
+                                    string, index, value, temp);
+  return DefineAsRegister(result);
 }
 
 
-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::DoShift(Token::Value op,
+                                     HBitwiseBinaryOperation* instr) {
+  if (instr->representation().IsSmiOrTagged()) {
+    return DoArithmeticT(op, instr);
+  }
 
+  ASSERT(instr->representation().IsInteger32());
+  ASSERT(instr->left()->representation().IsInteger32());
+  ASSERT(instr->right()->representation().IsInteger32());
+  LOperand* left = UseRegisterAtStart(instr->left());
 
-LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
-  LOperand* context;
-  LOperand* value;
-  if (instr->NeedsWriteBarrier()) {
-    context = UseTempRegister(instr->context());
-    value = UseTempRegister(instr->value());
+  HValue* right_value = instr->right();
+  LOperand* right = 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 {
-    context = UseRegister(instr->context());
-    value = UseRegister(instr->value());
+    right = UseRegisterAtStart(right_value);
   }
-  LInstruction* result = new(zone()) LStoreContextSlot(context, value);
-  return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
-}
 
+  // 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 {
+      for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
+        if (!it.value()->CheckFlag(HValue::kTruncatingToInt32)) {
+          does_deopt = true;
+          break;
+        }
+      }
+    }
+  }
 
-LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
-  LOperand* obj = UseRegisterAtStart(instr->object());
-  return DefineAsRegister(new(zone()) LLoadNamedField(obj));
+  LInstruction* result =
+      DefineAsRegister(new(zone()) LShiftI(op, left, right, does_deopt));
+  return does_deopt ? AssignEnvironment(result) : result;
 }
 
 
-LInstruction* LChunkBuilder::DoLoadNamedFieldPolymorphic(
-    HLoadNamedFieldPolymorphic* instr) {
-  ASSERT(instr->representation().IsTagged());
-  if (instr->need_generic()) {
-    LOperand* obj = UseFixed(instr->object(), a0);
-    LLoadNamedFieldPolymorphic* result =
-        new(zone()) LLoadNamedFieldPolymorphic(obj);
-    return MarkAsCall(DefineFixed(result, v0), instr);
-  } else {
-    LOperand* obj = UseRegisterAtStart(instr->object());
-    LLoadNamedFieldPolymorphic* result =
-        new(zone()) LLoadNamedFieldPolymorphic(obj);
-    return AssignEnvironment(DefineAsRegister(result));
-  }
+LInstruction* LChunkBuilder::DoRor(HRor* instr) {
+  return DoShift(Token::ROR, instr);
 }
 
 
-LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
-  LOperand* object = UseFixed(instr->object(), a0);
-  LInstruction* result = DefineFixed(new(zone()) LLoadNamedGeneric(object), v0);
-  return MarkAsCall(result, instr);
+LInstruction* LChunkBuilder::DoSar(HSar* instr) {
+  return DoShift(Token::SAR, instr);
 }
 
 
-LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
-    HLoadFunctionPrototype* instr) {
-  return AssignEnvironment(DefineAsRegister(
-      new(zone()) LLoadFunctionPrototype(UseRegister(instr->function()))));
+LInstruction* LChunkBuilder::DoShl(HShl* instr) {
+  return DoShift(Token::SHL, instr);
 }
 
 
-LInstruction* LChunkBuilder::DoLoadExternalArrayPointer(
-    HLoadExternalArrayPointer* instr) {
-  LOperand* input = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LLoadExternalArrayPointer(input));
+LInstruction* LChunkBuilder::DoShr(HShr* instr) {
+  return DoShift(Token::SHR, instr);
 }
 
 
-LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
-  ASSERT(instr->key()->representation().IsInteger32() ||
-         instr->key()->representation().IsSmi());
-  ElementsKind elements_kind = instr->elements_kind();
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
-  LLoadKeyed* result = NULL;
+LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
+  HEnvironment* env = current_block_->last_environment();
+  ASSERT(env != NULL);
 
-  if (!instr->is_external()) {
-    LOperand* obj = NULL;
-    if (instr->representation().IsDouble()) {
-      obj = UseTempRegister(instr->elements());
+  env->set_ast_id(instr->ast_id());
+
+  env->Drop(instr->pop_count());
+  for (int i = instr->values()->length() - 1; i >= 0; --i) {
+    HValue* value = instr->values()->at(i);
+    if (instr->HasAssignedIndexAt(i)) {
+      env->Bind(instr->GetAssignedIndexAt(i), value);
     } else {
-      ASSERT(instr->representation().IsSmiOrTagged());
-      obj = UseRegisterAtStart(instr->elements());
+      env->Push(value);
     }
-    result = new(zone()) LLoadKeyed(obj, key);
-  } else {
-    ASSERT(
-        (instr->representation().IsInteger32() &&
-         (elements_kind != EXTERNAL_FLOAT_ELEMENTS) &&
-         (elements_kind != EXTERNAL_DOUBLE_ELEMENTS)) ||
-        (instr->representation().IsDouble() &&
-         ((elements_kind == EXTERNAL_FLOAT_ELEMENTS) ||
-          (elements_kind == EXTERNAL_DOUBLE_ELEMENTS))));
-    LOperand* external_pointer = UseRegister(instr->elements());
-    result = new(zone()) LLoadKeyed(external_pointer, 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);
-  return can_deoptimize ? AssignEnvironment(result) : result;
+  // 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::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
-  LOperand* object = UseFixed(instr->object(), a1);
-  LOperand* key = UseFixed(instr->key(), a0);
+LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
+  return AssignEnvironment(new(zone()) LDeoptimize);
+}
 
-  LInstruction* result =
-      DefineFixed(new(zone()) LLoadKeyedGeneric(object, key), v0);
-  return MarkAsCall(result, instr);
+
+LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
+  if (instr->is_function_entry()) {
+    return MarkAsCall(new(zone()) LStackCheck, instr);
+  } else {
+    ASSERT(instr->is_backwards_branch());
+    return AssignEnvironment(AssignPointerMap(new(zone()) LStackCheck));
+  }
 }
 
 
-LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
-  ElementsKind elements_kind = instr->elements_kind();
+LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
+  LOperand* temp = TempRegister();
+  LOperand* context;
+  LOperand* value;
+  if (instr->NeedsWriteBarrier()) {
+    // TODO(all): Replace these constraints when RecordWriteStub has been
+    // rewritten. See GOOGJSE-586.
+    context = UseRegisterAndClobber(instr->context());
+    value = UseRegisterAndClobber(instr->value());
+  } else {
+    context = UseRegister(instr->context());
+    value = UseRegister(instr->value());
+  }
+  LInstruction* result = new(zone()) LStoreContextSlot(context, value, temp);
+  return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
+}
+
+
+LInstruction* LChunkBuilder::DoStoreGlobalCell(HStoreGlobalCell* instr) {
+  LOperand* value = UseRegister(instr->value());
+  if (instr->RequiresHoleCheck()) {
+    return AssignEnvironment(new(zone()) LStoreGlobalCell(value,
+                                                          TempRegister(),
+                                                          TempRegister()));
+  } else {
+    return new(zone()) LStoreGlobalCell(value, TempRegister(), NULL);
+  }
+}
+
+
+LInstruction* LChunkBuilder::DoStoreGlobalGeneric(HStoreGlobalGeneric* instr) {
+  LOperand* global_object = UseFixed(instr->global_object(), x1);
+  LOperand* value = UseFixed(instr->value(), x0);
+  LStoreGlobalGeneric* result =
+      new(zone()) LStoreGlobalGeneric(global_object, value);
+  return MarkAsCall(result, instr);
+}
 
-  if (!instr->is_external()) {
-    ASSERT(instr->elements()->representation().IsTagged());
-    bool needs_write_barrier = instr->NeedsWriteBarrier();
-    LOperand* object = NULL;
-    LOperand* val = NULL;
-    LOperand* key = NULL;
-
-    if (instr->value()->representation().IsDouble()) {
-      object = UseRegisterAtStart(instr->elements());
-      key = UseRegisterOrConstantAtStart(instr->key());
-      val = UseTempRegister(instr->value());
-    } else {
-      ASSERT(instr->value()->representation().IsSmiOrTagged());
-      object = UseTempRegister(instr->elements());
-      val = needs_write_barrier ? UseTempRegister(instr->value())
-          : UseRegisterAtStart(instr->value());
-      key = needs_write_barrier ? UseTempRegister(instr->key())
-          : UseRegisterOrConstantAtStart(instr->key());
-    }
 
-    return new(zone()) LStoreKeyed(object, key, val);
+LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
+  LOperand* temp = NULL;
+  LOperand* elements = NULL;
+  LOperand* val = NULL;
+  LOperand* key = NULL;
+
+  if (!instr->is_external() && 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());
   }
 
-  ASSERT(
-      (instr->value()->representation().IsInteger32() &&
-       (elements_kind != EXTERNAL_FLOAT_ELEMENTS) &&
-       (elements_kind != EXTERNAL_DOUBLE_ELEMENTS)) ||
-      (instr->value()->representation().IsDouble() &&
-       ((elements_kind == EXTERNAL_FLOAT_ELEMENTS) ||
-        (elements_kind == EXTERNAL_DOUBLE_ELEMENTS))));
-  ASSERT(instr->elements()->representation().IsExternal());
-  bool val_is_temp_register =
-      elements_kind == EXTERNAL_PIXEL_ELEMENTS ||
-      elements_kind == EXTERNAL_FLOAT_ELEMENTS;
-  LOperand* val = val_is_temp_register ? UseTempRegister(instr->value())
-      : UseRegister(instr->value());
-  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
-  LOperand* external_pointer = UseRegister(instr->elements());
+  if (instr->is_external()) {
+    ASSERT(instr->elements()->representation().IsExternal());
+    ASSERT((instr->value()->representation().IsInteger32() &&
+            (instr->elements_kind() != EXTERNAL_FLOAT_ELEMENTS) &&
+            (instr->elements_kind() != EXTERNAL_DOUBLE_ELEMENTS)) ||
+           (instr->value()->representation().IsDouble() &&
+            ((instr->elements_kind() == EXTERNAL_FLOAT_ELEMENTS) ||
+             (instr->elements_kind() == EXTERNAL_DOUBLE_ELEMENTS))));
+    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());
+
+    // 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());
 
-  return new(zone()) LStoreKeyed(external_pointer, key, val);
+    temp = TempRegister();
+    return new(zone()) LStoreKeyedFixed(elements, key, val, temp);
+  }
 }
 
 
 LInstruction* LChunkBuilder::DoStoreKeyedGeneric(HStoreKeyedGeneric* instr) {
-  LOperand* obj = UseFixed(instr->object(), a2);
-  LOperand* key = UseFixed(instr->key(), a1);
-  LOperand* val = UseFixed(instr->value(), a0);
+  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(obj, key, val), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoTransitionElementsKind(
-    HTransitionElementsKind* instr) {
-  LOperand* object = UseRegister(instr->object());
-  if (IsSimpleMapChangeTransition(instr->from_kind(), instr->to_kind())) {
-    LOperand* new_map_reg = TempRegister();
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, new_map_reg, NULL);
-    return result;
-  } else if (FLAG_compiled_transitions) {
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object, NULL, NULL);
-    return AssignPointerMap(result);
-  } else {
-    LOperand* object = UseFixed(instr->object(), a0);
-    LOperand* fixed_object_reg = FixedTemp(a2);
-    LOperand* new_map_reg = FixedTemp(a3);
-    LTransitionElementsKind* result =
-        new(zone()) LTransitionElementsKind(object,
-                                            new_map_reg,
-                                            fixed_object_reg);
-    return MarkAsCall(result, instr);
-  }
-}
-
-
-LInstruction* LChunkBuilder::DoTrapAllocationMemento(
-    HTrapAllocationMemento* instr) {
-  LOperand* object = UseRegister(instr->object());
-  LOperand* temp = TempRegister();
-  LTrapAllocationMemento* result =
-      new(zone()) LTrapAllocationMemento(object, temp);
-  return AssignEnvironment(result);
+  return MarkAsCall(new(zone()) LStoreKeyedGeneric(object, key, value), instr);
 }
 
 
 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->transition().is_null() &&
-      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());
-  }
+  // 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.
 
-  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());
-  }
+  // 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.
 
-  // We need a temporary register for write barrier of the map field.
-  LOperand* temp = needs_write_barrier_for_map ? TempRegister() : NULL;
+  LOperand* object = UseRegister(instr->object());
+  LOperand* value = UseRegisterAndClobber(instr->value());
+  LOperand* temp0 = TempRegister();
+  LOperand* temp1 = TempRegister();
 
-  LStoreNamedField* result = new(zone()) LStoreNamedField(obj, val, temp);
+  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* obj = UseFixed(instr->object(), a1);
-  LOperand* val = UseFixed(instr->value(), a0);
-
-  LInstruction* result = new(zone()) LStoreNamedGeneric(obj, val);
+  LOperand* object = UseFixed(instr->object(), x1);
+  LOperand* value = UseFixed(instr->value(), x0);
+  LInstruction* result = new(zone()) LStoreNamedGeneric(object, value);
   return MarkAsCall(result, instr);
 }
 
@@ -2253,245 +2088,278 @@ LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
 LInstruction* LChunkBuilder::DoStringAdd(HStringAdd* instr) {
   LOperand* left = UseRegisterAtStart(instr->left());
   LOperand* right = UseRegisterAtStart(instr->right());
-  return MarkAsCall(DefineFixed(new(zone()) LStringAdd(left, right), v0),
-                    instr);
+
+  LStringAdd* result = new(zone()) LStringAdd(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());
   LStringCharCodeAt* result = new(zone()) LStringCharCodeAt(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());
   LStringCharFromCode* result = new(zone()) LStringCharFromCode(char_code);
   return AssignPointerMap(DefineAsRegister(result));
 }
 
 
-LInstruction* LChunkBuilder::DoStringLength(HStringLength* instr) {
-  LOperand* string = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LStringLength(string));
-}
-
-
-LInstruction* LChunkBuilder::DoAllocate(HAllocate* instr) {
-  info()->MarkAsDeferredCalling();
-  LOperand* size = instr->size()->IsConstant()
-      ? UseConstant(instr->size())
-      : UseTempRegister(instr->size());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LAllocate* result = new(zone()) LAllocate(size, temp1, temp2);
-  return AssignPointerMap(DefineAsRegister(result));
-}
-
-
-LInstruction* LChunkBuilder::DoRegExpLiteral(HRegExpLiteral* instr) {
-  return MarkAsCall(DefineFixed(new(zone()) LRegExpLiteral, v0), instr);
-}
-
-
-LInstruction* LChunkBuilder::DoFunctionLiteral(HFunctionLiteral* instr) {
-  return MarkAsCall(DefineFixed(new(zone()) LFunctionLiteral, v0), instr);
+LInstruction* LChunkBuilder::DoStringCompareAndBranch(
+    HStringCompareAndBranch* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-LInstruction* LChunkBuilder::DoDeleteProperty(HDeleteProperty* instr) {
-  LOperand* object = UseFixed(instr->object(), a0);
-  LOperand* key = UseFixed(instr->key(), a1);
-  LDeleteProperty* result = new(zone()) LDeleteProperty(object, key);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoStringLength(HStringLength* instr) {
+  // TODO(all): This instruction doesn't exist anymore on bleeding_edge.
+  LOperand* string = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new(zone()) LStringLength(string));
 }
 
 
-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::DoSub(HSub* instr) {
+  if (instr->representation().IsInteger32()) {
+    ASSERT(instr->left()->representation().IsInteger32());
+    ASSERT(instr->right()->representation().IsInteger32());
 
-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);
+    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());
+    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()) {
+    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_GET_PARAMETER_REGISTER(descriptor, index);
-    return DefineFixed(result, reg);
+    return DoArithmeticT(Token::SUB, instr);
   }
 }
 
 
-LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
-  int spill_index = chunk()->GetNextSpillIndex(false);  // Not double-width.
-  if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
-    Abort("Too many spill slots needed for OSR");
-    spill_index = 0;
+LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
+  if (instr->HasNoUses()) {
+    return NULL;
+  } else {
+    return DefineAsRegister(new(zone()) LThisFunction);
   }
-  return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
 }
 
 
-LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
-  argument_count_ -= instr->argument_count();
-  return MarkAsCall(DefineFixed(new(zone()) LCallStub, v0), instr);
+LInstruction* LChunkBuilder::DoThrow(HThrow* instr) {
+  // TODO(all): This should not need to be a fixed register, as it's pushed to
+  // the stack in DoThrow. However, we hit an assertion if it's assigned a non-
+  // fixed register.
+  LOperand* value = UseFixed(instr->value(), x0);
+  return MarkAsCall(new(zone()) LThrow(value), 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::DoToFastProperties(HToFastProperties* instr) {
+  LOperand* object = UseFixed(instr->value(), x0);
+  LToFastProperties* result = new(zone()) LToFastProperties(object);
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
-  info()->MarkAsRequiresFrame();
-  LOperand* args = UseRegister(instr->arguments());
-  LOperand* length;
-  LOperand* index;
-  if (instr->length()->IsConstant() && instr->index()->IsConstant()) {
-    length = UseRegisterOrConstant(instr->length());
-    index = UseOrConstant(instr->index());
+LInstruction* LChunkBuilder::DoTransitionElementsKind(
+    HTransitionElementsKind* instr) {
+  if (IsSimpleMapChangeTransition(instr->from_kind(), instr->to_kind())) {
+    LOperand* object = UseRegister(instr->object());
+    LTransitionElementsKind* result =
+        new(zone()) LTransitionElementsKind(object, TempRegister(),
+                                            TempRegister());
+    return result;
+  } else if (FLAG_compiled_transitions) {
+    LOperand* object = UseRegister(instr->object());
+    LTransitionElementsKind* result =
+        new(zone()) LTransitionElementsKind(object, NULL, NULL);
+    return AssignPointerMap(result);
   } else {
-    length = UseTempRegister(instr->length());
-    index = UseRegisterAtStart(instr->index());
+    LOperand* object = UseFixed(instr->object(), x0);
+    LTransitionElementsKind* result =
+        new(zone()) LTransitionElementsKind(object, NULL, NULL);
+    return MarkAsCall(result, instr);
   }
-  return DefineAsRegister(new(zone()) LAccessArgumentsAt(args, length, index));
 }
 
 
-LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
-  LOperand* object = UseFixed(instr->value(), a0);
-  LToFastProperties* result = new(zone()) LToFastProperties(object);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoTrapAllocationMemento(
+    HTrapAllocationMemento* instr) {
+  LOperand* object = UseRegister(instr->object());
+  LOperand* temp1 = TempRegister();
+  LOperand* temp2 = TempRegister();
+  LTrapAllocationMemento* result =
+      new(zone()) LTrapAllocationMemento(object, temp1, temp2);
+  return AssignEnvironment(result);
 }
 
 
 LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
-  LTypeof* result = new(zone()) LTypeof(UseFixed(instr->value(), a0));
-  return MarkAsCall(DefineFixed(result, v0), 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(UseRegisterAtStart(instr->value()));
+  return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoTypeofIsAndBranch(HTypeofIsAndBranch* instr) {
-  return new(zone()) LTypeofIsAndBranch(UseTempRegister(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();
 
-LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
-    HIsConstructCallAndBranch* instr) {
-  return new(zone()) LIsConstructCallAndBranch(TempRegister());
+  return new(zone()) LTypeofIsAndBranch(
+      UseRegister(instr->value()), temp1, temp2);
 }
 
 
-LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
-  HEnvironment* env = current_block_->last_environment();
-  ASSERT(env != NULL);
-
-  env->set_ast_id(instr->ast_id());
-
-  env->Drop(instr->pop_count());
-  for (int i = instr->values()->length() - 1; i >= 0; --i) {
-    HValue* value = instr->values()->at(i);
-    if (instr->HasAssignedIndexAt(i)) {
-      env->Bind(instr->GetAssignedIndexAt(i), value);
-    } else {
-      env->Push(value);
+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* input = UseRegister(instr->value());
+        LOperand* temp1 = TempRegister();
+        LOperand* temp2 = TempRegister();
+        LOperand* temp3 = TempRegister();
+        LMathAbsTagged* result =
+            new(zone()) LMathAbsTagged(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());
+          // The Integer32 case needs an environment because it can deoptimize
+          // on INT_MIN.
+          return AssignEnvironment(DefineAsRegister(result));
+        }
+      }
     }
+    case kMathCos: {
+      ASSERT(instr->representation().IsDouble());
+      ASSERT(instr->value()->representation().IsDouble());
+      LOperand* input = UseFixedDouble(instr->value(), d0);
+      LMathCos* result = new(zone()) LMathCos(input);
+      return MarkAsCall(DefineFixedDouble(result, d0), instr);
+    }
+    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 kMathSin: {
+      ASSERT(instr->representation().IsDouble());
+      ASSERT(instr->value()->representation().IsDouble());
+      LOperand* input = UseFixedDouble(instr->value(), d0);
+      LMathSin* result = new(zone()) LMathSin(input);
+      return MarkAsCall(DefineFixedDouble(result, d0), instr);
+    }
+    case kMathSqrt: {
+      ASSERT(instr->representation().IsDouble());
+      ASSERT(instr->value()->representation().IsDouble());
+      LOperand* input = UseRegisterAtStart(instr->value());
+      return DefineAsRegister(new(zone()) LMathSqrt(input));
+    }
+    case kMathTan: {
+      ASSERT(instr->representation().IsDouble());
+      ASSERT(instr->value()->representation().IsDouble());
+      LOperand* input = UseFixedDouble(instr->value(), d0);
+      LMathTan* result = new(zone()) LMathTan(input);
+      return MarkAsCall(DefineFixedDouble(result, d0), instr);
+    }
+    default:
+      UNREACHABLE();
+      return NULL;
   }
-
-  // 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()) {
-    return MarkAsCall(new(zone()) LStackCheck, instr);
-  } else {
-    ASSERT(instr->is_backwards_branch());
-    return AssignEnvironment(AssignPointerMap(new(zone()) LStackCheck));
-  }
+LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
+  UNIMPLEMENTED_INSTRUCTION();
 }
 
 
-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(),
-                                               instr->undefined_receiver());
-  if (instr->arguments_var() != NULL) {
-    inner->Bind(instr->arguments_var(), graph()->GetArgumentsObject());
-  }
-  inner->set_entry(instr);
-  current_block_->UpdateEnvironment(inner);
-  chunk_->AddInlinedClosure(instr->closure());
+LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
   return NULL;
 }
 
 
-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);
-    argument_count_ -= argument_count;
-  }
-
-  HEnvironment* outer = current_block_->last_environment()->
-      DiscardInlined(false);
-  current_block_->UpdateEnvironment(outer);
-
-  return pop;
-}
-
-
-LInstruction* LChunkBuilder::DoIn(HIn* instr) {
-  LOperand* key = UseRegisterAtStart(instr->key());
-  LOperand* object = UseRegisterAtStart(instr->object());
-  LIn* result = new(zone()) LIn(key, object);
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
+  LOperand* object = UseRegister(instr->value());
+  LValueOf* result = new(zone()) LValueOf(object, TempRegister());
+  return DefineSameAsFirst(result);
 }
 
 
 LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
-  LOperand* object = UseFixed(instr->enumerable(), a0);
+  // Assign object to a fixed register different from those already used in
+  // LForInPrepareMap.
+  LOperand* object = UseFixed(instr->enumerable(), x0);
   LForInPrepareMap* result = new(zone()) LForInPrepareMap(object);
-  return MarkAsCall(DefineFixed(result, v0), instr, CAN_DEOPTIMIZE_EAGERLY);
+  return MarkAsCall(DefineFixed(result, x0), instr, CAN_DEOPTIMIZE_EAGERLY);
 }
 
 
@@ -2503,16 +2371,26 @@ LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
 
 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 = UseRegisterAtStart(instr->function());
+  LOperand* temp = TempRegister();
+  LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function, temp);
+  return AssignEnvironment(DefineAsRegister(result));
+}
+
+
 } }  // namespace v8::internal