MIPS: crankshaft implementation

src/mips/lithium-codegen-mips.cc

+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "mips/lithium-codegen-mips.h"
+#include "mips/lithium-gap-resolver-mips.h"
+#include "code-stubs.h"
+#include "stub-cache.h"
+
+namespace v8 {
+namespace internal {
+
+
+class SafepointGenerator : public CallWrapper {
+ public:
+  SafepointGenerator(LCodeGen* codegen,
+                     LPointerMap* pointers,
+                     int deoptimization_index)
+      : codegen_(codegen),
+        pointers_(pointers),
+        deoptimization_index_(deoptimization_index) { }
+  virtual ~SafepointGenerator() { }
+
+  virtual void BeforeCall(int call_size) const {
+    ASSERT(call_size >= 0);
+    // Ensure that we have enough space after the previous safepoint position
+    // for the generated code there.
+    int call_end = codegen_->masm()->pc_offset() + call_size;
+    int prev_jump_end =
+        codegen_->LastSafepointEnd() + Deoptimizer::patch_size();
+    if (call_end < prev_jump_end) {
+      int padding_size = prev_jump_end - call_end;
+      ASSERT_EQ(0, padding_size % Assembler::kInstrSize);
+      while (padding_size > 0) {
+        codegen_->masm()->nop();
+        padding_size -= Assembler::kInstrSize;
+      }
+    }
+  }
+
+  virtual void AfterCall() const {
+    codegen_->RecordSafepoint(pointers_, deoptimization_index_);
+  }
+
+ private:
+  LCodeGen* codegen_;
+  LPointerMap* pointers_;
+  int deoptimization_index_;
+};
+
+
+#define __ masm()->
+
+bool LCodeGen::GenerateCode() {
+  HPhase phase("Code generation", chunk());
+  ASSERT(is_unused());
+  status_ = GENERATING;
+  CpuFeatures::Scope scope(FPU);
+
+  CodeStub::GenerateFPStubs();
+
+  // Open a frame scope to indicate that there is a frame on the stack.  The
+  // NONE indicates that the scope shouldn't actually generate code to set up
+  // the frame (that is done in GeneratePrologue).
+  FrameScope frame_scope(masm_, StackFrame::NONE);
+
+  return GeneratePrologue() &&
+      GenerateBody() &&
+      GenerateDeferredCode() &&
+      GenerateSafepointTable();
+}
+
+
+void LCodeGen::FinishCode(Handle<Code> code) {
+  ASSERT(is_done());
+  code->set_stack_slots(GetStackSlotCount());
+  code->set_safepoint_table_offset(safepoints_.GetCodeOffset());
+  PopulateDeoptimizationData(code);
+  Deoptimizer::EnsureRelocSpaceForLazyDeoptimization(code);
+}
+
+
+void LCodeGen::Abort(const char* format, ...) {
+  if (FLAG_trace_bailout) {
+    SmartArrayPointer<char> name(
+        info()->shared_info()->DebugName()->ToCString());
+    PrintF("Aborting LCodeGen in @\"%s\": ", *name);
+    va_list arguments;
+    va_start(arguments, format);
+    OS::VPrint(format, arguments);
+    va_end(arguments);
+    PrintF("\n");
+  }
+  status_ = ABORTED;
+}
+
+
+void LCodeGen::Comment(const char* format, ...) {
+  if (!FLAG_code_comments) return;
+  char buffer[4 * KB];
+  StringBuilder builder(buffer, ARRAY_SIZE(buffer));
+  va_list arguments;
+  va_start(arguments, format);
+  builder.AddFormattedList(format, arguments);
+  va_end(arguments);
+
+  // Copy the string before recording it in the assembler to avoid
+  // issues when the stack allocated buffer goes out of scope.
+  size_t length = builder.position();
+  Vector<char> copy = Vector<char>::New(length + 1);
+  memcpy(copy.start(), builder.Finalize(), copy.length());
+  masm()->RecordComment(copy.start());
+}
+
+
+bool LCodeGen::GeneratePrologue() {
+  ASSERT(is_generating());
+
+#ifdef DEBUG
+  if (strlen(FLAG_stop_at) > 0 &&
+      info_->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
+    __ stop("stop_at");
+  }
+#endif
+
+  // a1: Callee's JS function.
+  // cp: Callee's context.
+  // fp: Caller's frame pointer.
+  // lr: Caller's pc.
+
+  // Strict mode functions and builtins need to replace the receiver
+  // with undefined when called as functions (without an explicit
+  // receiver object). r5 is zero for method calls and non-zero for
+  // function calls.
+  if (info_->is_strict_mode() || info_->is_native()) {
+    Label ok;
+    __ Branch(&ok, eq, t1, Operand(zero_reg));
+
+    int receiver_offset = scope()->num_parameters() * kPointerSize;
+    __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
+    __ sw(a2, MemOperand(sp, receiver_offset));
+    __ bind(&ok);
+  }
+
+  __ Push(ra, fp, cp, a1);
+  __ Addu(fp, sp, Operand(2 * kPointerSize));  // Adj. FP to point to saved FP.
+
+  // Reserve space for the stack slots needed by the code.
+  int slots = GetStackSlotCount();
+  if (slots > 0) {
+    if (FLAG_debug_code) {
+      __ li(a0, Operand(slots));
+      __ li(a2, Operand(kSlotsZapValue));
+      Label loop;
+      __ bind(&loop);
+      __ push(a2);
+      __ Subu(a0, a0, 1);
+      __ Branch(&loop, ne, a0, Operand(zero_reg));
+    } else {
+      __ Subu(sp, sp, Operand(slots * kPointerSize));
+    }
+  }
+
+  // Possibly allocate a local context.
+  int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
+  if (heap_slots > 0) {
+    Comment(";;; Allocate local context");
+    // Argument to NewContext is the function, which is in a1.
+    __ push(a1);
+    if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+      FastNewContextStub stub(heap_slots);
+      __ CallStub(&stub);
+    } else {
+      __ CallRuntime(Runtime::kNewFunctionContext, 1);
+    }
+    RecordSafepoint(Safepoint::kNoDeoptimizationIndex);
+    // Context is returned in both v0 and cp.  It replaces the context
+    // passed to us.  It's saved in the stack and kept live in cp.
+    __ sw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+    // Copy any necessary parameters into the context.
+    int num_parameters = scope()->num_parameters();
+    for (int i = 0; i < num_parameters; i++) {
+      Variable* var = scope()->parameter(i);
+      if (var->IsContextSlot()) {
+        int parameter_offset = StandardFrameConstants::kCallerSPOffset +
+            (num_parameters - 1 - i) * kPointerSize;
+        // Load parameter from stack.
+        __ lw(a0, MemOperand(fp, parameter_offset));
+        // Store it in the context.
+        MemOperand target = ContextOperand(cp, var->index());
+        __ sw(a0, target);
+        // Update the write barrier. This clobbers a3 and a0.
+        __ RecordWriteContextSlot(
+            cp, target.offset(), a0, a3, kRAHasBeenSaved, kSaveFPRegs);
+      }
+    }
+    Comment(";;; End allocate local context");
+  }
+
+  // Trace the call.
+  if (FLAG_trace) {
+    __ CallRuntime(Runtime::kTraceEnter, 0);
+  }
+  return !is_aborted();
+}
+
+
+bool LCodeGen::GenerateBody() {
+  ASSERT(is_generating());
+  bool emit_instructions = true;
+  for (current_instruction_ = 0;
+       !is_aborted() && current_instruction_ < instructions_->length();
+       current_instruction_++) {
+    LInstruction* instr = instructions_->at(current_instruction_);
+    if (instr->IsLabel()) {
+      LLabel* label = LLabel::cast(instr);
+      emit_instructions = !label->HasReplacement();
+    }
+
+    if (emit_instructions) {
+      Comment(";;; @%d: %s.", current_instruction_, instr->Mnemonic());
+      instr->CompileToNative(this);
+    }
+  }
+  return !is_aborted();
+}
+
+
+LInstruction* LCodeGen::GetNextInstruction() {
+  if (current_instruction_ < instructions_->length() - 1) {
+    return instructions_->at(current_instruction_ + 1);
+  } else {
+    return NULL;
+  }
+}
+
+
+bool LCodeGen::GenerateDeferredCode() {
+  ASSERT(is_generating());
+  if (deferred_.length() > 0) {
+    for (int i = 0; !is_aborted() && i < deferred_.length(); i++) {
+      LDeferredCode* code = deferred_[i];
+      __ bind(code->entry());
+      Comment(";;; Deferred code @%d: %s.",
+              code->instruction_index(),
+              code->instr()->Mnemonic());
+      code->Generate();
+      __ jmp(code->exit());
+    }
+
+    // Pad code to ensure that the last piece of deferred code have
+    // room for lazy bailout.
+    while ((masm()->pc_offset() - LastSafepointEnd())
+           < Deoptimizer::patch_size()) {
+      __ nop();
+    }
+  }
+  // Deferred code is the last part of the instruction sequence. Mark
+  // the generated code as done unless we bailed out.
+  if (!is_aborted()) status_ = DONE;
+  return !is_aborted();
+}
+
+
+bool LCodeGen::GenerateDeoptJumpTable() {
+  // TODO(plind): not clear that this will have advantage for MIPS.
+  // Skipping it for now. Raised issue #100 for this.
+  Abort("Unimplemented: %s", "GenerateDeoptJumpTable");
+  return false;
+}
+
+
+bool LCodeGen::GenerateSafepointTable() {
+  ASSERT(is_done());
+  safepoints_.Emit(masm(), GetStackSlotCount());
+  return !is_aborted();
+}
+
+
+Register LCodeGen::ToRegister(int index) const {
+  return Register::FromAllocationIndex(index);
+}
+
+
+DoubleRegister LCodeGen::ToDoubleRegister(int index) const {
+  return DoubleRegister::FromAllocationIndex(index);
+}
+
+
+Register LCodeGen::ToRegister(LOperand* op) const {
+  ASSERT(op->IsRegister());
+  return ToRegister(op->index());
+}
+
+
+Register LCodeGen::EmitLoadRegister(LOperand* op, Register scratch) {
+  if (op->IsRegister()) {
+    return ToRegister(op->index());
+  } else if (op->IsConstantOperand()) {
+    __ li(scratch, ToOperand(op));
+    return scratch;
+  } else if (op->IsStackSlot() || op->IsArgument()) {
+    __ lw(scratch, ToMemOperand(op));
+    return scratch;
+  }
+  UNREACHABLE();
+  return scratch;
+}
+
+
+DoubleRegister LCodeGen::ToDoubleRegister(LOperand* op) const {
+  ASSERT(op->IsDoubleRegister());
+  return ToDoubleRegister(op->index());
+}
+
+
+DoubleRegister LCodeGen::EmitLoadDoubleRegister(LOperand* op,
+                                                FloatRegister flt_scratch,
+                                                DoubleRegister dbl_scratch) {
+  if (op->IsDoubleRegister()) {
+    return ToDoubleRegister(op->index());
+  } else if (op->IsConstantOperand()) {
+    LConstantOperand* const_op = LConstantOperand::cast(op);
+    Handle<Object> literal = chunk_->LookupLiteral(const_op);
+    Representation r = chunk_->LookupLiteralRepresentation(const_op);
+    if (r.IsInteger32()) {
+      ASSERT(literal->IsNumber());
+      __ li(at, Operand(static_cast<int32_t>(literal->Number())));
+      __ mtc1(at, flt_scratch);
+      __ cvt_d_w(dbl_scratch, flt_scratch);
+      return dbl_scratch;
+    } else if (r.IsDouble()) {
+      Abort("unsupported double immediate");
+    } else if (r.IsTagged()) {
+      Abort("unsupported tagged immediate");
+    }
+  } else if (op->IsStackSlot() || op->IsArgument()) {
+    MemOperand mem_op = ToMemOperand(op);
+    __ ldc1(dbl_scratch, mem_op);
+    return dbl_scratch;
+  }
+  UNREACHABLE();
+  return dbl_scratch;
+}
+
+
+int LCodeGen::ToInteger32(LConstantOperand* op) const {
+  Handle<Object> value = chunk_->LookupLiteral(op);
+  ASSERT(chunk_->LookupLiteralRepresentation(op).IsInteger32());
+  ASSERT(static_cast<double>(static_cast<int32_t>(value->Number())) ==
+      value->Number());
+  return static_cast<int32_t>(value->Number());
+}
+
+
+Operand LCodeGen::ToOperand(LOperand* op) {
+  if (op->IsConstantOperand()) {
+    LConstantOperand* const_op = LConstantOperand::cast(op);
+    Handle<Object> literal = chunk_->LookupLiteral(const_op);
+    Representation r = chunk_->LookupLiteralRepresentation(const_op);
+    if (r.IsInteger32()) {
+      ASSERT(literal->IsNumber());
+      return Operand(static_cast<int32_t>(literal->Number()));
+    } else if (r.IsDouble()) {
+      Abort("ToOperand Unsupported double immediate.");
+    }
+    ASSERT(r.IsTagged());
+    return Operand(literal);
+  } else if (op->IsRegister()) {
+    return Operand(ToRegister(op));
+  } else if (op->IsDoubleRegister()) {
+    Abort("ToOperand IsDoubleRegister unimplemented");
+    return Operand(0);
+  }
+  // Stack slots not implemented, use ToMemOperand instead.
+  UNREACHABLE();
+  return Operand(0);
+}
+
+
+MemOperand LCodeGen::ToMemOperand(LOperand* op) const {
+  ASSERT(!op->IsRegister());
+  ASSERT(!op->IsDoubleRegister());
+  ASSERT(op->IsStackSlot() || op->IsDoubleStackSlot());
+  int index = op->index();
+  if (index >= 0) {
+    // Local or spill slot. Skip the frame pointer, function, and
+    // context in the fixed part of the frame.
+    return MemOperand(fp, -(index + 3) * kPointerSize);
+  } else {
+    // Incoming parameter. Skip the return address.
+    return MemOperand(fp, -(index - 1) * kPointerSize);
+  }
+}
+
+
+MemOperand LCodeGen::ToHighMemOperand(LOperand* op) const {
+  ASSERT(op->IsDoubleStackSlot());
+  int index = op->index();
+  if (index >= 0) {
+    // Local or spill slot. Skip the frame pointer, function, context,
+    // and the first word of the double in the fixed part of the frame.
+    return MemOperand(fp, -(index + 3) * kPointerSize + kPointerSize);
+  } else {
+    // Incoming parameter. Skip the return address and the first word of
+    // the double.
+    return MemOperand(fp, -(index - 1) * kPointerSize + kPointerSize);
+  }
+}
+
+
+void LCodeGen::WriteTranslation(LEnvironment* environment,
+                                Translation* translation) {
+  if (environment == NULL) return;
+
+  // The translation includes one command per value in the environment.
+  int translation_size = environment->values()->length();
+  // The output frame height does not include the parameters.
+  int height = translation_size - environment->parameter_count();
+
+  WriteTranslation(environment->outer(), translation);
+  int closure_id = DefineDeoptimizationLiteral(environment->closure());
+  translation->BeginFrame(environment->ast_id(), closure_id, height);
+  for (int i = 0; i < translation_size; ++i) {
+    LOperand* value = environment->values()->at(i);
+    // spilled_registers_ and spilled_double_registers_ are either
+    // both NULL or both set.
+    if (environment->spilled_registers() != NULL && value != NULL) {
+      if (value->IsRegister() &&
+          environment->spilled_registers()[value->index()] != NULL) {
+        translation->MarkDuplicate();
+        AddToTranslation(translation,
+                         environment->spilled_registers()[value->index()],
+                         environment->HasTaggedValueAt(i));
+      } else if (
+          value->IsDoubleRegister() &&
+          environment->spilled_double_registers()[value->index()] != NULL) {
+        translation->MarkDuplicate();
+        AddToTranslation(
+            translation,
+            environment->spilled_double_registers()[value->index()],
+            false);
+      }
+    }
+
+    AddToTranslation(translation, value, environment->HasTaggedValueAt(i));
+  }
+}
+
+
+void LCodeGen::AddToTranslation(Translation* translation,
+                                LOperand* op,
+                                bool is_tagged) {
+  if (op == NULL) {
+    // TODO(twuerthinger): Introduce marker operands to indicate that this value
+    // is not present and must be reconstructed from the deoptimizer. Currently
+    // this is only used for the arguments object.
+    translation->StoreArgumentsObject();
+  } else if (op->IsStackSlot()) {
+    if (is_tagged) {
+      translation->StoreStackSlot(op->index());
+    } else {
+      translation->StoreInt32StackSlot(op->index());
+    }
+  } else if (op->IsDoubleStackSlot()) {
+    translation->StoreDoubleStackSlot(op->index());
+  } else if (op->IsArgument()) {
+    ASSERT(is_tagged);
+    int src_index = GetStackSlotCount() + op->index();
+    translation->StoreStackSlot(src_index);
+  } else if (op->IsRegister()) {
+    Register reg = ToRegister(op);
+    if (is_tagged) {
+      translation->StoreRegister(reg);
+    } else {
+      translation->StoreInt32Register(reg);
+    }
+  } else if (op->IsDoubleRegister()) {
+    DoubleRegister reg = ToDoubleRegister(op);
+    translation->StoreDoubleRegister(reg);
+  } else if (op->IsConstantOperand()) {
+    Handle<Object> literal = chunk()->LookupLiteral(LConstantOperand::cast(op));
+    int src_index = DefineDeoptimizationLiteral(literal);
+    translation->StoreLiteral(src_index);
+  } else {
+    UNREACHABLE();
+  }
+}
+
+
+void LCodeGen::CallCode(Handle<Code> code,
+                        RelocInfo::Mode mode,
+                        LInstruction* instr) {
+  CallCodeGeneric(code, mode, instr, RECORD_SIMPLE_SAFEPOINT);
+}
+
+
+void LCodeGen::CallCodeGeneric(Handle<Code> code,
+                               RelocInfo::Mode mode,
+                               LInstruction* instr,
+                               SafepointMode safepoint_mode) {
+  ASSERT(instr != NULL);
+  LPointerMap* pointers = instr->pointer_map();
+  RecordPosition(pointers->position());
+  __ Call(code, mode);
+  RegisterLazyDeoptimization(instr, safepoint_mode);
+}
+
+
+void LCodeGen::CallRuntime(const Runtime::Function* function,
+                           int num_arguments,
+                           LInstruction* instr) {
+  ASSERT(instr != NULL);
+  LPointerMap* pointers = instr->pointer_map();
+  ASSERT(pointers != NULL);
+  RecordPosition(pointers->position());
+
+  __ CallRuntime(function, num_arguments);
+  RegisterLazyDeoptimization(instr, RECORD_SIMPLE_SAFEPOINT);
+}
+
+
+void LCodeGen::CallRuntimeFromDeferred(Runtime::FunctionId id,
+                                       int argc,
+                                       LInstruction* instr) {
+  __ CallRuntimeSaveDoubles(id);
+  RecordSafepointWithRegisters(
+      instr->pointer_map(), argc, Safepoint::kNoDeoptimizationIndex);
+}
+
+
+void LCodeGen::RegisterLazyDeoptimization(LInstruction* instr,
+                                          SafepointMode safepoint_mode) {
+  // Create the environment to bailout to. If the call has side effects
+  // execution has to continue after the call otherwise execution can continue
+  // from a previous bailout point repeating the call.
+  LEnvironment* deoptimization_environment;
+  if (instr->HasDeoptimizationEnvironment()) {
+    deoptimization_environment = instr->deoptimization_environment();
+  } else {
+    deoptimization_environment = instr->environment();
+  }
+
+  RegisterEnvironmentForDeoptimization(deoptimization_environment);
+  if (safepoint_mode == RECORD_SIMPLE_SAFEPOINT) {
+    RecordSafepoint(instr->pointer_map(),
+                    deoptimization_environment->deoptimization_index());
+  } else {
+    ASSERT(safepoint_mode == RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
+    RecordSafepointWithRegisters(
+        instr->pointer_map(),
+        0,
+        deoptimization_environment->deoptimization_index());
+  }
+}
+
+
+void LCodeGen::RegisterEnvironmentForDeoptimization(LEnvironment* environment) {
+  if (!environment->HasBeenRegistered()) {
+    // Physical stack frame layout:
+    // -x ............. -4  0 ..................................... y
+    // [incoming arguments] [spill slots] [pushed outgoing arguments]
+
+    // Layout of the environment:
+    // 0 ..................................................... size-1
+    // [parameters] [locals] [expression stack including arguments]
+
+    // Layout of the translation:
+    // 0 ........................................................ size - 1 + 4
+    // [expression stack including arguments] [locals] [4 words] [parameters]
+    // |>------------  translation_size ------------<|
+
+    int frame_count = 0;
+    for (LEnvironment* e = environment; e != NULL; e = e->outer()) {
+      ++frame_count;
+    }
+    Translation translation(&translations_, frame_count);
+    WriteTranslation(environment, &translation);
+    int deoptimization_index = deoptimizations_.length();
+    environment->Register(deoptimization_index, translation.index());
+    deoptimizations_.Add(environment);
+  }
+}
+
+
+void LCodeGen::DeoptimizeIf(Condition cc,
+                            LEnvironment* environment,
+                            Register src1,
+                            const Operand& src2) {
+  RegisterEnvironmentForDeoptimization(environment);
+  ASSERT(environment->HasBeenRegistered());
+  int id = environment->deoptimization_index();
+  Address entry = Deoptimizer::GetDeoptimizationEntry(id, Deoptimizer::EAGER);
+  ASSERT(entry != NULL);
+  if (entry == NULL) {
+    Abort("bailout was not prepared");
+    return;
+  }
+
+  ASSERT(FLAG_deopt_every_n_times < 2);  // Other values not supported on MIPS.
+
+  if (FLAG_deopt_every_n_times == 1 &&
+      info_->shared_info()->opt_count() == id) {
+    __ Jump(entry, RelocInfo::RUNTIME_ENTRY);
+    return;
+  }
+
+  if (FLAG_trap_on_deopt) {
+    Label skip;
+    if (cc != al) {
+      __ Branch(&skip, NegateCondition(cc), src1, src2);
+    }
+    __ stop("trap_on_deopt");
+    __ bind(&skip);
+  }
+
+  if (cc == al) {
+    __ Jump(entry, RelocInfo::RUNTIME_ENTRY);
+  } else {
+    // TODO(plind): The Arm port is a little different here, due to their
+    // DeOpt jump table, which is not used for Mips yet.
+    __ Jump(entry, RelocInfo::RUNTIME_ENTRY, cc, src1, src2);
+  }
+}
+
+
+void LCodeGen::PopulateDeoptimizationData(Handle<Code> code) {
+  int length = deoptimizations_.length();
+  if (length == 0) return;
+  ASSERT(FLAG_deopt);
+  Handle<DeoptimizationInputData> data =
+      factory()->NewDeoptimizationInputData(length, TENURED);
+
+  Handle<ByteArray> translations = translations_.CreateByteArray();
+  data->SetTranslationByteArray(*translations);
+  data->SetInlinedFunctionCount(Smi::FromInt(inlined_function_count_));
+
+  Handle<FixedArray> literals =
+      factory()->NewFixedArray(deoptimization_literals_.length(), TENURED);
+  for (int i = 0; i < deoptimization_literals_.length(); i++) {
+    literals->set(i, *deoptimization_literals_[i]);
+  }
+  data->SetLiteralArray(*literals);
+
+  data->SetOsrAstId(Smi::FromInt(info_->osr_ast_id()));
+  data->SetOsrPcOffset(Smi::FromInt(osr_pc_offset_));
+
+  // Populate the deoptimization entries.
+  for (int i = 0; i < length; i++) {
+    LEnvironment* env = deoptimizations_[i];
+    data->SetAstId(i, Smi::FromInt(env->ast_id()));
+    data->SetTranslationIndex(i, Smi::FromInt(env->translation_index()));
+    data->SetArgumentsStackHeight(i,
+                                  Smi::FromInt(env->arguments_stack_height()));
+  }
+  code->set_deoptimization_data(*data);
+}
+
+
+int LCodeGen::DefineDeoptimizationLiteral(Handle<Object> literal) {
+  int result = deoptimization_literals_.length();
+  for (int i = 0; i < deoptimization_literals_.length(); ++i) {
+    if (deoptimization_literals_[i].is_identical_to(literal)) return i;
+  }
+  deoptimization_literals_.Add(literal);
+  return result;
+}
+
+
+void LCodeGen::PopulateDeoptimizationLiteralsWithInlinedFunctions() {
+  ASSERT(deoptimization_literals_.length() == 0);
+
+  const ZoneList<Handle<JSFunction> >* inlined_closures =
+      chunk()->inlined_closures();
+
+  for (int i = 0, length = inlined_closures->length();
+       i < length;
+       i++) {
+    DefineDeoptimizationLiteral(inlined_closures->at(i));
+  }
+
+  inlined_function_count_ = deoptimization_literals_.length();
+}
+
+
+void LCodeGen::RecordSafepoint(
+    LPointerMap* pointers,
+    Safepoint::Kind kind,
+    int arguments,
+    int deoptimization_index) {
+  ASSERT(expected_safepoint_kind_ == kind);
+
+  const ZoneList<LOperand*>* operands = pointers->GetNormalizedOperands();
+  Safepoint safepoint = safepoints_.DefineSafepoint(masm(),
+      kind, arguments, deoptimization_index);
+  for (int i = 0; i < operands->length(); i++) {
+    LOperand* pointer = operands->at(i);
+    if (pointer->IsStackSlot()) {
+      safepoint.DefinePointerSlot(pointer->index());
+    } else if (pointer->IsRegister() && (kind & Safepoint::kWithRegisters)) {
+      safepoint.DefinePointerRegister(ToRegister(pointer));
+    }
+  }
+  if (kind & Safepoint::kWithRegisters) {
+    // Register cp always contains a pointer to the context.
+    safepoint.DefinePointerRegister(cp);
+  }
+}
+
+
+void LCodeGen::RecordSafepoint(LPointerMap* pointers,
+                               int deoptimization_index) {
+  RecordSafepoint(pointers, Safepoint::kSimple, 0, deoptimization_index);
+}
+
+
+void LCodeGen::RecordSafepoint(int deoptimization_index) {
+  LPointerMap empty_pointers(RelocInfo::kNoPosition);
+  RecordSafepoint(&empty_pointers, deoptimization_index);
+}
+
+
+void LCodeGen::RecordSafepointWithRegisters(LPointerMap* pointers,
+                                            int arguments,
+                                            int deoptimization_index) {
+  RecordSafepoint(pointers, Safepoint::kWithRegisters, arguments,
+      deoptimization_index);
+}
+
+
+void LCodeGen::RecordSafepointWithRegistersAndDoubles(
+    LPointerMap* pointers,
+    int arguments,
+    int deoptimization_index) {
+  RecordSafepoint(pointers, Safepoint::kWithRegistersAndDoubles, arguments,
+      deoptimization_index);
+}
+
+
+void LCodeGen::RecordPosition(int position) {
+  if (position == RelocInfo::kNoPosition) return;
+  masm()->positions_recorder()->RecordPosition(position);
+}
+
+
+void LCodeGen::DoLabel(LLabel* label) {
+  if (label->is_loop_header()) {
+    Comment(";;; B%d - LOOP entry", label->block_id());
+  } else {
+    Comment(";;; B%d", label->block_id());
+  }
+  __ bind(label->label());
+  current_block_ = label->block_id();
+  DoGap(label);
+}
+
+
+void LCodeGen::DoParallelMove(LParallelMove* move) {
+  resolver_.Resolve(move);
+}
+
+
+void LCodeGen::DoGap(LGap* gap) {
+  for (int i = LGap::FIRST_INNER_POSITION;
+       i <= LGap::LAST_INNER_POSITION;
+       i++) {
+    LGap::InnerPosition inner_pos = static_cast<LGap::InnerPosition>(i);
+    LParallelMove* move = gap->GetParallelMove(inner_pos);
+    if (move != NULL) DoParallelMove(move);
+  }
+
+  LInstruction* next = GetNextInstruction();
+  if (next != NULL && next->IsLazyBailout()) {
+    int pc = masm()->pc_offset();
+    safepoints_.SetPcAfterGap(pc);
+  }
+}
+
+
+void LCodeGen::DoInstructionGap(LInstructionGap* instr) {
+  DoGap(instr);
+}
+
+
+void LCodeGen::DoParameter(LParameter* instr) {
+  // Nothing to do.
+}
+
+
+void LCodeGen::DoCallStub(LCallStub* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+  switch (instr->hydrogen()->major_key()) {
+    case CodeStub::RegExpConstructResult: {
+      RegExpConstructResultStub stub;
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
+    case CodeStub::RegExpExec: {
+      RegExpExecStub stub;
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
+    case CodeStub::SubString: {
+      SubStringStub stub;
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
+    case CodeStub::NumberToString: {
+      NumberToStringStub stub;
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
+    case CodeStub::StringAdd: {
+      StringAddStub stub(NO_STRING_ADD_FLAGS);
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
+    case CodeStub::StringCompare: {
+      StringCompareStub stub;
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
+    case CodeStub::TranscendentalCache: {
+      __ lw(a0, MemOperand(sp, 0));
+      TranscendentalCacheStub stub(instr->transcendental_type(),
+                                   TranscendentalCacheStub::TAGGED);
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
+    default:
+      UNREACHABLE();
+  }
+}
+
+
+void LCodeGen::DoUnknownOSRValue(LUnknownOSRValue* instr) {
+  // Nothing to do.
+}
+
+
+void LCodeGen::DoModI(LModI* instr) {
+  Register scratch = scratch0();
+  const Register left = ToRegister(instr->InputAt(0));
+  const Register result = ToRegister(instr->result());
+
+  // p2constant holds the right side value if it's a power of 2 constant.
+  // In other cases it is 0.
+  int32_t p2constant = 0;
+
+  if (instr->InputAt(1)->IsConstantOperand()) {
+      p2constant = ToInteger32(LConstantOperand::cast(instr->InputAt(1)));
+      if (p2constant % 2 != 0) {
+        p2constant = 0;
+      }
+      // Result always takes the sign of the dividend (left).
+      p2constant = abs(p2constant);
+  }
+
+  // div runs in the background while we check for special cases.
+  Register right = EmitLoadRegister(instr->InputAt(1), scratch);
+  __ div(left, right);
+
+  // Check for x % 0.
+  if (instr->hydrogen()->CheckFlag(HValue::kCanBeDivByZero)) {
+    DeoptimizeIf(eq, instr->environment(), right, Operand(zero_reg));
+  }
+
+  Label skip_div, do_div;
+  if (p2constant != 0) {
+    // Fall back to the result of the div instruction if we could have sign
+    // problems.
+    __ Branch(&do_div, lt, left, Operand(zero_reg));
+    // Modulo by masking.
+    __ And(scratch, left, p2constant - 1);
+    __ Branch(&skip_div);
+  }
+
+  __ bind(&do_div);
+  __ mfhi(scratch);
+  __ bind(&skip_div);
+
+  if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    // Result always takes the sign of the dividend (left).
+    Label done;
+    __ Branch(USE_DELAY_SLOT, &done, ge, left, Operand(zero_reg));
+    __ mov(result, scratch);
+    DeoptimizeIf(eq, instr->environment(), result, Operand(zero_reg));
+    __ bind(&done);
+  } else {
+    __ Move(result, scratch);
+  }
+}
+
+
+void LCodeGen::DoDivI(LDivI* instr) {
+  const Register left = ToRegister(instr->InputAt(0));
+  const Register right = ToRegister(instr->InputAt(1));
+  const Register result = ToRegister(instr->result());
+
+  // On MIPS div is asynchronous - it will run in the background while we
+  // check for special cases.
+  __ div(left, right);
+
+  // Check for x / 0.
+  if (instr->hydrogen()->CheckFlag(HValue::kCanBeDivByZero)) {
+    DeoptimizeIf(eq, instr->environment(), right, Operand(zero_reg));
+  }
+
+  // Check for (0 / -x) that will produce negative zero.
+  if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    Label left_not_zero;
+    __ Branch(&left_not_zero, ne, left, Operand(zero_reg));
+    DeoptimizeIf(lt, instr->environment(), right, Operand(zero_reg));
+    __ bind(&left_not_zero);
+  }
+
+  // Check for (-kMinInt / -1).
+  if (instr->hydrogen()->CheckFlag(HValue::kCanOverflow)) {
+    Label left_not_min_int;
+    __ Branch(&left_not_min_int, ne, left, Operand(kMinInt));
+    DeoptimizeIf(eq, instr->environment(), right, Operand(-1));
+    __ bind(&left_not_min_int);
+  }
+
+  __ mfhi(result);
+  DeoptimizeIf(ne, instr->environment(), result, Operand(zero_reg));
+  __ mflo(result);
+}
+
+
+void LCodeGen::DoMulI(LMulI* instr) {
+  Register scratch = scratch0();
+  Register result = ToRegister(instr->result());
+  // Note that result may alias left.
+  Register left = ToRegister(instr->InputAt(0));
+  LOperand* right_op = instr->InputAt(1);
+
+  bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
+  bool bailout_on_minus_zero =
+    instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero);
+
+  if (right_op->IsConstantOperand() && !can_overflow) {
+    // Use optimized code for specific constants.
+    int32_t constant = ToInteger32(LConstantOperand::cast(right_op));
+
+    if (bailout_on_minus_zero && (constant < 0)) {
+      // The case of a null constant will be handled separately.
+      // If constant is negative and left is null, the result should be -0.
+      DeoptimizeIf(eq, instr->environment(), left, Operand(zero_reg));
+    }
+
+    switch (constant) {
+      case -1:
+        __ Subu(result, zero_reg, left);
+        break;
+      case 0:
+        if (bailout_on_minus_zero) {
+          // If left is strictly negative and the constant is null, the
+          // result is -0. Deoptimize if required, otherwise return 0.
+          DeoptimizeIf(lt, instr->environment(), left, Operand(zero_reg));
+        }
+        __ mov(result, zero_reg);
+        break;
+      case 1:
+        // Nothing to do.
+        __ Move(result, left);
+        break;
+      default:
+        // Multiplying by powers of two and powers of two plus or minus
+        // one can be done faster with shifted operands.
+        // For other constants we emit standard code.
+        int32_t mask = constant >> 31;
+        uint32_t constant_abs = (constant + mask) ^ mask;
+
+        if (IsPowerOf2(constant_abs) ||
+            IsPowerOf2(constant_abs - 1) ||
+            IsPowerOf2(constant_abs + 1)) {
+          if (IsPowerOf2(constant_abs)) {
+            int32_t shift = WhichPowerOf2(constant_abs);
+            __ sll(result, left, shift);
+          } else if (IsPowerOf2(constant_abs - 1)) {
+            int32_t shift = WhichPowerOf2(constant_abs - 1);
+            __ sll(result, left, shift);
+            __ Addu(result, result, left);
+          } else if (IsPowerOf2(constant_abs + 1)) {
+            int32_t shift = WhichPowerOf2(constant_abs + 1);
+            __ sll(result, left, shift);
+            __ Subu(result, result, left);
+          }
+
+          // Correct the sign of the result is the constant is negative.
+          if (constant < 0)  {
+            __ Subu(result, zero_reg, result);
+          }
+
+        } else {
+          // Generate standard code.
+          __ li(at, constant);
+          __ mul(result, left, at);
+        }
+    }
+
+  } else {
+    Register right = EmitLoadRegister(right_op, scratch);
+    if (bailout_on_minus_zero) {
+      __ Or(ToRegister(instr->TempAt(0)), left, right);
+    }
+
+    if (can_overflow) {
+      // hi:lo = left * right.
+      __ mult(left, right);
+      __ mfhi(scratch);
+      __ mflo(result);
+      __ sra(at, result, 31);
+      DeoptimizeIf(ne, instr->environment(), scratch, Operand(at));
+    } else {
+      __ mul(result, left, right);
+    }
+
+    if (bailout_on_minus_zero) {
+      // Bail out if the result is supposed to be negative zero.
+      Label done;
+      __ Branch(&done, ne, result, Operand(zero_reg));
+      DeoptimizeIf(lt,
+                   instr->environment(),
+                   ToRegister(instr->TempAt(0)),
+                   Operand(zero_reg));
+      __ bind(&done);
+    }
+  }
+}
+
+
+void LCodeGen::DoBitI(LBitI* instr) {
+  LOperand* left_op = instr->InputAt(0);
+  LOperand* right_op = instr->InputAt(1);
+  ASSERT(left_op->IsRegister());
+  Register left = ToRegister(left_op);
+  Register result = ToRegister(instr->result());
+  Operand right(no_reg);
+
+  if (right_op->IsStackSlot() || right_op->IsArgument()) {
+    right = Operand(EmitLoadRegister(right_op, at));
+  } else {
+    ASSERT(right_op->IsRegister() || right_op->IsConstantOperand());
+    right = ToOperand(right_op);
+  }
+
+  switch (instr->op()) {
+    case Token::BIT_AND:
+      __ And(result, left, right);
+      break;
+    case Token::BIT_OR:
+      __ Or(result, left, right);
+      break;
+    case Token::BIT_XOR:
+      __ Xor(result, left, right);
+      break;
+    default:
+      UNREACHABLE();
+      break;
+  }
+}
+
+
+void LCodeGen::DoShiftI(LShiftI* instr) {
+  // Both 'left' and 'right' are "used at start" (see LCodeGen::DoShift), so
+  // result may alias either of them.
+  LOperand* right_op = instr->InputAt(1);
+  Register left = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+
+  if (right_op->IsRegister()) {
+    // No need to mask the right operand on MIPS, it is built into the variable
+    // shift instructions.
+    switch (instr->op()) {
+      case Token::SAR:
+        __ srav(result, left, ToRegister(right_op));
+        break;
+      case Token::SHR:
+        __ srlv(result, left, ToRegister(right_op));
+        if (instr->can_deopt()) {
+          DeoptimizeIf(lt, instr->environment(), result, Operand(zero_reg));
+        }
+        break;
+      case Token::SHL:
+        __ sllv(result, left, ToRegister(right_op));
+        break;
+      default:
+        UNREACHABLE();
+        break;
+    }
+  } else {
+    // Mask the right_op operand.
+    int value = ToInteger32(LConstantOperand::cast(right_op));
+    uint8_t shift_count = static_cast<uint8_t>(value & 0x1F);
+    switch (instr->op()) {
+      case Token::SAR:
+        if (shift_count != 0) {
+          __ sra(result, left, shift_count);
+        } else {
+          __ Move(result, left);
+        }
+        break;
+      case Token::SHR:
+        if (shift_count != 0) {
+          __ srl(result, left, shift_count);
+        } else {
+          if (instr->can_deopt()) {
+            __ And(at, left, Operand(0x80000000));
+            DeoptimizeIf(ne, instr->environment(), at, Operand(zero_reg));
+          }
+          __ Move(result, left);
+        }
+        break;
+      case Token::SHL:
+        if (shift_count != 0) {
+          __ sll(result, left, shift_count);
+        } else {
+          __ Move(result, left);
+        }
+        break;
+      default:
+        UNREACHABLE();
+        break;
+    }
+  }
+}
+
+
+void LCodeGen::DoSubI(LSubI* instr) {
+  LOperand* left = instr->InputAt(0);
+  LOperand* right = instr->InputAt(1);
+  LOperand* result = instr->result();
+  bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
+
+  if (!can_overflow) {
+    if (right->IsStackSlot() || right->IsArgument()) {
+      Register right_reg = EmitLoadRegister(right, at);
+      __ Subu(ToRegister(result), ToRegister(left), Operand(right_reg));
+    } else {
+      ASSERT(right->IsRegister() || right->IsConstantOperand());
+      __ Subu(ToRegister(result), ToRegister(left), ToOperand(right));
+    }
+  } else {  // can_overflow.
+    Register overflow = scratch0();
+    Register scratch = scratch1();
+    if (right->IsStackSlot() ||
+        right->IsArgument() ||
+        right->IsConstantOperand()) {
+      Register right_reg = EmitLoadRegister(right, scratch);
+      __ SubuAndCheckForOverflow(ToRegister(result),
+                                 ToRegister(left),
+                                 right_reg,
+                                 overflow);  // Reg at also used as scratch.
+    } else {
+      ASSERT(right->IsRegister());
+      // Due to overflow check macros not supporting constant operands,
+      // handling the IsConstantOperand case was moved to prev if clause.
+      __ SubuAndCheckForOverflow(ToRegister(result),
+                                 ToRegister(left),
+                                 ToRegister(right),
+                                 overflow);  // Reg at also used as scratch.
+    }
+    DeoptimizeIf(lt, instr->environment(), overflow, Operand(zero_reg));
+  }
+}
+
+
+void LCodeGen::DoConstantI(LConstantI* instr) {
+  ASSERT(instr->result()->IsRegister());
+  __ li(ToRegister(instr->result()), Operand(instr->value()));
+}
+
+
+void LCodeGen::DoConstantD(LConstantD* instr) {
+  ASSERT(instr->result()->IsDoubleRegister());
+  DoubleRegister result = ToDoubleRegister(instr->result());
+  double v = instr->value();
+  __ Move(result, v);
+}
+
+
+void LCodeGen::DoConstantT(LConstantT* instr) {
+  ASSERT(instr->result()->IsRegister());
+  __ li(ToRegister(instr->result()), Operand(instr->value()));
+}
+
+
+void LCodeGen::DoJSArrayLength(LJSArrayLength* instr) {
+  Register result = ToRegister(instr->result());
+  Register array = ToRegister(instr->InputAt(0));
+  __ lw(result, FieldMemOperand(array, JSArray::kLengthOffset));
+}
+
+
+void LCodeGen::DoFixedArrayBaseLength(LFixedArrayBaseLength* instr) {
+  Register result = ToRegister(instr->result());
+  Register array = ToRegister(instr->InputAt(0));
+  __ lw(result, FieldMemOperand(array, FixedArrayBase::kLengthOffset));
+}
+
+
+void LCodeGen::DoElementsKind(LElementsKind* instr) {
+  Register result = ToRegister(instr->result());
+  Register input = ToRegister(instr->InputAt(0));
+
+  // Load map into |result|.
+  __ lw(result, FieldMemOperand(input, HeapObject::kMapOffset));
+  // Load the map's "bit field 2" into |result|. We only need the first byte,
+  // but the following bit field extraction takes care of that anyway.
+  __ lbu(result, FieldMemOperand(result, Map::kBitField2Offset));
+  // Retrieve elements_kind from bit field 2.
+  __ Ext(result, result, Map::kElementsKindShift, Map::kElementsKindBitCount);
+}
+
+
+void LCodeGen::DoValueOf(LValueOf* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  Register map = ToRegister(instr->TempAt(0));
+  Label done;
+
+  // If the object is a smi return the object.
+  __ Move(result, input);
+  __ JumpIfSmi(input, &done);
+
+  // If the object is not a value type, return the object.
+  __ GetObjectType(input, map, map);
+  __ Branch(&done, ne, map, Operand(JS_VALUE_TYPE));
+  __ lw(result, FieldMemOperand(input, JSValue::kValueOffset));
+
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoBitNotI(LBitNotI* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  __ Nor(result, zero_reg, Operand(input));
+}
+
+
+void LCodeGen::DoThrow(LThrow* instr) {
+  Register input_reg = EmitLoadRegister(instr->InputAt(0), at);
+  __ push(input_reg);
+  CallRuntime(Runtime::kThrow, 1, instr);
+
+  if (FLAG_debug_code) {
+    __ stop("Unreachable code.");
+  }
+}
+
+
+void LCodeGen::DoAddI(LAddI* instr) {
+  LOperand* left = instr->InputAt(0);
+  LOperand* right = instr->InputAt(1);
+  LOperand* result = instr->result();
+  bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
+
+  if (!can_overflow) {
+    if (right->IsStackSlot() || right->IsArgument()) {
+      Register right_reg = EmitLoadRegister(right, at);
+      __ Addu(ToRegister(result), ToRegister(left), Operand(right_reg));
+    } else {
+      ASSERT(right->IsRegister() || right->IsConstantOperand());
+      __ Addu(ToRegister(result), ToRegister(left), ToOperand(right));
+    }
+  } else {  // can_overflow.
+    Register overflow = scratch0();
+    Register scratch = scratch1();
+    if (right->IsStackSlot() ||
+        right->IsArgument() ||
+        right->IsConstantOperand()) {
+      Register right_reg = EmitLoadRegister(right, scratch);
+      __ AdduAndCheckForOverflow(ToRegister(result),
+                                 ToRegister(left),
+                                 right_reg,
+                                 overflow);  // Reg at also used as scratch.
+    } else {
+      ASSERT(right->IsRegister());
+      // Due to overflow check macros not supporting constant operands,
+      // handling the IsConstantOperand case was moved to prev if clause.
+      __ AdduAndCheckForOverflow(ToRegister(result),
+                                 ToRegister(left),
+                                 ToRegister(right),
+                                 overflow);  // Reg at also used as scratch.
+    }
+    DeoptimizeIf(lt, instr->environment(), overflow, Operand(zero_reg));
+  }
+}
+
+
+void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
+  DoubleRegister left = ToDoubleRegister(instr->InputAt(0));
+  DoubleRegister right = ToDoubleRegister(instr->InputAt(1));
+  DoubleRegister result = ToDoubleRegister(instr->result());
+  switch (instr->op()) {
+    case Token::ADD:
+      __ add_d(result, left, right);
+      break;
+    case Token::SUB:
+      __ sub_d(result, left, right);
+      break;
+    case Token::MUL:
+      __ mul_d(result, left, right);
+      break;
+    case Token::DIV:
+      __ div_d(result, left, right);
+      break;
+    case Token::MOD: {
+      // Save a0-a3 on the stack.
+      RegList saved_regs = a0.bit() | a1.bit() | a2.bit() | a3.bit();
+      __ MultiPush(saved_regs);
+
+      __ PrepareCallCFunction(0, 2, scratch0());
+      __ SetCallCDoubleArguments(left, right);
+      __ CallCFunction(
+          ExternalReference::double_fp_operation(Token::MOD, isolate()),
+          0, 2);
+      // Move the result in the double result register.
+      __ GetCFunctionDoubleResult(result);
+
+      // Restore saved register.
+      __ MultiPop(saved_regs);
+      break;
+    }
+    default:
+      UNREACHABLE();
+      break;
+  }
+}
+
+
+void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
+  ASSERT(ToRegister(instr->InputAt(0)).is(a1));
+  ASSERT(ToRegister(instr->InputAt(1)).is(a0));
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  BinaryOpStub stub(instr->op(), NO_OVERWRITE);
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  // Other arch use a nop here, to signal that there is no inlined
+  // patchable code. Mips does not need the nop, since our marker
+  // instruction (andi zero_reg) will never be used in normal code.
+}
+
+
+int LCodeGen::GetNextEmittedBlock(int block) {
+  for (int i = block + 1; i < graph()->blocks()->length(); ++i) {
+    LLabel* label = chunk_->GetLabel(i);
+    if (!label->HasReplacement()) return i;
+  }
+  return -1;
+}
+
+
+void LCodeGen::EmitBranch(int left_block, int right_block,
+                          Condition cc, Register src1, const Operand& src2) {
+  int next_block = GetNextEmittedBlock(current_block_);
+  right_block = chunk_->LookupDestination(right_block);
+  left_block = chunk_->LookupDestination(left_block);
+  if (right_block == left_block) {
+    EmitGoto(left_block);
+  } else if (left_block == next_block) {
+    __ Branch(chunk_->GetAssemblyLabel(right_block),
+              NegateCondition(cc), src1, src2);
+  } else if (right_block == next_block) {
+    __ Branch(chunk_->GetAssemblyLabel(left_block), cc, src1, src2);
+  } else {
+    __ Branch(chunk_->GetAssemblyLabel(left_block), cc, src1, src2);
+    __ Branch(chunk_->GetAssemblyLabel(right_block));
+  }
+}
+
+
+void LCodeGen::EmitBranchF(int left_block, int right_block,
+                           Condition cc, FPURegister src1, FPURegister src2) {
+  int next_block = GetNextEmittedBlock(current_block_);
+  right_block = chunk_->LookupDestination(right_block);
+  left_block = chunk_->LookupDestination(left_block);
+  if (right_block == left_block) {
+    EmitGoto(left_block);
+  } else if (left_block == next_block) {
+    __ BranchF(chunk_->GetAssemblyLabel(right_block), NULL,
+               NegateCondition(cc), src1, src2);
+  } else if (right_block == next_block) {
+    __ BranchF(chunk_->GetAssemblyLabel(left_block), NULL, cc, src1, src2);
+  } else {
+    __ BranchF(chunk_->GetAssemblyLabel(left_block), NULL, cc, src1, src2);
+    __ Branch(chunk_->GetAssemblyLabel(right_block));
+  }
+}
+
+
+void LCodeGen::DoBranch(LBranch* instr) {
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  Representation r = instr->hydrogen()->value()->representation();
+  if (r.IsInteger32()) {
+    Register reg = ToRegister(instr->InputAt(0));
+    EmitBranch(true_block, false_block, ne, reg, Operand(zero_reg));
+  } else if (r.IsDouble()) {
+    DoubleRegister reg = ToDoubleRegister(instr->InputAt(0));
+    // Test the double value. Zero and NaN are false.
+    EmitBranchF(true_block, false_block, ne, reg, kDoubleRegZero);
+  } else {
+    ASSERT(r.IsTagged());
+    Register reg = ToRegister(instr->InputAt(0));
+    HType type = instr->hydrogen()->value()->type();
+    if (type.IsBoolean()) {
+      __ LoadRoot(at, Heap::kTrueValueRootIndex);
+      EmitBranch(true_block, false_block, eq, reg, Operand(at));
+    } else if (type.IsSmi()) {
+      EmitBranch(true_block, false_block, ne, reg, Operand(zero_reg));
+    } else {
+      Label* true_label = chunk_->GetAssemblyLabel(true_block);
+      Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+      ToBooleanStub::Types expected = instr->hydrogen()->expected_input_types();
+      // Avoid deopts in the case where we've never executed this path before.
+      if (expected.IsEmpty()) expected = ToBooleanStub::all_types();
+
+      if (expected.Contains(ToBooleanStub::UNDEFINED)) {
+        // undefined -> false.
+        __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+        __ Branch(false_label, eq, reg, Operand(at));
+      }
+      if (expected.Contains(ToBooleanStub::BOOLEAN)) {
+        // Boolean -> its value.
+        __ LoadRoot(at, Heap::kTrueValueRootIndex);
+        __ Branch(true_label, eq, reg, Operand(at));
+        __ LoadRoot(at, Heap::kFalseValueRootIndex);
+        __ Branch(false_label, eq, reg, Operand(at));
+      }
+      if (expected.Contains(ToBooleanStub::NULL_TYPE)) {
+        // 'null' -> false.
+        __ LoadRoot(at, Heap::kNullValueRootIndex);
+        __ Branch(false_label, eq, reg, Operand(at));
+      }
+
+      if (expected.Contains(ToBooleanStub::SMI)) {
+        // Smis: 0 -> false, all other -> true.
+        __ Branch(false_label, eq, reg, Operand(zero_reg));
+        __ JumpIfSmi(reg, true_label);
+      } else if (expected.NeedsMap()) {
+        // If we need a map later and have a Smi -> deopt.
+        __ And(at, reg, Operand(kSmiTagMask));
+        DeoptimizeIf(eq, instr->environment(), at, Operand(zero_reg));
+      }
+
+      const Register map = scratch0();
+      if (expected.NeedsMap()) {
+        __ lw(map, FieldMemOperand(reg, HeapObject::kMapOffset));
+        if (expected.CanBeUndetectable()) {
+          // Undetectable -> false.
+          __ lbu(at, FieldMemOperand(map, Map::kBitFieldOffset));
+          __ And(at, at, Operand(1 << Map::kIsUndetectable));
+          __ Branch(false_label, ne, at, Operand(zero_reg));
+        }
+      }
+
+      if (expected.Contains(ToBooleanStub::SPEC_OBJECT)) {
+        // spec object -> true.
+        __ lbu(at, FieldMemOperand(map, Map::kInstanceTypeOffset));
+        __ Branch(true_label, ge, at, Operand(FIRST_SPEC_OBJECT_TYPE));
+      }
+
+      if (expected.Contains(ToBooleanStub::STRING)) {
+        // String value -> false iff empty.
+        Label not_string;
+        __ lbu(at, FieldMemOperand(map, Map::kInstanceTypeOffset));
+        __ Branch(&not_string, ge , at, Operand(FIRST_NONSTRING_TYPE));
+        __ lw(at, FieldMemOperand(reg, String::kLengthOffset));
+        __ Branch(true_label, ne, at, Operand(zero_reg));
+        __ Branch(false_label);
+        __ bind(&not_string);
+      }
+
+      if (expected.Contains(ToBooleanStub::HEAP_NUMBER)) {
+        // heap number -> false iff +0, -0, or NaN.
+        DoubleRegister dbl_scratch = double_scratch0();
+        Label not_heap_number;
+        __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+        __ Branch(&not_heap_number, ne, map, Operand(at));
+        __ ldc1(dbl_scratch, FieldMemOperand(reg, HeapNumber::kValueOffset));
+        __ BranchF(true_label, false_label, ne, dbl_scratch, kDoubleRegZero);
+        // Falls through if dbl_scratch == 0.
+        __ Branch(false_label);
+        __ bind(&not_heap_number);
+      }
+
+      // We've seen something for the first time -> deopt.
+      DeoptimizeIf(al, instr->environment(), zero_reg, Operand(zero_reg));
+    }
+  }
+}
+
+
+void LCodeGen::EmitGoto(int block) {
+  block = chunk_->LookupDestination(block);
+  int next_block = GetNextEmittedBlock(current_block_);
+  if (block != next_block) {
+    __ jmp(chunk_->GetAssemblyLabel(block));
+  }
+}
+
+
+void LCodeGen::DoGoto(LGoto* instr) {
+  EmitGoto(instr->block_id());
+}
+
+
+Condition LCodeGen::TokenToCondition(Token::Value op, bool is_unsigned) {
+  Condition cond = kNoCondition;
+  switch (op) {
+    case Token::EQ:
+    case Token::EQ_STRICT:
+      cond = eq;
+      break;
+    case Token::LT:
+      cond = is_unsigned ? lo : lt;
+      break;
+    case Token::GT:
+      cond = is_unsigned ? hi : gt;
+      break;
+    case Token::LTE:
+      cond = is_unsigned ? ls : le;
+      break;
+    case Token::GTE:
+      cond = is_unsigned ? hs : ge;
+      break;
+    case Token::IN:
+    case Token::INSTANCEOF:
+    default:
+      UNREACHABLE();
+  }
+  return cond;
+}
+
+
+void LCodeGen::EmitCmpI(LOperand* left, LOperand* right) {
+  // This function must never be called for Mips.
+  // It is just a compare, it should be generated inline as
+  // part of the branch that uses it. It should always remain
+  // as un-implemented function.
+  // arm: __ cmp(ToRegister(left), ToRegister(right));
+  Abort("Unimplemented: %s (line %d)", __func__, __LINE__);
+}
+
+
+void LCodeGen::DoCmpIDAndBranch(LCmpIDAndBranch* instr) {
+  LOperand* left = instr->InputAt(0);
+  LOperand* right = instr->InputAt(1);
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+
+  Condition cc = TokenToCondition(instr->op(), instr->is_double());
+
+  if (instr->is_double()) {
+    // Compare left and right as doubles and load the
+    // resulting flags into the normal status register.
+    FPURegister left_reg = ToDoubleRegister(left);
+    FPURegister right_reg = ToDoubleRegister(right);
+
+    // If a NaN is involved, i.e. the result is unordered,
+    // jump to false block label.
+    __ BranchF(NULL, chunk_->GetAssemblyLabel(false_block), eq,
+               left_reg, right_reg);
+
+    EmitBranchF(true_block, false_block, cc, left_reg, right_reg);
+  } else {
+    // EmitCmpI cannot be used on MIPS.
+    // EmitCmpI(left, right);
+    EmitBranch(true_block,
+               false_block,
+               cc,
+               ToRegister(left),
+               Operand(ToRegister(right)));
+  }
+}
+
+
+void LCodeGen::DoCmpObjectEqAndBranch(LCmpObjectEqAndBranch* instr) {
+  Register left = ToRegister(instr->InputAt(0));
+  Register right = ToRegister(instr->InputAt(1));
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+
+  EmitBranch(true_block, false_block, eq, left, Operand(right));
+}
+
+
+void LCodeGen::DoCmpConstantEqAndBranch(LCmpConstantEqAndBranch* instr) {
+  Register left = ToRegister(instr->InputAt(0));
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  EmitBranch(true_block, false_block, eq, left,
+             Operand(instr->hydrogen()->right()));
+}
+
+
+
+void LCodeGen::DoIsNilAndBranch(LIsNilAndBranch* instr) {
+  Register scratch = scratch0();
+  Register reg = ToRegister(instr->InputAt(0));
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  // If the expression is known to be untagged or a smi, then it's definitely
+  // not null, and it can't be a an undetectable object.
+  if (instr->hydrogen()->representation().IsSpecialization() ||
+      instr->hydrogen()->type().IsSmi()) {
+    EmitGoto(false_block);
+    return;
+  }
+
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+
+  Heap::RootListIndex nil_value = instr->nil() == kNullValue ?
+      Heap::kNullValueRootIndex :
+      Heap::kUndefinedValueRootIndex;
+  __ LoadRoot(at, nil_value);
+  if (instr->kind() == kStrictEquality) {
+    EmitBranch(true_block, false_block, eq, reg, Operand(at));
+  } else {
+    Heap::RootListIndex other_nil_value = instr->nil() == kNullValue ?
+        Heap::kUndefinedValueRootIndex :
+        Heap::kNullValueRootIndex;
+    Label* true_label = chunk_->GetAssemblyLabel(true_block);
+    Label* false_label = chunk_->GetAssemblyLabel(false_block);
+    __ Branch(USE_DELAY_SLOT, true_label, eq, reg, Operand(at));
+    __ LoadRoot(at, other_nil_value);  // In the delay slot.
+    __ Branch(USE_DELAY_SLOT, true_label, eq, reg, Operand(at));
+    __ JumpIfSmi(reg, false_label);  // In the delay slot.
+    // Check for undetectable objects by looking in the bit field in
+    // the map. The object has already been smi checked.
+    __ lw(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+    __ lbu(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
+    __ And(scratch, scratch, 1 << Map::kIsUndetectable);
+    EmitBranch(true_block, false_block, ne, scratch, Operand(zero_reg));
+  }
+}
+
+
+Condition LCodeGen::EmitIsObject(Register input,
+                                 Register temp1,
+                                 Label* is_not_object,
+                                 Label* is_object) {
+  Register temp2 = scratch0();
+  __ JumpIfSmi(input, is_not_object);
+
+  __ LoadRoot(temp2, Heap::kNullValueRootIndex);
+  __ Branch(is_object, eq, input, Operand(temp2));
+
+  // Load map.
+  __ lw(temp1, FieldMemOperand(input, HeapObject::kMapOffset));
+  // Undetectable objects behave like undefined.
+  __ lbu(temp2, FieldMemOperand(temp1, Map::kBitFieldOffset));
+  __ And(temp2, temp2, Operand(1 << Map::kIsUndetectable));
+  __ Branch(is_not_object, ne, temp2, Operand(zero_reg));
+
+  // Load instance type and check that it is in object type range.
+  __ lbu(temp2, FieldMemOperand(temp1, Map::kInstanceTypeOffset));
+  __ Branch(is_not_object,
+            lt, temp2, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
+
+  return le;
+}
+
+
+void LCodeGen::DoIsObjectAndBranch(LIsObjectAndBranch* instr) {
+  Register reg = ToRegister(instr->InputAt(0));
+  Register temp1 = ToRegister(instr->TempAt(0));
+  Register temp2 = scratch0();
+
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+  Label* true_label = chunk_->GetAssemblyLabel(true_block);
+  Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+  Condition true_cond =
+      EmitIsObject(reg, temp1, false_label, true_label);
+
+  EmitBranch(true_block, false_block, true_cond, temp2,
+             Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE));
+}
+
+
+void LCodeGen::DoIsSmiAndBranch(LIsSmiAndBranch* instr) {
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  Register input_reg = EmitLoadRegister(instr->InputAt(0), at);
+  __ And(at, input_reg, kSmiTagMask);
+  EmitBranch(true_block, false_block, eq, at, Operand(zero_reg));
+}
+
+
+void LCodeGen::DoIsUndetectableAndBranch(LIsUndetectableAndBranch* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register temp = ToRegister(instr->TempAt(0));
+
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  __ JumpIfSmi(input, chunk_->GetAssemblyLabel(false_block));
+  __ lw(temp, FieldMemOperand(input, HeapObject::kMapOffset));
+  __ lbu(temp, FieldMemOperand(temp, Map::kBitFieldOffset));
+  __ And(at, temp, Operand(1 << Map::kIsUndetectable));
+  EmitBranch(true_block, false_block, ne, at, Operand(zero_reg));
+}
+
+
+static InstanceType TestType(HHasInstanceTypeAndBranch* instr) {
+  InstanceType from = instr->from();
+  InstanceType to = instr->to();
+  if (from == FIRST_TYPE) return to;
+  ASSERT(from == to || to == LAST_TYPE);
+  return from;
+}
+
+
+static Condition BranchCondition(HHasInstanceTypeAndBranch* instr) {
+  InstanceType from = instr->from();
+  InstanceType to = instr->to();
+  if (from == to) return eq;
+  if (to == LAST_TYPE) return hs;
+  if (from == FIRST_TYPE) return ls;
+  UNREACHABLE();
+  return eq;
+}
+
+
+void LCodeGen::DoHasInstanceTypeAndBranch(LHasInstanceTypeAndBranch* instr) {
+  Register scratch = scratch0();
+  Register input = ToRegister(instr->InputAt(0));
+
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+  __ JumpIfSmi(input, false_label);
+
+  __ GetObjectType(input, scratch, scratch);
+  EmitBranch(true_block,
+             false_block,
+             BranchCondition(instr->hydrogen()),
+             scratch,
+             Operand(TestType(instr->hydrogen())));
+}
+
+
+void LCodeGen::DoGetCachedArrayIndex(LGetCachedArrayIndex* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+
+  if (FLAG_debug_code) {
+    __ AbortIfNotString(input);
+  }
+
+  __ lw(result, FieldMemOperand(input, String::kHashFieldOffset));
+  __ IndexFromHash(result, result);
+}
+
+
+void LCodeGen::DoHasCachedArrayIndexAndBranch(
+    LHasCachedArrayIndexAndBranch* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register scratch = scratch0();
+
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  __ lw(scratch,
+         FieldMemOperand(input, String::kHashFieldOffset));
+  __ And(at, scratch, Operand(String::kContainsCachedArrayIndexMask));
+  EmitBranch(true_block, false_block, eq, at, Operand(zero_reg));
+}
+
+
+// Branches to a label or falls through with this instance class-name adr
+// returned in temp reg, available for comparison by the caller. Trashes the
+// temp registers, but not the input. Only input and temp2 may alias.
+void LCodeGen::EmitClassOfTest(Label* is_true,
+                               Label* is_false,
+                               Handle<String>class_name,
+                               Register input,
+                               Register temp,
+                               Register temp2) {
+  ASSERT(!input.is(temp));
+  ASSERT(!temp.is(temp2));  // But input and temp2 may be the same register.
+  __ JumpIfSmi(input, is_false);
+
+  if (class_name->IsEqualTo(CStrVector("Function"))) {
+    // Assuming the following assertions, we can use the same compares to test
+    // for both being a function type and being in the object type range.
+    STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
+    STATIC_ASSERT(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE ==
+                  FIRST_SPEC_OBJECT_TYPE + 1);
+    STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE ==
+                  LAST_SPEC_OBJECT_TYPE - 1);
+    STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
+
+    __ GetObjectType(input, temp, temp2);
+    __ Branch(is_false, lt, temp2, Operand(FIRST_SPEC_OBJECT_TYPE));
+    __ Branch(is_true, eq, temp2, Operand(FIRST_SPEC_OBJECT_TYPE));
+    __ Branch(is_true, eq, temp2, Operand(LAST_SPEC_OBJECT_TYPE));
+  } else {
+    // Faster code path to avoid two compares: subtract lower bound from the
+    // actual type and do a signed compare with the width of the type range.
+    __ GetObjectType(input, temp, temp2);
+    __ Subu(temp2, temp2, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
+    __ Branch(is_false, gt, temp2, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE -
+                                           FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
+  }
+
+  // Now we are in the FIRST-LAST_NONCALLABLE_SPEC_OBJECT_TYPE range.
+  // Check if the constructor in the map is a function.
+  __ lw(temp, FieldMemOperand(temp, Map::kConstructorOffset));
+
+  // Objects with a non-function constructor have class 'Object'.
+  __ GetObjectType(temp, temp2, temp2);
+  if (class_name->IsEqualTo(CStrVector("Object"))) {
+    __ Branch(is_true, ne, temp2, Operand(JS_FUNCTION_TYPE));
+  } else {
+    __ Branch(is_false, ne, temp2, Operand(JS_FUNCTION_TYPE));
+  }
+
+  // temp now contains the constructor function. Grab the
+  // instance class name from there.
+  __ lw(temp, FieldMemOperand(temp, JSFunction::kSharedFunctionInfoOffset));
+  __ lw(temp, FieldMemOperand(temp,
+                               SharedFunctionInfo::kInstanceClassNameOffset));
+  // The class name we are testing against is a symbol because it's a literal.
+  // The name in the constructor is a symbol because of the way the context is
+  // booted.  This routine isn't expected to work for random API-created
+  // classes and it doesn't have to because you can't access it with natives
+  // syntax.  Since both sides are symbols it is sufficient to use an identity
+  // comparison.
+
+  // End with the address of this class_name instance in temp register.
+  // On MIPS, the caller must do the comparison with Handle<String>class_name.
+}
+
+
+void LCodeGen::DoClassOfTestAndBranch(LClassOfTestAndBranch* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register temp = scratch0();
+  Register temp2 = ToRegister(instr->TempAt(0));
+  Handle<String> class_name = instr->hydrogen()->class_name();
+
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  Label* true_label = chunk_->GetAssemblyLabel(true_block);
+  Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+  EmitClassOfTest(true_label, false_label, class_name, input, temp, temp2);
+
+  EmitBranch(true_block, false_block, eq, temp, Operand(class_name));
+}
+
+
+void LCodeGen::DoCmpMapAndBranch(LCmpMapAndBranch* instr) {
+  Register reg = ToRegister(instr->InputAt(0));
+  Register temp = ToRegister(instr->TempAt(0));
+  int true_block = instr->true_block_id();
+  int false_block = instr->false_block_id();
+
+  __ lw(temp, FieldMemOperand(reg, HeapObject::kMapOffset));
+  EmitBranch(true_block, false_block, eq, temp, Operand(instr->map()));
+}
+
+
+void LCodeGen::DoInstanceOf(LInstanceOf* instr) {
+  Label true_label, done;
+  ASSERT(ToRegister(instr->InputAt(0)).is(a0));  // Object is in a0.
+  ASSERT(ToRegister(instr->InputAt(1)).is(a1));  // Function is in a1.
+  Register result = ToRegister(instr->result());
+  ASSERT(result.is(v0));
+
+  InstanceofStub stub(InstanceofStub::kArgsInRegisters);
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+
+  __ Branch(&true_label, eq, result, Operand(zero_reg));
+  __ li(result, Operand(factory()->false_value()));
+  __ Branch(&done);
+  __ bind(&true_label);
+  __ li(result, Operand(factory()->true_value()));
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr) {
+  class DeferredInstanceOfKnownGlobal: public LDeferredCode {
+   public:
+    DeferredInstanceOfKnownGlobal(LCodeGen* codegen,
+                                  LInstanceOfKnownGlobal* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() {
+      codegen()->DoDeferredLInstanceOfKnownGlobal(instr_, &map_check_);
+    }
+    virtual LInstruction* instr() { return instr_; }
+    Label* map_check() { return &map_check_; }
+
+   private:
+    LInstanceOfKnownGlobal* instr_;
+    Label map_check_;
+  };
+
+  DeferredInstanceOfKnownGlobal* deferred;
+  deferred = new DeferredInstanceOfKnownGlobal(this, instr);
+
+  Label done, false_result;
+  Register object = ToRegister(instr->InputAt(0));
+  Register temp = ToRegister(instr->TempAt(0));
+  Register result = ToRegister(instr->result());
+
+  ASSERT(object.is(a0));
+  ASSERT(result.is(v0));
+
+  // A Smi is not instance of anything.
+  __ JumpIfSmi(object, &false_result);
+
+  // This is the inlined call site instanceof cache. The two occurences of the
+  // hole value will be patched to the last map/result pair generated by the
+  // instanceof stub.
+  Label cache_miss;
+  Register map = temp;
+  __ lw(map, FieldMemOperand(object, HeapObject::kMapOffset));
+
+  Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
+  __ bind(deferred->map_check());  // Label for calculating code patching.
+  // We use Factory::the_hole_value() on purpose instead of loading from the
+  // root array to force relocation to be able to later patch with
+  // the cached map.
+  __ li(at, Operand(factory()->the_hole_value()), true);
+  __ Branch(&cache_miss, ne, map, Operand(at));
+  // We use Factory::the_hole_value() on purpose instead of loading from the
+  // root array to force relocation to be able to later patch
+  // with true or false.
+  __ li(result, Operand(factory()->the_hole_value()), true);
+  __ Branch(&done);
+
+  // The inlined call site cache did not match. Check null and string before
+  // calling the deferred code.
+  __ bind(&cache_miss);
+  // Null is not instance of anything.
+  __ LoadRoot(temp, Heap::kNullValueRootIndex);
+  __ Branch(&false_result, eq, object, Operand(temp));
+
+  // String values is not instance of anything.
+  Condition cc = __ IsObjectStringType(object, temp, temp);
+  __ Branch(&false_result, cc, temp, Operand(zero_reg));
+
+  // Go to the deferred code.
+  __ Branch(deferred->entry());
+
+  __ bind(&false_result);
+  __ LoadRoot(result, Heap::kFalseValueRootIndex);
+
+  // Here result has either true or false. Deferred code also produces true or
+  // false object.
+  __ bind(deferred->exit());
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoDeferredLInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
+                                                Label* map_check) {
+  Register result = ToRegister(instr->result());
+  ASSERT(result.is(v0));
+
+  InstanceofStub::Flags flags = InstanceofStub::kNoFlags;
+  flags = static_cast<InstanceofStub::Flags>(
+      flags | InstanceofStub::kArgsInRegisters);
+  flags = static_cast<InstanceofStub::Flags>(
+      flags | InstanceofStub::kCallSiteInlineCheck);
+  flags = static_cast<InstanceofStub::Flags>(
+      flags | InstanceofStub::kReturnTrueFalseObject);
+  InstanceofStub stub(flags);
+
+  PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
+
+  // Get the temp register reserved by the instruction. This needs to be t0 as
+  // its slot of the pushing of safepoint registers is used to communicate the
+  // offset to the location of the map check.
+  Register temp = ToRegister(instr->TempAt(0));
+  ASSERT(temp.is(t0));
+  __ li(InstanceofStub::right(), Operand(instr->function()));
+  static const int kAdditionalDelta = 7;
+  int delta = masm_->InstructionsGeneratedSince(map_check) + kAdditionalDelta;
+  Label before_push_delta;
+  __ bind(&before_push_delta);
+  {
+    Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
+    __ li(temp, Operand(delta * kPointerSize), true);
+    __ StoreToSafepointRegisterSlot(temp, temp);
+  }
+  CallCodeGeneric(stub.GetCode(),
+                  RelocInfo::CODE_TARGET,
+                  instr,
+                  RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
+  // Put the result value into the result register slot and
+  // restore all registers.
+  __ StoreToSafepointRegisterSlot(result, result);
+}
+
+
+static Condition ComputeCompareCondition(Token::Value op) {
+  switch (op) {
+    case Token::EQ_STRICT:
+    case Token::EQ:
+      return eq;
+    case Token::LT:
+      return lt;
+    case Token::GT:
+      return gt;
+    case Token::LTE:
+      return le;
+    case Token::GTE:
+      return ge;
+    default:
+      UNREACHABLE();
+      return kNoCondition;
+  }
+}
+
+
+void LCodeGen::DoCmpT(LCmpT* instr) {
+  Token::Value op = instr->op();
+
+  Handle<Code> ic = CompareIC::GetUninitialized(op);
+  CallCode(ic, RelocInfo::CODE_TARGET, instr);
+  // On MIPS there is no need for a "no inlined smi code" marker (nop).
+
+  Condition condition = ComputeCompareCondition(op);
+  if (op == Token::GT || op == Token::LTE) {
+    condition = ReverseCondition(condition);
+  }
+  // A minor optimization that relies on LoadRoot always emitting one
+  // instruction.
+  Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm());
+  Label done;
+  __ Branch(USE_DELAY_SLOT, &done, condition, v0, Operand(zero_reg));
+  __ LoadRoot(ToRegister(instr->result()), Heap::kTrueValueRootIndex);
+  __ LoadRoot(ToRegister(instr->result()), Heap::kFalseValueRootIndex);
+  ASSERT_EQ(3, masm()->InstructionsGeneratedSince(&done));
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoReturn(LReturn* instr) {
+  if (FLAG_trace) {
+    // Push the return value on the stack as the parameter.
+    // Runtime::TraceExit returns its parameter in v0.
+    __ push(v0);
+    __ CallRuntime(Runtime::kTraceExit, 1);
+  }
+  int32_t sp_delta = (GetParameterCount() + 1) * kPointerSize;
+  __ mov(sp, fp);
+  __ Pop(ra, fp);
+  __ Addu(sp, sp, Operand(sp_delta));
+  __ Jump(ra);
+}
+
+
+void LCodeGen::DoLoadGlobalCell(LLoadGlobalCell* instr) {
+  Register result = ToRegister(instr->result());
+  __ li(at, Operand(Handle<Object>(instr->hydrogen()->cell())));
+  __ lw(result, FieldMemOperand(at, JSGlobalPropertyCell::kValueOffset));
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
+    DeoptimizeIf(eq, instr->environment(), result, Operand(at));
+  }
+}
+
+
+void LCodeGen::DoLoadGlobalGeneric(LLoadGlobalGeneric* instr) {
+  ASSERT(ToRegister(instr->global_object()).is(a0));
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  __ li(a2, Operand(instr->name()));
+  RelocInfo::Mode mode = instr->for_typeof() ? RelocInfo::CODE_TARGET
+                                             : RelocInfo::CODE_TARGET_CONTEXT;
+  Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+  CallCode(ic, mode, instr);
+}
+
+
+void LCodeGen::DoStoreGlobalCell(LStoreGlobalCell* instr) {
+  Register value = ToRegister(instr->InputAt(0));
+  Register scratch = scratch0();
+  Register scratch2 = ToRegister(instr->TempAt(0));
+
+  // Load the cell.
+  __ li(scratch, Operand(Handle<Object>(instr->hydrogen()->cell())));
+
+  // If the cell we are storing to contains the hole it could have
+  // been deleted from the property dictionary. In that case, we need
+  // to update the property details in the property dictionary to mark
+  // it as no longer deleted.
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ lw(scratch2,
+          FieldMemOperand(scratch, JSGlobalPropertyCell::kValueOffset));
+    __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
+    DeoptimizeIf(eq, instr->environment(), scratch2, Operand(at));
+  }
+
+  // Store the value.
+  __ sw(value, FieldMemOperand(scratch, JSGlobalPropertyCell::kValueOffset));
+
+  // Cells are always in the remembered set.
+  if (instr->hydrogen()->NeedsWriteBarrier()) {
+    HType type = instr->hydrogen()->value()->type();
+    SmiCheck check_needed =
+        type.IsHeapObject() ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
+    __ RecordWriteField(scratch,
+                        JSGlobalPropertyCell::kValueOffset,
+                        value,
+                        scratch2,
+                        kRAHasBeenSaved,
+                        kSaveFPRegs,
+                        OMIT_REMEMBERED_SET,
+                        check_needed);
+  }
+}
+
+
+void LCodeGen::DoStoreGlobalGeneric(LStoreGlobalGeneric* instr) {
+  ASSERT(ToRegister(instr->global_object()).is(a1));
+  ASSERT(ToRegister(instr->value()).is(a0));
+
+  __ li(a2, Operand(instr->name()));
+  Handle<Code> ic = instr->strict_mode()
+      ? isolate()->builtins()->StoreIC_Initialize_Strict()
+      : isolate()->builtins()->StoreIC_Initialize();
+  CallCode(ic, RelocInfo::CODE_TARGET_CONTEXT, instr);
+}
+
+
+void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
+  Register context = ToRegister(instr->context());
+  Register result = ToRegister(instr->result());
+  __ lw(result, ContextOperand(context, instr->slot_index()));
+}
+
+
+void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
+  Register context = ToRegister(instr->context());
+  Register value = ToRegister(instr->value());
+  MemOperand target = ContextOperand(context, instr->slot_index());
+  __ sw(value, target);
+  if (instr->hydrogen()->NeedsWriteBarrier()) {
+    HType type = instr->hydrogen()->value()->type();
+    SmiCheck check_needed =
+        type.IsHeapObject() ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
+    __ RecordWriteContextSlot(context,
+                              target.offset(),
+                              value,
+                              scratch0(),
+                              kRAHasBeenSaved,
+                              kSaveFPRegs,
+                              EMIT_REMEMBERED_SET,
+                              check_needed);
+  }
+}
+
+
+void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
+  Register object = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  if (instr->hydrogen()->is_in_object()) {
+    __ lw(result, FieldMemOperand(object, instr->hydrogen()->offset()));
+  } else {
+    __ lw(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
+    __ lw(result, FieldMemOperand(result, instr->hydrogen()->offset()));
+  }
+}
+
+
+void LCodeGen::EmitLoadFieldOrConstantFunction(Register result,
+                                               Register object,
+                                               Handle<Map> type,
+                                               Handle<String> name) {
+  LookupResult lookup;
+  type->LookupInDescriptors(NULL, *name, &lookup);
+  ASSERT(lookup.IsProperty() &&
+         (lookup.type() == FIELD || lookup.type() == CONSTANT_FUNCTION));
+  if (lookup.type() == FIELD) {
+    int index = lookup.GetLocalFieldIndexFromMap(*type);
+    int offset = index * kPointerSize;
+    if (index < 0) {
+      // Negative property indices are in-object properties, indexed
+      // from the end of the fixed part of the object.
+      __ lw(result, FieldMemOperand(object, offset + type->instance_size()));
+    } else {
+      // Non-negative property indices are in the properties array.
+      __ lw(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
+      __ lw(result, FieldMemOperand(result, offset + FixedArray::kHeaderSize));
+    }
+  } else {
+    Handle<JSFunction> function(lookup.GetConstantFunctionFromMap(*type));
+    LoadHeapObject(result, Handle<HeapObject>::cast(function));
+  }
+}
+
+
+void LCodeGen::DoLoadNamedFieldPolymorphic(LLoadNamedFieldPolymorphic* instr) {
+  Register object = ToRegister(instr->object());
+  Register result = ToRegister(instr->result());
+  Register scratch = scratch0();
+  int map_count = instr->hydrogen()->types()->length();
+  Handle<String> name = instr->hydrogen()->name();
+  if (map_count == 0) {
+    ASSERT(instr->hydrogen()->need_generic());
+    __ li(a2, Operand(name));
+    Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+    CallCode(ic, RelocInfo::CODE_TARGET, instr);
+  } else {
+    Label done;
+    __ lw(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+    for (int i = 0; i < map_count - 1; ++i) {
+      Handle<Map> map = instr->hydrogen()->types()->at(i);
+      Label next;
+      __ Branch(&next, ne, scratch, Operand(map));
+      EmitLoadFieldOrConstantFunction(result, object, map, name);
+      __ Branch(&done);
+      __ bind(&next);
+    }
+    Handle<Map> map = instr->hydrogen()->types()->last();
+    if (instr->hydrogen()->need_generic()) {
+      Label generic;
+      __ Branch(&generic, ne, scratch, Operand(map));
+      EmitLoadFieldOrConstantFunction(result, object, map, name);
+      __ Branch(&done);
+      __ bind(&generic);
+      __ li(a2, Operand(name));
+      Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+      CallCode(ic, RelocInfo::CODE_TARGET, instr);
+    } else {
+      DeoptimizeIf(ne, instr->environment(), scratch, Operand(map));
+      EmitLoadFieldOrConstantFunction(result, object, map, name);
+    }
+    __ bind(&done);
+  }
+}
+
+
+void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) {
+  ASSERT(ToRegister(instr->object()).is(a0));
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  // Name is always in a2.
+  __ li(a2, Operand(instr->name()));
+  Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
+  CallCode(ic, RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoLoadFunctionPrototype(LLoadFunctionPrototype* instr) {
+  Register scratch = scratch0();
+  Register function = ToRegister(instr->function());
+  Register result = ToRegister(instr->result());
+
+  // Check that the function really is a function. Load map into the
+  // result register.
+  __ GetObjectType(function, result, scratch);
+  DeoptimizeIf(ne, instr->environment(), scratch, Operand(JS_FUNCTION_TYPE));
+
+  // Make sure that the function has an instance prototype.
+  Label non_instance;
+  __ lbu(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
+  __ And(scratch, scratch, Operand(1 << Map::kHasNonInstancePrototype));
+  __ Branch(&non_instance, ne, scratch, Operand(zero_reg));
+
+  // Get the prototype or initial map from the function.
+  __ lw(result,
+         FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+
+  // Check that the function has a prototype or an initial map.
+  __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
+  DeoptimizeIf(eq, instr->environment(), result, Operand(at));
+
+  // If the function does not have an initial map, we're done.
+  Label done;
+  __ GetObjectType(result, scratch, scratch);
+  __ Branch(&done, ne, scratch, Operand(MAP_TYPE));
+
+  // Get the prototype from the initial map.
+  __ lw(result, FieldMemOperand(result, Map::kPrototypeOffset));
+  __ Branch(&done);
+
+  // Non-instance prototype: Fetch prototype from constructor field
+  // in initial map.
+  __ bind(&non_instance);
+  __ lw(result, FieldMemOperand(result, Map::kConstructorOffset));
+
+  // All done.
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoLoadElements(LLoadElements* instr) {
+  Register result = ToRegister(instr->result());
+  Register input = ToRegister(instr->InputAt(0));
+  Register scratch = scratch0();
+
+  __ lw(result, FieldMemOperand(input, JSObject::kElementsOffset));
+  if (FLAG_debug_code) {
+    Label done, fail;
+    __ lw(scratch, FieldMemOperand(result, HeapObject::kMapOffset));
+    __ LoadRoot(at, Heap::kFixedArrayMapRootIndex);
+    __ Branch(USE_DELAY_SLOT, &done, eq, scratch, Operand(at));
+    __ LoadRoot(at, Heap::kFixedCOWArrayMapRootIndex);  // In the delay slot.
+    __ Branch(&done, eq, scratch, Operand(at));
+    // |scratch| still contains |input|'s map.
+    __ lbu(scratch, FieldMemOperand(scratch, Map::kBitField2Offset));
+    __ Ext(scratch, scratch, Map::kElementsKindShift,
+           Map::kElementsKindBitCount);
+    __ Branch(&done, eq, scratch,
+              Operand(FAST_ELEMENTS));
+    __ Branch(&fail, lt, scratch,
+              Operand(FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND));
+    __ Branch(&done, le, scratch,
+              Operand(LAST_EXTERNAL_ARRAY_ELEMENTS_KIND));
+    __ bind(&fail);
+    __ Abort("Check for fast or external elements failed.");
+    __ bind(&done);
+  }
+}
+
+
+void LCodeGen::DoLoadExternalArrayPointer(
+    LLoadExternalArrayPointer* instr) {
+  Register to_reg = ToRegister(instr->result());
+  Register from_reg  = ToRegister(instr->InputAt(0));
+  __ lw(to_reg, FieldMemOperand(from_reg,
+                                ExternalArray::kExternalPointerOffset));
+}
+
+
+void LCodeGen::DoAccessArgumentsAt(LAccessArgumentsAt* instr) {
+  Register arguments = ToRegister(instr->arguments());
+  Register length = ToRegister(instr->length());
+  Register index = ToRegister(instr->index());
+  Register result = ToRegister(instr->result());
+
+  // Bailout index is not a valid argument index. Use unsigned check to get
+  // negative check for free.
+
+  // TODO(plind): Shoud be optimized to do the sub before the DeoptimizeIf(),
+  // as they do in Arm. It will save us an instruction.
+  DeoptimizeIf(ls, instr->environment(), length, Operand(index));
+
+  // There are two words between the frame pointer and the last argument.
+  // Subtracting from length accounts for one of them, add one more.
+  __ subu(length, length, index);
+  __ Addu(length, length, Operand(1));
+  __ sll(length, length, kPointerSizeLog2);
+  __ Addu(at, arguments, Operand(length));
+  __ lw(result, MemOperand(at, 0));
+}
+
+
+void LCodeGen::DoLoadKeyedFastElement(LLoadKeyedFastElement* instr) {
+  Register elements = ToRegister(instr->elements());
+  Register key = EmitLoadRegister(instr->key(), scratch0());
+  Register result = ToRegister(instr->result());
+  Register scratch = scratch0();
+
+  // Load the result.
+  __ sll(scratch, key, kPointerSizeLog2);  // Key indexes words.
+  __ addu(scratch, elements, scratch);
+  __ lw(result, FieldMemOperand(scratch, FixedArray::kHeaderSize));
+
+  // Check for the hole value.
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
+    DeoptimizeIf(eq, instr->environment(), result, Operand(scratch));
+  }
+}
+
+
+void LCodeGen::DoLoadKeyedFastDoubleElement(
+    LLoadKeyedFastDoubleElement* instr) {
+  Register elements = ToRegister(instr->elements());
+  bool key_is_constant = instr->key()->IsConstantOperand();
+  Register key = no_reg;
+  DoubleRegister result = ToDoubleRegister(instr->result());
+  Register scratch = scratch0();
+
+  int shift_size =
+      ElementsKindToShiftSize(FAST_DOUBLE_ELEMENTS);
+  int constant_key = 0;
+  if (key_is_constant) {
+    constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
+    if (constant_key & 0xF0000000) {
+      Abort("array index constant value too big.");
+    }
+  } else {
+    key = ToRegister(instr->key());
+  }
+
+  if (key_is_constant) {
+    __ Addu(elements, elements, Operand(constant_key * (1 << shift_size) +
+            FixedDoubleArray::kHeaderSize - kHeapObjectTag));
+  } else {
+    __ sll(scratch, key, shift_size);
+    __ Addu(elements, elements, Operand(scratch));
+    __ Addu(elements, elements,
+            Operand(FixedDoubleArray::kHeaderSize - kHeapObjectTag));
+  }
+
+  __ lw(scratch, MemOperand(elements, sizeof(kHoleNanLower32)));
+  DeoptimizeIf(eq, instr->environment(), scratch, Operand(kHoleNanUpper32));
+
+  __ ldc1(result, MemOperand(elements));
+}
+
+
+void LCodeGen::DoLoadKeyedSpecializedArrayElement(
+    LLoadKeyedSpecializedArrayElement* instr) {
+  Register external_pointer = ToRegister(instr->external_pointer());
+  Register key = no_reg;
+  ElementsKind elements_kind = instr->elements_kind();
+  bool key_is_constant = instr->key()->IsConstantOperand();
+  int constant_key = 0;
+  if (key_is_constant) {
+    constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
+    if (constant_key & 0xF0000000) {
+      Abort("array index constant value too big.");
+    }
+  } else {
+    key = ToRegister(instr->key());
+  }
+  int shift_size = ElementsKindToShiftSize(elements_kind);
+
+  if (elements_kind == EXTERNAL_FLOAT_ELEMENTS ||
+      elements_kind == EXTERNAL_DOUBLE_ELEMENTS) {
+    FPURegister result = ToDoubleRegister(instr->result());
+    if (key_is_constant) {
+      __ Addu(scratch0(), external_pointer, constant_key * (1 << shift_size));
+    } else {
+      __ sll(scratch0(), key, shift_size);
+      __ Addu(scratch0(), scratch0(), external_pointer);
+    }
+
+    if (elements_kind == EXTERNAL_FLOAT_ELEMENTS) {
+      __ lwc1(result, MemOperand(scratch0()));
+      __ cvt_d_s(result, result);
+    } else  {  // i.e. elements_kind == EXTERNAL_DOUBLE_ELEMENTS
+      __ ldc1(result, MemOperand(scratch0()));
+    }
+  } else {
+    Register result = ToRegister(instr->result());
+    Register scratch = scratch0();
+    MemOperand mem_operand(zero_reg);
+    if (key_is_constant) {
+      mem_operand = MemOperand(external_pointer,
+                               constant_key * (1 << shift_size));
+    } else {
+      __ sll(scratch, key, shift_size);
+      __ Addu(scratch, scratch, external_pointer);
+      mem_operand = MemOperand(scratch);
+    }
+    switch (elements_kind) {
+      case EXTERNAL_BYTE_ELEMENTS:
+        __ lb(result, mem_operand);
+        break;
+      case EXTERNAL_PIXEL_ELEMENTS:
+      case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
+        __ lbu(result, mem_operand);
+        break;
+      case EXTERNAL_SHORT_ELEMENTS:
+        __ lh(result, mem_operand);
+        break;
+      case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
+        __ lhu(result, mem_operand);
+        break;
+      case EXTERNAL_INT_ELEMENTS:
+        __ lw(result, mem_operand);
+        break;
+      case EXTERNAL_UNSIGNED_INT_ELEMENTS:
+        __ lw(result, mem_operand);
+        // TODO(danno): we could be more clever here, perhaps having a special
+        // version of the stub that detects if the overflow case actually
+        // happens, and generate code that returns a double rather than int.
+        DeoptimizeIf(Ugreater_equal, instr->environment(),
+            result, Operand(0x80000000));
+        break;
+      case EXTERNAL_FLOAT_ELEMENTS:
+      case EXTERNAL_DOUBLE_ELEMENTS:
+      case FAST_DOUBLE_ELEMENTS:
+      case FAST_ELEMENTS:
+      case FAST_SMI_ONLY_ELEMENTS:
+      case DICTIONARY_ELEMENTS:
+      case NON_STRICT_ARGUMENTS_ELEMENTS:
+        UNREACHABLE();
+        break;
+    }
+  }
+}
+
+
+void LCodeGen::DoLoadKeyedGeneric(LLoadKeyedGeneric* instr) {
+  ASSERT(ToRegister(instr->object()).is(a1));
+  ASSERT(ToRegister(instr->key()).is(a0));
+
+  Handle<Code> ic = isolate()->builtins()->KeyedLoadIC_Initialize();
+  CallCode(ic, RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoArgumentsElements(LArgumentsElements* instr) {
+  Register scratch = scratch0();
+  Register temp = scratch1();
+  Register result = ToRegister(instr->result());
+
+  // Check if the calling frame is an arguments adaptor frame.
+  Label done, adapted;
+  __ lw(scratch, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ lw(result, MemOperand(scratch, StandardFrameConstants::kContextOffset));
+  __ Xor(temp, result, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
+
+  // Result is the frame pointer for the frame if not adapted and for the real
+  // frame below the adaptor frame if adapted.
+  __ movn(result, fp, temp);  // move only if temp is not equal to zero (ne)
+  __ movz(result, scratch, temp);  // move only if temp is equal to zero (eq)
+}
+
+
+void LCodeGen::DoArgumentsLength(LArgumentsLength* instr) {
+  Register elem = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+
+  Label done;
+
+  // If no arguments adaptor frame the number of arguments is fixed.
+  __ Addu(result, zero_reg, Operand(scope()->num_parameters()));
+  __ Branch(&done, eq, fp, Operand(elem));
+
+  // Arguments adaptor frame present. Get argument length from there.
+  __ lw(result, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ lw(result,
+        MemOperand(result, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ SmiUntag(result);
+
+  // Argument length is in result register.
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoApplyArguments(LApplyArguments* instr) {
+  Register receiver = ToRegister(instr->receiver());
+  Register function = ToRegister(instr->function());
+  Register length = ToRegister(instr->length());
+  Register elements = ToRegister(instr->elements());
+  Register scratch = scratch0();
+  ASSERT(receiver.is(a0));  // Used for parameter count.
+  ASSERT(function.is(a1));  // Required by InvokeFunction.
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  // If the receiver is null or undefined, we have to pass the global
+  // object as a receiver to normal functions. Values have to be
+  // passed unchanged to builtins and strict-mode functions.
+  Label global_object, receiver_ok;
+
+  // Do not transform the receiver to object for strict mode
+  // functions.
+  __ lw(scratch,
+         FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
+  __ lw(scratch,
+         FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
+
+  // Do not transform the receiver to object for builtins.
+  int32_t strict_mode_function_mask =
+                  1 <<  (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize);
+  int32_t native_mask = 1 << (SharedFunctionInfo::kNative + kSmiTagSize);
+  __ And(scratch, scratch, Operand(strict_mode_function_mask | native_mask));
+  __ Branch(&receiver_ok, ne, scratch, Operand(zero_reg));
+
+  // Normal function. Replace undefined or null with global receiver.
+  __ LoadRoot(scratch, Heap::kNullValueRootIndex);
+  __ Branch(&global_object, eq, receiver, Operand(scratch));
+  __ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
+  __ Branch(&global_object, eq, receiver, Operand(scratch));
+
+  // Deoptimize if the receiver is not a JS object.
+  __ And(scratch, receiver, Operand(kSmiTagMask));
+  DeoptimizeIf(eq, instr->environment(), scratch, Operand(zero_reg));
+
+  __ GetObjectType(receiver, scratch, scratch);
+  DeoptimizeIf(lt, instr->environment(),
+               scratch, Operand(FIRST_SPEC_OBJECT_TYPE));
+  __ Branch(&receiver_ok);
+
+  __ bind(&global_object);
+  __ lw(receiver, GlobalObjectOperand());
+  __ lw(receiver,
+         FieldMemOperand(receiver, JSGlobalObject::kGlobalReceiverOffset));
+  __ bind(&receiver_ok);
+
+  // Copy the arguments to this function possibly from the
+  // adaptor frame below it.
+  const uint32_t kArgumentsLimit = 1 * KB;
+  DeoptimizeIf(hi, instr->environment(), length, Operand(kArgumentsLimit));
+
+  // Push the receiver and use the register to keep the original
+  // number of arguments.
+  __ push(receiver);
+  __ Move(receiver, length);
+  // The arguments are at a one pointer size offset from elements.
+  __ Addu(elements, elements, Operand(1 * kPointerSize));
+
+  // Loop through the arguments pushing them onto the execution
+  // stack.
+  Label invoke, loop;
+  // length is a small non-negative integer, due to the test above.
+  __ Branch(USE_DELAY_SLOT, &invoke, eq, length, Operand(zero_reg));
+  __ sll(scratch, length, 2);
+  __ bind(&loop);
+  __ Addu(scratch, elements, scratch);
+  __ lw(scratch, MemOperand(scratch));
+  __ push(scratch);
+  __ Subu(length, length, Operand(1));
+  __ Branch(USE_DELAY_SLOT, &loop, ne, length, Operand(zero_reg));
+  __ sll(scratch, length, 2);
+
+  __ bind(&invoke);
+  ASSERT(instr->HasPointerMap() && instr->HasDeoptimizationEnvironment());
+  LPointerMap* pointers = instr->pointer_map();
+  LEnvironment* env = instr->deoptimization_environment();
+  RecordPosition(pointers->position());
+  RegisterEnvironmentForDeoptimization(env);
+  SafepointGenerator safepoint_generator(this,
+                                         pointers,
+                                         env->deoptimization_index());
+  // The number of arguments is stored in receiver which is a0, as expected
+  // by InvokeFunction.
+  v8::internal::ParameterCount actual(receiver);
+  __ InvokeFunction(function, actual, CALL_FUNCTION,
+                    safepoint_generator, CALL_AS_METHOD);
+  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoPushArgument(LPushArgument* instr) {
+  LOperand* argument = instr->InputAt(0);
+  if (argument->IsDoubleRegister() || argument->IsDoubleStackSlot()) {
+    Abort("DoPushArgument not implemented for double type.");
+  } else {
+    Register argument_reg = EmitLoadRegister(argument, at);
+    __ push(argument_reg);
+  }
+}
+
+
+void LCodeGen::DoThisFunction(LThisFunction* instr) {
+  Register result = ToRegister(instr->result());
+  __ lw(result, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+}
+
+
+void LCodeGen::DoContext(LContext* instr) {
+  Register result = ToRegister(instr->result());
+  __ mov(result, cp);
+}
+
+
+void LCodeGen::DoOuterContext(LOuterContext* instr) {
+  Register context = ToRegister(instr->context());
+  Register result = ToRegister(instr->result());
+  __ lw(result,
+        MemOperand(context, Context::SlotOffset(Context::PREVIOUS_INDEX)));
+}
+
+
+void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
+  Register context = ToRegister(instr->context());
+  Register result = ToRegister(instr->result());
+  __ lw(result, ContextOperand(cp, Context::GLOBAL_INDEX));
+}
+
+
+void LCodeGen::DoGlobalReceiver(LGlobalReceiver* instr) {
+  Register global = ToRegister(instr->global());
+  Register result = ToRegister(instr->result());
+  __ lw(result, FieldMemOperand(global, GlobalObject::kGlobalReceiverOffset));
+}
+
+
+void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
+                                 int arity,
+                                 LInstruction* instr,
+                                 CallKind call_kind) {
+  // Change context if needed.
+  bool change_context =
+      (info()->closure()->context() != function->context()) ||
+      scope()->contains_with() ||
+      (scope()->num_heap_slots() > 0);
+  if (change_context) {
+    __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+  }
+
+  // Set a0 to arguments count if adaption is not needed. Assumes that a0
+  // is available to write to at this point.
+  if (!function->NeedsArgumentsAdaption()) {
+    __ li(a0, Operand(arity));
+  }
+
+  LPointerMap* pointers = instr->pointer_map();
+  RecordPosition(pointers->position());
+
+  // Invoke function.
+  __ SetCallKind(t1, call_kind);
+  __ lw(at, FieldMemOperand(a1, JSFunction::kCodeEntryOffset));
+  __ Call(at);
+
+  // Setup deoptimization.
+  RegisterLazyDeoptimization(instr, RECORD_SIMPLE_SAFEPOINT);
+
+  // Restore context.
+  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoCallConstantFunction(LCallConstantFunction* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+  __ mov(a0, v0);
+  __ li(a1, Operand(instr->function()));
+  CallKnownFunction(instr->function(), instr->arity(), instr, CALL_AS_METHOD);
+}
+
+
+void LCodeGen::DoDeferredMathAbsTaggedHeapNumber(LUnaryMathOperation* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  Register scratch = scratch0();
+
+  // Deoptimize if not a heap number.
+  __ lw(scratch, FieldMemOperand(input, HeapObject::kMapOffset));
+  __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+  DeoptimizeIf(ne, instr->environment(), scratch, Operand(at));
+
+  Label done;
+  Register exponent = scratch0();
+  scratch = no_reg;
+  __ lw(exponent, FieldMemOperand(input, HeapNumber::kExponentOffset));
+  // Check the sign of the argument. If the argument is positive, just
+  // return it.
+  __ Move(result, input);
+  __ And(at, exponent, Operand(HeapNumber::kSignMask));
+  __ Branch(&done, eq, at, Operand(zero_reg));
+
+  // Input is negative. Reverse its sign.
+  // Preserve the value of all registers.
+  {
+    PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
+
+    // Registers were saved at the safepoint, so we can use
+    // many scratch registers.
+    Register tmp1 = input.is(a1) ? a0 : a1;
+    Register tmp2 = input.is(a2) ? a0 : a2;
+    Register tmp3 = input.is(a3) ? a0 : a3;
+    Register tmp4 = input.is(t0) ? a0 : t0;
+
+    // exponent: floating point exponent value.
+
+    Label allocated, slow;
+    __ LoadRoot(tmp4, Heap::kHeapNumberMapRootIndex);
+    __ AllocateHeapNumber(tmp1, tmp2, tmp3, tmp4, &slow);
+    __ Branch(&allocated);
+
+    // Slow case: Call the runtime system to do the number allocation.
+    __ bind(&slow);
+
+    CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
+    // Set the pointer to the new heap number in tmp.
+    if (!tmp1.is(v0))
+      __ mov(tmp1, v0);
+    // Restore input_reg after call to runtime.
+    __ LoadFromSafepointRegisterSlot(input, input);
+    __ lw(exponent, FieldMemOperand(input, HeapNumber::kExponentOffset));
+
+    __ bind(&allocated);
+    // exponent: floating point exponent value.
+    // tmp1: allocated heap number.
+    __ And(exponent, exponent, Operand(~HeapNumber::kSignMask));
+    __ sw(exponent, FieldMemOperand(tmp1, HeapNumber::kExponentOffset));
+    __ lw(tmp2, FieldMemOperand(input, HeapNumber::kMantissaOffset));
+    __ sw(tmp2, FieldMemOperand(tmp1, HeapNumber::kMantissaOffset));
+
+    __ StoreToSafepointRegisterSlot(tmp1, result);
+  }
+
+  __ bind(&done);
+}
+
+
+void LCodeGen::EmitIntegerMathAbs(LUnaryMathOperation* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
+  Label done;
+  __ Branch(USE_DELAY_SLOT, &done, ge, input, Operand(zero_reg));
+  __ mov(result, input);
+  ASSERT_EQ(2, masm()->InstructionsGeneratedSince(&done));
+  __ subu(result, zero_reg, input);
+  // Overflow if result is still negative, ie 0x80000000.
+  DeoptimizeIf(lt, instr->environment(), result, Operand(zero_reg));
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoMathAbs(LUnaryMathOperation* instr) {
+  // Class for deferred case.
+  class DeferredMathAbsTaggedHeapNumber: public LDeferredCode {
+   public:
+    DeferredMathAbsTaggedHeapNumber(LCodeGen* codegen,
+                                    LUnaryMathOperation* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() {
+      codegen()->DoDeferredMathAbsTaggedHeapNumber(instr_);
+    }
+    virtual LInstruction* instr() { return instr_; }
+   private:
+    LUnaryMathOperation* instr_;
+  };
+
+  Representation r = instr->hydrogen()->value()->representation();
+  if (r.IsDouble()) {
+    FPURegister input = ToDoubleRegister(instr->InputAt(0));
+    FPURegister result = ToDoubleRegister(instr->result());
+    __ abs_d(result, input);
+  } else if (r.IsInteger32()) {
+    EmitIntegerMathAbs(instr);
+  } else {
+    // Representation is tagged.
+    DeferredMathAbsTaggedHeapNumber* deferred =
+        new DeferredMathAbsTaggedHeapNumber(this, instr);
+    Register input = ToRegister(instr->InputAt(0));
+    // Smi check.
+    __ JumpIfNotSmi(input, deferred->entry());
+    // If smi, handle it directly.
+    EmitIntegerMathAbs(instr);
+    __ bind(deferred->exit());
+  }
+}
+
+
+void LCodeGen::DoMathFloor(LUnaryMathOperation* instr) {
+  DoubleRegister input = ToDoubleRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  FPURegister single_scratch = double_scratch0().low();
+  Register scratch1 = scratch0();
+  Register except_flag = ToRegister(instr->TempAt(0));
+
+  __ EmitFPUTruncate(kRoundToMinusInf,
+                     single_scratch,
+                     input,
+                     scratch1,
+                     except_flag);
+
+  // Deopt if the operation did not succeed.
+  DeoptimizeIf(ne, instr->environment(), except_flag, Operand(zero_reg));
+
+  // Load the result.
+  __ mfc1(result, single_scratch);
+
+  if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    // Test for -0.
+    Label done;
+    __ Branch(&done, ne, result, Operand(zero_reg));
+    __ mfc1(scratch1, input.high());
+    __ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
+    DeoptimizeIf(ne, instr->environment(), scratch1, Operand(zero_reg));
+    __ bind(&done);
+  }
+}
+
+
+void LCodeGen::DoMathRound(LUnaryMathOperation* instr) {
+  DoubleRegister input = ToDoubleRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  Register scratch = scratch0();
+  Label done, check_sign_on_zero;
+
+  // Extract exponent bits.
+  __ mfc1(result, input.high());
+  __ Ext(scratch,
+         result,
+         HeapNumber::kExponentShift,
+         HeapNumber::kExponentBits);
+
+  // If the number is in ]-0.5, +0.5[, the result is +/- 0.
+  Label skip1;
+  __ Branch(&skip1, gt, scratch, Operand(HeapNumber::kExponentBias - 2));
+  __ mov(result, zero_reg);
+  if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    __ Branch(&check_sign_on_zero);
+  } else {
+    __ Branch(&done);
+  }
+  __ bind(&skip1);
+
+  // The following conversion will not work with numbers
+  // outside of ]-2^32, 2^32[.
+  DeoptimizeIf(ge, instr->environment(), scratch,
+               Operand(HeapNumber::kExponentBias + 32));
+
+  // Save the original sign for later comparison.
+  __ And(scratch, result, Operand(HeapNumber::kSignMask));
+
+  __ Move(double_scratch0(), 0.5);
+  __ add_d(input, input, double_scratch0());
+
+  // Check sign of the result: if the sign changed, the input
+  // value was in ]0.5, 0[ and the result should be -0.
+  __ mfc1(result, input.high());
+  __ Xor(result, result, Operand(scratch));
+  if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    // ARM uses 'mi' here, which is 'lt'
+    DeoptimizeIf(lt, instr->environment(), result,
+                 Operand(zero_reg));
+  } else {
+    Label skip2;
+    // ARM uses 'mi' here, which is 'lt'
+    // Negating it results in 'ge'
+    __ Branch(&skip2, ge, result, Operand(zero_reg));
+    __ mov(result, zero_reg);
+    __ Branch(&done);
+    __ bind(&skip2);
+  }
+
+  Register except_flag = scratch;
+
+  __ EmitFPUTruncate(kRoundToMinusInf,
+                     double_scratch0().low(),
+                     input,
+                     result,
+                     except_flag);
+
+  DeoptimizeIf(ne, instr->environment(), except_flag, Operand(zero_reg));
+
+  __ mfc1(result, double_scratch0().low());
+
+  if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    // Test for -0.
+    __ Branch(&done, ne, result, Operand(zero_reg));
+    __ bind(&check_sign_on_zero);
+    __ mfc1(scratch, input.high());
+    __ And(scratch, scratch, Operand(HeapNumber::kSignMask));
+    DeoptimizeIf(ne, instr->environment(), scratch, Operand(zero_reg));
+  }
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoMathSqrt(LUnaryMathOperation* instr) {
+  DoubleRegister input = ToDoubleRegister(instr->InputAt(0));
+  DoubleRegister result = ToDoubleRegister(instr->result());
+  __ sqrt_d(result, input);
+}
+
+
+void LCodeGen::DoMathPowHalf(LUnaryMathOperation* instr) {
+  DoubleRegister input = ToDoubleRegister(instr->InputAt(0));
+  DoubleRegister result = ToDoubleRegister(instr->result());
+  DoubleRegister double_scratch = double_scratch0();
+
+  // Add +0 to convert -0 to +0.
+  __ mtc1(zero_reg, double_scratch.low());
+  __ mtc1(zero_reg, double_scratch.high());
+  __ add_d(result, input, double_scratch);
+  __ sqrt_d(result, result);
+}
+
+
+void LCodeGen::DoPower(LPower* instr) {
+  LOperand* left = instr->InputAt(0);
+  LOperand* right = instr->InputAt(1);
+  Register scratch = scratch0();
+  DoubleRegister result_reg = ToDoubleRegister(instr->result());
+  Representation exponent_type = instr->hydrogen()->right()->representation();
+  if (exponent_type.IsDouble()) {
+    // Prepare arguments and call C function.
+    __ PrepareCallCFunction(0, 2, scratch);
+    __ SetCallCDoubleArguments(ToDoubleRegister(left),
+                               ToDoubleRegister(right));
+    __ CallCFunction(
+        ExternalReference::power_double_double_function(isolate()), 0, 2);
+  } else if (exponent_type.IsInteger32()) {
+    ASSERT(ToRegister(right).is(a0));
+    // Prepare arguments and call C function.
+    __ PrepareCallCFunction(1, 1, scratch);
+    __ SetCallCDoubleArguments(ToDoubleRegister(left), ToRegister(right));
+    __ CallCFunction(
+        ExternalReference::power_double_int_function(isolate()), 1, 1);
+  } else {
+    ASSERT(exponent_type.IsTagged());
+    ASSERT(instr->hydrogen()->left()->representation().IsDouble());
+
+    Register right_reg = ToRegister(right);
+
+    // Check for smi on the right hand side.
+    Label non_smi, call;
+    __ JumpIfNotSmi(right_reg, &non_smi);
+
+    // Untag smi and convert it to a double.
+    __ SmiUntag(right_reg);
+    FPURegister single_scratch = double_scratch0();
+    __ mtc1(right_reg, single_scratch);
+    __ cvt_d_w(result_reg, single_scratch);
+    __ Branch(&call);
+
+    // Heap number map check.
+    __ bind(&non_smi);
+    __ lw(scratch, FieldMemOperand(right_reg, HeapObject::kMapOffset));
+    __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+    DeoptimizeIf(ne, instr->environment(), scratch, Operand(at));
+    __ ldc1(result_reg, FieldMemOperand(right_reg, HeapNumber::kValueOffset));
+
+    // Prepare arguments and call C function.
+    __ bind(&call);
+    __ PrepareCallCFunction(0, 2, scratch);
+    __ SetCallCDoubleArguments(ToDoubleRegister(left), result_reg);
+    __ CallCFunction(
+        ExternalReference::power_double_double_function(isolate()), 0, 2);
+  }
+  // Store the result in the result register.
+  __ GetCFunctionDoubleResult(result_reg);
+}
+
+
+void LCodeGen::DoMathLog(LUnaryMathOperation* instr) {
+  ASSERT(ToDoubleRegister(instr->result()).is(f4));
+  TranscendentalCacheStub stub(TranscendentalCache::LOG,
+                               TranscendentalCacheStub::UNTAGGED);
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoMathCos(LUnaryMathOperation* instr) {
+  ASSERT(ToDoubleRegister(instr->result()).is(f4));
+  TranscendentalCacheStub stub(TranscendentalCache::COS,
+                               TranscendentalCacheStub::UNTAGGED);
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoMathSin(LUnaryMathOperation* instr) {
+  ASSERT(ToDoubleRegister(instr->result()).is(f4));
+  TranscendentalCacheStub stub(TranscendentalCache::SIN,
+                               TranscendentalCacheStub::UNTAGGED);
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoUnaryMathOperation(LUnaryMathOperation* instr) {
+  switch (instr->op()) {
+    case kMathAbs:
+      DoMathAbs(instr);
+      break;
+    case kMathFloor:
+      DoMathFloor(instr);
+      break;
+    case kMathRound:
+      DoMathRound(instr);
+      break;
+    case kMathSqrt:
+      DoMathSqrt(instr);
+      break;
+    case kMathPowHalf:
+      DoMathPowHalf(instr);
+      break;
+    case kMathCos:
+      DoMathCos(instr);
+      break;
+    case kMathSin:
+      DoMathSin(instr);
+      break;
+    case kMathLog:
+      DoMathLog(instr);
+      break;
+    default:
+      Abort("Unimplemented type of LUnaryMathOperation.");
+      UNREACHABLE();
+  }
+}
+
+
+void LCodeGen::DoInvokeFunction(LInvokeFunction* instr) {
+  ASSERT(ToRegister(instr->function()).is(a1));
+  ASSERT(instr->HasPointerMap());
+  ASSERT(instr->HasDeoptimizationEnvironment());
+  LPointerMap* pointers = instr->pointer_map();
+  LEnvironment* env = instr->deoptimization_environment();
+  RecordPosition(pointers->position());
+  RegisterEnvironmentForDeoptimization(env);
+  SafepointGenerator generator(this, pointers, env->deoptimization_index());
+  ParameterCount count(instr->arity());
+  __ InvokeFunction(a1, count, CALL_FUNCTION, generator, CALL_AS_METHOD);
+  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoCallKeyed(LCallKeyed* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  int arity = instr->arity();
+  Handle<Code> ic =
+      isolate()->stub_cache()->ComputeKeyedCallInitialize(arity);
+  CallCode(ic, RelocInfo::CODE_TARGET, instr);
+  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoCallNamed(LCallNamed* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  int arity = instr->arity();
+  RelocInfo::Mode mode = RelocInfo::CODE_TARGET;
+  Handle<Code> ic =
+      isolate()->stub_cache()->ComputeCallInitialize(arity, mode);
+  __ li(a2, Operand(instr->name()));
+  CallCode(ic, mode, instr);
+  // Restore context register.
+  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoCallFunction(LCallFunction* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  int arity = instr->arity();
+  CallFunctionStub stub(arity, NO_CALL_FUNCTION_FLAGS);
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  __ Drop(1);
+  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoCallGlobal(LCallGlobal* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  int arity = instr->arity();
+  RelocInfo::Mode mode = RelocInfo::CODE_TARGET_CONTEXT;
+  Handle<Code> ic =
+      isolate()->stub_cache()->ComputeCallInitialize(arity, mode);
+  __ li(a2, Operand(instr->name()));
+  CallCode(ic, mode, instr);
+  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoCallKnownGlobal(LCallKnownGlobal* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+  __ li(a1, Operand(instr->target()));
+  CallKnownFunction(instr->target(), instr->arity(), instr, CALL_AS_FUNCTION);
+}
+
+
+void LCodeGen::DoCallNew(LCallNew* instr) {
+  ASSERT(ToRegister(instr->InputAt(0)).is(a1));
+  ASSERT(ToRegister(instr->result()).is(v0));
+
+  Handle<Code> builtin = isolate()->builtins()->JSConstructCall();
+  __ li(a0, Operand(instr->arity()));
+  CallCode(builtin, RelocInfo::CONSTRUCT_CALL, instr);
+}
+
+
+void LCodeGen::DoCallRuntime(LCallRuntime* instr) {
+  CallRuntime(instr->function(), instr->arity(), instr);
+}
+
+
+void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
+  Register object = ToRegister(instr->object());
+  Register value = ToRegister(instr->value());
+  Register scratch = scratch0();
+  int offset = instr->offset();
+
+  ASSERT(!object.is(value));
+
+  if (!instr->transition().is_null()) {
+    __ li(scratch, Operand(instr->transition()));
+    __ sw(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+  }
+
+  // Do the store.
+  HType type = instr->hydrogen()->value()->type();
+  SmiCheck check_needed =
+      type.IsHeapObject() ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
+  if (instr->is_in_object()) {
+    __ sw(value, FieldMemOperand(object, offset));
+    if (instr->hydrogen()->NeedsWriteBarrier()) {
+      // Update the write barrier for the object for in-object properties.
+      __ RecordWriteField(object,
+                          offset,
+                          value,
+                          scratch,
+                          kRAHasBeenSaved,
+                          kSaveFPRegs,
+                          EMIT_REMEMBERED_SET,
+                          check_needed);
+    }
+  } else {
+    __ lw(scratch, FieldMemOperand(object, JSObject::kPropertiesOffset));
+    __ sw(value, FieldMemOperand(scratch, offset));
+    if (instr->hydrogen()->NeedsWriteBarrier()) {
+      // Update the write barrier for the properties array.
+      // object is used as a scratch register.
+      __ RecordWriteField(scratch,
+                          offset,
+                          value,
+                          object,
+                          kRAHasBeenSaved,
+                          kSaveFPRegs,
+                          EMIT_REMEMBERED_SET,
+                          check_needed);
+    }
+  }
+}
+
+
+void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
+  ASSERT(ToRegister(instr->object()).is(a1));
+  ASSERT(ToRegister(instr->value()).is(a0));
+
+  // Name is always in a2.
+  __ li(a2, Operand(instr->name()));
+  Handle<Code> ic = instr->strict_mode()
+      ? isolate()->builtins()->StoreIC_Initialize_Strict()
+      : isolate()->builtins()->StoreIC_Initialize();
+  CallCode(ic, RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
+  DeoptimizeIf(hs,
+               instr->environment(),
+               ToRegister(instr->index()),
+               Operand(ToRegister(instr->length())));
+}
+
+
+void LCodeGen::DoStoreKeyedFastElement(LStoreKeyedFastElement* instr) {
+  Register value = ToRegister(instr->value());
+  Register elements = ToRegister(instr->object());
+  Register key = instr->key()->IsRegister() ? ToRegister(instr->key()) : no_reg;
+  Register scratch = scratch0();
+
+  // This instruction cannot handle the FAST_SMI_ONLY_ELEMENTS -> FAST_ELEMENTS
+  // conversion, so it deopts in that case.
+  if (instr->hydrogen()->ValueNeedsSmiCheck()) {
+    __ And(at, value, Operand(kSmiTagMask));
+    DeoptimizeIf(ne, instr->environment(), at, Operand(zero_reg));
+  }
+
+  // Do the store.
+  if (instr->key()->IsConstantOperand()) {
+    ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
+    LConstantOperand* const_operand = LConstantOperand::cast(instr->key());
+    int offset =
+        ToInteger32(const_operand) * kPointerSize + FixedArray::kHeaderSize;
+    __ sw(value, FieldMemOperand(elements, offset));
+  } else {
+    __ sll(scratch, key, kPointerSizeLog2);
+    __ addu(scratch, elements, scratch);
+    __ sw(value, FieldMemOperand(scratch, FixedArray::kHeaderSize));
+  }
+
+  if (instr->hydrogen()->NeedsWriteBarrier()) {
+    HType type = instr->hydrogen()->value()->type();
+    SmiCheck check_needed =
+        type.IsHeapObject() ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
+    // Compute address of modified element and store it into key register.
+    __ Addu(key, scratch, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+    __ RecordWrite(elements,
+                   key,
+                   value,
+                   kRAHasBeenSaved,
+                   kSaveFPRegs,
+                   EMIT_REMEMBERED_SET,
+                   check_needed);
+  }
+}
+
+
+void LCodeGen::DoStoreKeyedFastDoubleElement(
+    LStoreKeyedFastDoubleElement* instr) {
+  DoubleRegister value = ToDoubleRegister(instr->value());
+  Register elements = ToRegister(instr->elements());
+  Register key = no_reg;
+  Register scratch = scratch0();
+  bool key_is_constant = instr->key()->IsConstantOperand();
+  int constant_key = 0;
+  Label not_nan;
+
+  // Calculate the effective address of the slot in the array to store the
+  // double value.
+  if (key_is_constant) {
+    constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
+    if (constant_key & 0xF0000000) {
+      Abort("array index constant value too big.");
+    }
+  } else {
+    key = ToRegister(instr->key());
+  }
+  int shift_size = ElementsKindToShiftSize(FAST_DOUBLE_ELEMENTS);
+  if (key_is_constant) {
+    __ Addu(scratch, elements, Operand(constant_key * (1 << shift_size) +
+            FixedDoubleArray::kHeaderSize - kHeapObjectTag));
+  } else {
+    __ sll(scratch, key, shift_size);
+    __ Addu(scratch, elements, Operand(scratch));
+    __ Addu(scratch, scratch,
+            Operand(FixedDoubleArray::kHeaderSize - kHeapObjectTag));
+  }
+
+  Label is_nan;
+  // Check for NaN. All NaNs must be canonicalized.
+  __ BranchF(NULL, &is_nan, eq, value, value);
+  __ Branch(&not_nan);
+
+  // Only load canonical NaN if the comparison above set the overflow.
+  __ bind(&is_nan);
+  __ Move(value, FixedDoubleArray::canonical_not_the_hole_nan_as_double());
+
+  __ bind(&not_nan);
+  __ sdc1(value, MemOperand(scratch));
+}
+
+
+void LCodeGen::DoStoreKeyedSpecializedArrayElement(
+    LStoreKeyedSpecializedArrayElement* instr) {
+
+  Register external_pointer = ToRegister(instr->external_pointer());
+  Register key = no_reg;
+  ElementsKind elements_kind = instr->elements_kind();
+  bool key_is_constant = instr->key()->IsConstantOperand();
+  int constant_key = 0;
+  if (key_is_constant) {
+    constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
+    if (constant_key & 0xF0000000) {
+      Abort("array index constant value too big.");
+    }
+  } else {
+    key = ToRegister(instr->key());
+  }
+  int shift_size = ElementsKindToShiftSize(elements_kind);
+
+  if (elements_kind == EXTERNAL_FLOAT_ELEMENTS ||
+      elements_kind == EXTERNAL_DOUBLE_ELEMENTS) {
+    FPURegister value(ToDoubleRegister(instr->value()));
+    if (key_is_constant) {
+      __ Addu(scratch0(), external_pointer, constant_key * (1 << shift_size));
+    } else {
+      __ sll(scratch0(), key, shift_size);
+      __ Addu(scratch0(), scratch0(), external_pointer);
+    }
+
+    if (elements_kind == EXTERNAL_FLOAT_ELEMENTS) {
+      __ cvt_s_d(double_scratch0(), value);
+      __ swc1(double_scratch0(), MemOperand(scratch0()));
+    } else {  // i.e. elements_kind == EXTERNAL_DOUBLE_ELEMENTS
+      __ sdc1(value, MemOperand(scratch0()));
+    }
+  } else {
+    Register value(ToRegister(instr->value()));
+    MemOperand mem_operand(zero_reg);
+    Register scratch = scratch0();
+    if (key_is_constant) {
+      mem_operand = MemOperand(external_pointer,
+                               constant_key * (1 << shift_size));
+    } else {
+      __ sll(scratch, key, shift_size);
+      __ Addu(scratch, scratch, external_pointer);
+      mem_operand = MemOperand(scratch);
+    }
+    switch (elements_kind) {
+      case EXTERNAL_PIXEL_ELEMENTS:
+      case EXTERNAL_BYTE_ELEMENTS:
+      case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
+        __ sb(value, mem_operand);
+        break;
+      case EXTERNAL_SHORT_ELEMENTS:
+      case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
+        __ sh(value, mem_operand);
+        break;
+      case EXTERNAL_INT_ELEMENTS:
+      case EXTERNAL_UNSIGNED_INT_ELEMENTS:
+        __ sw(value, mem_operand);
+        break;
+      case EXTERNAL_FLOAT_ELEMENTS:
+      case EXTERNAL_DOUBLE_ELEMENTS:
+      case FAST_DOUBLE_ELEMENTS:
+      case FAST_ELEMENTS:
+      case FAST_SMI_ONLY_ELEMENTS:
+      case DICTIONARY_ELEMENTS:
+      case NON_STRICT_ARGUMENTS_ELEMENTS:
+        UNREACHABLE();
+        break;
+    }
+  }
+}
+
+void LCodeGen::DoStoreKeyedGeneric(LStoreKeyedGeneric* instr) {
+  ASSERT(ToRegister(instr->object()).is(a2));
+  ASSERT(ToRegister(instr->key()).is(a1));
+  ASSERT(ToRegister(instr->value()).is(a0));
+
+  Handle<Code> ic = instr->strict_mode()
+      ? isolate()->builtins()->KeyedStoreIC_Initialize_Strict()
+      : isolate()->builtins()->KeyedStoreIC_Initialize();
+  CallCode(ic, RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoStringAdd(LStringAdd* instr) {
+  __ push(ToRegister(instr->left()));
+  __ push(ToRegister(instr->right()));
+  StringAddStub stub(NO_STRING_CHECK_IN_STUB);
+  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+}
+
+
+void LCodeGen::DoStringCharCodeAt(LStringCharCodeAt* instr) {
+  class DeferredStringCharCodeAt: public LDeferredCode {
+   public:
+    DeferredStringCharCodeAt(LCodeGen* codegen, LStringCharCodeAt* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() { codegen()->DoDeferredStringCharCodeAt(instr_); }
+    virtual LInstruction* instr() { return instr_; }
+   private:
+    LStringCharCodeAt* instr_;
+  };
+
+  Register temp = scratch1();
+  Register string = ToRegister(instr->string());
+  Register index = ToRegister(instr->index());
+  Register result = ToRegister(instr->result());
+  DeferredStringCharCodeAt* deferred =
+      new DeferredStringCharCodeAt(this, instr);
+
+  // Fetch the instance type of the receiver into result register.
+  __ lw(result, FieldMemOperand(string, HeapObject::kMapOffset));
+  __ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset));
+
+  // We need special handling for indirect strings.
+  Label check_sequential;
+  __ And(temp, result, kIsIndirectStringMask);
+  __ Branch(&check_sequential, eq, temp, Operand(zero_reg));
+
+  // Dispatch on the indirect string shape: slice or cons.
+  Label cons_string;
+  __ And(temp, result, kSlicedNotConsMask);
+  __ Branch(&cons_string, eq, temp, Operand(zero_reg));
+
+  // Handle slices.
+  Label indirect_string_loaded;
+  __ lw(result, FieldMemOperand(string, SlicedString::kOffsetOffset));
+  __ sra(temp, result, kSmiTagSize);
+  __ addu(index, index, temp);
+  __ lw(string, FieldMemOperand(string, SlicedString::kParentOffset));
+  __ jmp(&indirect_string_loaded);
+
+  // Handle conses.
+  // Check whether the right hand side is the empty string (i.e. if
+  // this is really a flat string in a cons string). If that is not
+  // the case we would rather go to the runtime system now to flatten
+  // the string.
+  __ bind(&cons_string);
+  __ lw(result, FieldMemOperand(string, ConsString::kSecondOffset));
+  __ LoadRoot(temp, Heap::kEmptyStringRootIndex);
+  __ Branch(deferred->entry(), ne, result, Operand(temp));
+  // Get the first of the two strings and load its instance type.
+  __ lw(string, FieldMemOperand(string, ConsString::kFirstOffset));
+
+  __ bind(&indirect_string_loaded);
+  __ lw(result, FieldMemOperand(string, HeapObject::kMapOffset));
+  __ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset));
+
+  // Check whether the string is sequential. The only non-sequential
+  // shapes we support have just been unwrapped above.
+  __ bind(&check_sequential);
+  STATIC_ASSERT(kSeqStringTag == 0);
+  __ And(temp, result, Operand(kStringRepresentationMask));
+  __ Branch(deferred->entry(), ne, temp, Operand(zero_reg));
+
+  // Dispatch on the encoding: ASCII or two-byte.
+  Label ascii_string;
+  STATIC_ASSERT((kStringEncodingMask & kAsciiStringTag) != 0);
+  STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0);
+  __ And(temp, result, Operand(kStringEncodingMask));
+  __ Branch(&ascii_string, ne, temp, Operand(zero_reg));
+
+  // Two-byte string.
+  // Load the two-byte character code into the result register.
+  Label done;
+  __ Addu(result,
+          string,
+          Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
+  __ sll(temp, index, 1);
+  __ Addu(result, result, temp);
+  __ lhu(result, MemOperand(result, 0));
+  __ Branch(&done);
+
+  // ASCII string.
+  // Load the byte into the result register.
+  __ bind(&ascii_string);
+  __ Addu(result,
+          string,
+          Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
+  __ Addu(result, result, index);
+  __ lbu(result, MemOperand(result, 0));
+
+  __ bind(&done);
+  __ bind(deferred->exit());
+}
+
+
+void LCodeGen::DoDeferredStringCharCodeAt(LStringCharCodeAt* instr) {
+  Register string = ToRegister(instr->string());
+  Register result = ToRegister(instr->result());
+  Register scratch = scratch0();
+
+  // TODO(3095996): Get rid of this. For now, we need to make the
+  // result register contain a valid pointer because it is already
+  // contained in the register pointer map.
+  __ mov(result, zero_reg);
+
+  PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
+  __ push(string);
+  // Push the index as a smi. This is safe because of the checks in
+  // DoStringCharCodeAt above.
+  if (instr->index()->IsConstantOperand()) {
+    int const_index = ToInteger32(LConstantOperand::cast(instr->index()));
+    __ Addu(scratch, zero_reg, Operand(Smi::FromInt(const_index)));
+    __ push(scratch);
+  } else {
+    Register index = ToRegister(instr->index());
+    __ SmiTag(index);
+    __ push(index);
+  }
+  CallRuntimeFromDeferred(Runtime::kStringCharCodeAt, 2, instr);
+  if (FLAG_debug_code) {
+    __ AbortIfNotSmi(v0);
+  }
+  __ SmiUntag(v0);
+  __ StoreToSafepointRegisterSlot(v0, result);
+}
+
+
+void LCodeGen::DoStringCharFromCode(LStringCharFromCode* instr) {
+  class DeferredStringCharFromCode: public LDeferredCode {
+   public:
+    DeferredStringCharFromCode(LCodeGen* codegen, LStringCharFromCode* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() { codegen()->DoDeferredStringCharFromCode(instr_); }
+    virtual LInstruction* instr() { return instr_; }
+   private:
+    LStringCharFromCode* instr_;
+  };
+
+  DeferredStringCharFromCode* deferred =
+      new DeferredStringCharFromCode(this, instr);
+
+  ASSERT(instr->hydrogen()->value()->representation().IsInteger32());
+  Register char_code = ToRegister(instr->char_code());
+  Register result = ToRegister(instr->result());
+  Register scratch = scratch0();
+  ASSERT(!char_code.is(result));
+
+  __ Branch(deferred->entry(), hi,
+            char_code, Operand(String::kMaxAsciiCharCode));
+  __ LoadRoot(result, Heap::kSingleCharacterStringCacheRootIndex);
+  __ sll(scratch, char_code, kPointerSizeLog2);
+  __ Addu(result, result, scratch);
+  __ lw(result, FieldMemOperand(result, FixedArray::kHeaderSize));
+  __ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
+  __ Branch(deferred->entry(), eq, result, Operand(scratch));
+  __ bind(deferred->exit());
+}
+
+
+void LCodeGen::DoDeferredStringCharFromCode(LStringCharFromCode* instr) {
+  Register char_code = ToRegister(instr->char_code());
+  Register result = ToRegister(instr->result());
+
+  // TODO(3095996): Get rid of this. For now, we need to make the
+  // result register contain a valid pointer because it is already
+  // contained in the register pointer map.
+  __ mov(result, zero_reg);
+
+  PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
+  __ SmiTag(char_code);
+  __ push(char_code);
+  CallRuntimeFromDeferred(Runtime::kCharFromCode, 1, instr);
+  __ StoreToSafepointRegisterSlot(v0, result);
+}
+
+
+void LCodeGen::DoStringLength(LStringLength* instr) {
+  Register string = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  __ lw(result, FieldMemOperand(string, String::kLengthOffset));
+}
+
+
+void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsRegister() || input->IsStackSlot());
+  LOperand* output = instr->result();
+  ASSERT(output->IsDoubleRegister());
+  FPURegister single_scratch = double_scratch0().low();
+  if (input->IsStackSlot()) {
+    Register scratch = scratch0();
+    __ lw(scratch, ToMemOperand(input));
+    __ mtc1(scratch, single_scratch);
+  } else {
+    __ mtc1(ToRegister(input), single_scratch);
+  }
+  __ cvt_d_w(ToDoubleRegister(output), single_scratch);
+}
+
+
+void LCodeGen::DoNumberTagI(LNumberTagI* instr) {
+  class DeferredNumberTagI: public LDeferredCode {
+   public:
+    DeferredNumberTagI(LCodeGen* codegen, LNumberTagI* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() { codegen()->DoDeferredNumberTagI(instr_); }
+    virtual LInstruction* instr() { return instr_; }
+   private:
+    LNumberTagI* instr_;
+  };
+
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsRegister() && input->Equals(instr->result()));
+  Register reg = ToRegister(input);
+  Register overflow = scratch0();
+
+  DeferredNumberTagI* deferred = new DeferredNumberTagI(this, instr);
+  __ SmiTagCheckOverflow(reg, overflow);
+  __ BranchOnOverflow(deferred->entry(), overflow);
+  __ bind(deferred->exit());
+}
+
+
+void LCodeGen::DoDeferredNumberTagI(LNumberTagI* instr) {
+  Label slow;
+  Register reg = ToRegister(instr->InputAt(0));
+  FPURegister dbl_scratch = double_scratch0();
+
+  // Preserve the value of all registers.
+  PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
+
+  // There was overflow, so bits 30 and 31 of the original integer
+  // disagree. Try to allocate a heap number in new space and store
+  // the value in there. If that fails, call the runtime system.
+  Label done;
+  __ SmiUntag(reg);
+  __ Xor(reg, reg, Operand(0x80000000));
+  __ mtc1(reg, dbl_scratch);
+  __ cvt_d_w(dbl_scratch, dbl_scratch);
+  if (FLAG_inline_new) {
+    __ LoadRoot(t2, Heap::kHeapNumberMapRootIndex);
+    __ AllocateHeapNumber(t1, a3, t0, t2, &slow);
+    if (!reg.is(t1)) __ mov(reg, t1);
+    __ Branch(&done);
+  }
+
+  // Slow case: Call the runtime system to do the number allocation.
+  __ bind(&slow);
+
+  // TODO(3095996): Put a valid pointer value in the stack slot where the result
+  // register is stored, as this register is in the pointer map, but contains an
+  // integer value.
+  __ StoreToSafepointRegisterSlot(zero_reg, reg);
+  CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
+  if (!reg.is(v0)) __ mov(reg, v0);
+
+  // Done. Put the value in dbl_scratch into the value of the allocated heap
+  // number.
+  __ bind(&done);
+  __ sdc1(dbl_scratch, FieldMemOperand(reg, HeapNumber::kValueOffset));
+  __ StoreToSafepointRegisterSlot(reg, reg);
+}
+
+
+void LCodeGen::DoNumberTagD(LNumberTagD* instr) {
+  class DeferredNumberTagD: public LDeferredCode {
+   public:
+    DeferredNumberTagD(LCodeGen* codegen, LNumberTagD* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() { codegen()->DoDeferredNumberTagD(instr_); }
+    virtual LInstruction* instr() { return instr_; }
+   private:
+    LNumberTagD* instr_;
+  };
+
+  DoubleRegister input_reg = ToDoubleRegister(instr->InputAt(0));
+  Register scratch = scratch0();
+  Register reg = ToRegister(instr->result());
+  Register temp1 = ToRegister(instr->TempAt(0));
+  Register temp2 = ToRegister(instr->TempAt(1));
+
+  DeferredNumberTagD* deferred = new DeferredNumberTagD(this, instr);
+  if (FLAG_inline_new) {
+    __ LoadRoot(scratch, Heap::kHeapNumberMapRootIndex);
+    __ AllocateHeapNumber(reg, temp1, temp2, scratch, deferred->entry());
+  } else {
+    __ Branch(deferred->entry());
+  }
+  __ bind(deferred->exit());
+  __ sdc1(input_reg, FieldMemOperand(reg, HeapNumber::kValueOffset));
+}
+
+
+void LCodeGen::DoDeferredNumberTagD(LNumberTagD* instr) {
+  // TODO(3095996): Get rid of this. For now, we need to make the
+  // result register contain a valid pointer because it is already
+  // contained in the register pointer map.
+  Register reg = ToRegister(instr->result());
+  __ mov(reg, zero_reg);
+
+  PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
+  CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
+  __ StoreToSafepointRegisterSlot(v0, reg);
+}
+
+
+void LCodeGen::DoSmiTag(LSmiTag* instr) {
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsRegister() && input->Equals(instr->result()));
+  ASSERT(!instr->hydrogen_value()->CheckFlag(HValue::kCanOverflow));
+  __ SmiTag(ToRegister(input));
+}
+
+
+void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
+  Register scratch = scratch0();
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsRegister() && input->Equals(instr->result()));
+  if (instr->needs_check()) {
+    STATIC_ASSERT(kHeapObjectTag == 1);
+    // If the input is a HeapObject, value of scratch won't be zero.
+    __ And(scratch, ToRegister(input), Operand(kHeapObjectTag));
+    __ SmiUntag(ToRegister(input));
+    DeoptimizeIf(ne, instr->environment(), scratch, Operand(zero_reg));
+  } else {
+    __ SmiUntag(ToRegister(input));
+  }
+}
+
+
+void LCodeGen::EmitNumberUntagD(Register input_reg,
+                                DoubleRegister result_reg,
+                                bool deoptimize_on_undefined,
+                                LEnvironment* env) {
+  Register scratch = scratch0();
+
+  Label load_smi, heap_number, done;
+
+  // Smi check.
+  __ JumpIfSmi(input_reg, &load_smi);
+
+  // Heap number map check.
+  __ lw(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
+  __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+  if (deoptimize_on_undefined) {
+    DeoptimizeIf(ne, env, scratch, Operand(at));
+  } else {
+    Label heap_number;
+    __ Branch(&heap_number, eq, scratch, Operand(at));
+
+    __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+    DeoptimizeIf(ne, env, input_reg, Operand(at));
+
+    // Convert undefined to NaN.
+    __ LoadRoot(at, Heap::kNanValueRootIndex);
+    __ ldc1(result_reg, FieldMemOperand(at, HeapNumber::kValueOffset));
+    __ Branch(&done);
+
+    __ bind(&heap_number);
+  }
+  // Heap number to double register conversion.
+  __ ldc1(result_reg, FieldMemOperand(input_reg, HeapNumber::kValueOffset));
+  __ Branch(&done);
+
+  // Smi to double register conversion
+  __ bind(&load_smi);
+  __ SmiUntag(input_reg);  // Untag smi before converting to float.
+  __ mtc1(input_reg, result_reg);
+  __ cvt_d_w(result_reg, result_reg);
+  __ SmiTag(input_reg);  // Retag smi.
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoDeferredTaggedToI(LTaggedToI* instr) {
+  Register input_reg = ToRegister(instr->InputAt(0));
+  Register scratch1 = scratch0();
+  Register scratch2 = ToRegister(instr->TempAt(0));
+  DoubleRegister double_scratch = double_scratch0();
+  FPURegister single_scratch = double_scratch.low();
+
+  ASSERT(!scratch1.is(input_reg) && !scratch1.is(scratch2));
+  ASSERT(!scratch2.is(input_reg) && !scratch2.is(scratch1));
+
+  Label done;
+
+  // The input is a tagged HeapObject.
+  // Heap number map check.
+  __ lw(scratch1, FieldMemOperand(input_reg, HeapObject::kMapOffset));
+  __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+  // This 'at' value and scratch1 map value are used for tests in both clauses
+  // of the if.
+
+  if (instr->truncating()) {
+    Register scratch3 = ToRegister(instr->TempAt(1));
+    DoubleRegister double_scratch2 = ToDoubleRegister(instr->TempAt(2));
+    ASSERT(!scratch3.is(input_reg) &&
+           !scratch3.is(scratch1) &&
+           !scratch3.is(scratch2));
+    // Performs a truncating conversion of a floating point number as used by
+    // the JS bitwise operations.
+    Label heap_number;
+    __ Branch(&heap_number, eq, scratch1, Operand(at));  // HeapNumber map?
+    // Check for undefined. Undefined is converted to zero for truncating
+    // conversions.
+    __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+    DeoptimizeIf(ne, instr->environment(), input_reg, Operand(at));
+    ASSERT(ToRegister(instr->result()).is(input_reg));
+    __ mov(input_reg, zero_reg);
+    __ Branch(&done);
+
+    __ bind(&heap_number);
+    __ ldc1(double_scratch2,
+            FieldMemOperand(input_reg, HeapNumber::kValueOffset));
+    __ EmitECMATruncate(input_reg,
+                        double_scratch2,
+                        single_scratch,
+                        scratch1,
+                        scratch2,
+                        scratch3);
+  } else {
+    // Deoptimize if we don't have a heap number.
+    DeoptimizeIf(ne, instr->environment(), scratch1, Operand(at));
+
+    // Load the double value.
+    __ ldc1(double_scratch,
+            FieldMemOperand(input_reg, HeapNumber::kValueOffset));
+
+    Register except_flag = scratch2;
+    __ EmitFPUTruncate(kRoundToZero,
+                       single_scratch,
+                       double_scratch,
+                       scratch1,
+                       except_flag,
+                       kCheckForInexactConversion);
+
+    // Deopt if the operation did not succeed.
+    DeoptimizeIf(ne, instr->environment(), except_flag, Operand(zero_reg));
+
+    // Load the result.
+    __ mfc1(input_reg, single_scratch);
+
+    if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      __ Branch(&done, ne, input_reg, Operand(zero_reg));
+
+      __ mfc1(scratch1, double_scratch.high());
+      __ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
+      DeoptimizeIf(ne, instr->environment(), scratch1, Operand(zero_reg));
+    }
+  }
+  __ bind(&done);
+}
+
+
+void LCodeGen::DoTaggedToI(LTaggedToI* instr) {
+  class DeferredTaggedToI: public LDeferredCode {
+   public:
+    DeferredTaggedToI(LCodeGen* codegen, LTaggedToI* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() { codegen()->DoDeferredTaggedToI(instr_); }
+    virtual LInstruction* instr() { return instr_; }
+   private:
+    LTaggedToI* instr_;
+  };
+
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsRegister());
+  ASSERT(input->Equals(instr->result()));
+
+  Register input_reg = ToRegister(input);
+
+  DeferredTaggedToI* deferred = new DeferredTaggedToI(this, instr);
+
+  // Let the deferred code handle the HeapObject case.
+  __ JumpIfNotSmi(input_reg, deferred->entry());
+
+  // Smi to int32 conversion.
+  __ SmiUntag(input_reg);
+  __ bind(deferred->exit());
+}
+
+
+void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsRegister());
+  LOperand* result = instr->result();
+  ASSERT(result->IsDoubleRegister());
+
+  Register input_reg = ToRegister(input);
+  DoubleRegister result_reg = ToDoubleRegister(result);
+
+  EmitNumberUntagD(input_reg, result_reg,
+                   instr->hydrogen()->deoptimize_on_undefined(),
+                   instr->environment());
+}
+
+
+void LCodeGen::DoDoubleToI(LDoubleToI* instr) {
+  Register result_reg = ToRegister(instr->result());
+  Register scratch1 = scratch0();
+  Register scratch2 = ToRegister(instr->TempAt(0));
+  DoubleRegister double_input = ToDoubleRegister(instr->InputAt(0));
+  DoubleRegister double_scratch = double_scratch0();
+  FPURegister single_scratch = double_scratch0().low();
+
+  if (instr->truncating()) {
+    Register scratch3 = ToRegister(instr->TempAt(1));
+    __ EmitECMATruncate(result_reg,
+                        double_input,
+                        single_scratch,
+                        scratch1,
+                        scratch2,
+                        scratch3);
+  } else {
+    Register except_flag = scratch2;
+
+    __ EmitFPUTruncate(kRoundToMinusInf,
+                       single_scratch,
+                       double_input,
+                       scratch1,
+                       except_flag,
+                       kCheckForInexactConversion);
+
+    // Deopt if the operation did not succeed (except_flag != 0).
+    DeoptimizeIf(ne, instr->environment(), except_flag, Operand(zero_reg));
+
+    // Load the result.
+    __ mfc1(result_reg, single_scratch);
+  }
+}
+
+
+void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
+  LOperand* input = instr->InputAt(0);
+  __ And(at, ToRegister(input), Operand(kSmiTagMask));
+  DeoptimizeIf(ne, instr->environment(), at, Operand(zero_reg));
+}
+
+
+void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
+  LOperand* input = instr->InputAt(0);
+  __ And(at, ToRegister(input), Operand(kSmiTagMask));
+  DeoptimizeIf(eq, instr->environment(), at, Operand(zero_reg));
+}
+
+
+void LCodeGen::DoCheckInstanceType(LCheckInstanceType* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register scratch = scratch0();
+
+  __ GetObjectType(input, scratch, scratch);
+
+  if (instr->hydrogen()->is_interval_check()) {
+    InstanceType first;
+    InstanceType last;
+    instr->hydrogen()->GetCheckInterval(&first, &last);
+
+    // If there is only one type in the interval check for equality.
+    if (first == last) {
+      DeoptimizeIf(ne, instr->environment(), scratch, Operand(first));
+    } else {
+      DeoptimizeIf(lo, instr->environment(), scratch, Operand(first));
+      // Omit check for the last type.
+      if (last != LAST_TYPE) {
+        DeoptimizeIf(hi, instr->environment(), scratch, Operand(last));
+      }
+    }
+  } else {
+    uint8_t mask;
+    uint8_t tag;
+    instr->hydrogen()->GetCheckMaskAndTag(&mask, &tag);
+
+    if (IsPowerOf2(mask)) {
+      ASSERT(tag == 0 || IsPowerOf2(tag));
+      __ And(at, scratch, mask);
+      DeoptimizeIf(tag == 0 ? ne : eq, instr->environment(),
+          at, Operand(zero_reg));
+    } else {
+      __ And(scratch, scratch, Operand(mask));
+      DeoptimizeIf(ne, instr->environment(), scratch, Operand(tag));
+    }
+  }
+}
+
+
+void LCodeGen::DoCheckFunction(LCheckFunction* instr) {
+  ASSERT(instr->InputAt(0)->IsRegister());
+  Register reg = ToRegister(instr->InputAt(0));
+  DeoptimizeIf(ne, instr->environment(), reg,
+               Operand(instr->hydrogen()->target()));
+}
+
+
+void LCodeGen::DoCheckMap(LCheckMap* instr) {
+  Register scratch = scratch0();
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsRegister());
+  Register reg = ToRegister(input);
+  __ lw(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+  DeoptimizeIf(ne,
+               instr->environment(),
+               scratch,
+               Operand(instr->hydrogen()->map()));
+}
+
+
+void LCodeGen::DoClampDToUint8(LClampDToUint8* instr) {
+  DoubleRegister value_reg = ToDoubleRegister(instr->unclamped());
+  Register result_reg = ToRegister(instr->result());
+  DoubleRegister temp_reg = ToDoubleRegister(instr->TempAt(0));
+  __ ClampDoubleToUint8(result_reg, value_reg, temp_reg);
+}
+
+
+void LCodeGen::DoClampIToUint8(LClampIToUint8* instr) {
+  Register unclamped_reg = ToRegister(instr->unclamped());
+  Register result_reg = ToRegister(instr->result());
+  __ ClampUint8(result_reg, unclamped_reg);
+}
+
+
+void LCodeGen::DoClampTToUint8(LClampTToUint8* instr) {
+  Register scratch = scratch0();
+  Register input_reg = ToRegister(instr->unclamped());
+  Register result_reg = ToRegister(instr->result());
+  DoubleRegister temp_reg = ToDoubleRegister(instr->TempAt(0));
+  Label is_smi, done, heap_number;
+
+  // Both smi and heap number cases are handled.
+  __ JumpIfSmi(input_reg, &is_smi);
+
+  // Check for heap number
+  __ lw(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
+  __ Branch(&heap_number, eq, scratch, Operand(factory()->heap_number_map()));
+
+  // Check for undefined. Undefined is converted to zero for clamping
+  // conversions.
+  DeoptimizeIf(ne, instr->environment(), input_reg,
+               Operand(factory()->undefined_value()));
+  __ mov(result_reg, zero_reg);
+  __ jmp(&done);
+
+  // Heap number
+  __ bind(&heap_number);
+  __ ldc1(double_scratch0(), FieldMemOperand(input_reg,
+                                             HeapNumber::kValueOffset));
+  __ ClampDoubleToUint8(result_reg, double_scratch0(), temp_reg);
+  __ jmp(&done);
+
+  // smi
+  __ bind(&is_smi);
+  __ SmiUntag(scratch, input_reg);
+  __ ClampUint8(result_reg, scratch);
+
+  __ bind(&done);
+}
+
+
+void LCodeGen::LoadHeapObject(Register result,
+                              Handle<HeapObject> object) {
+  if (heap()->InNewSpace(*object)) {
+    Handle<JSGlobalPropertyCell> cell =
+        factory()->NewJSGlobalPropertyCell(object);
+    __ li(result, Operand(cell));
+    __ lw(result, FieldMemOperand(result, JSGlobalPropertyCell::kValueOffset));
+  } else {
+    __ li(result, Operand(object));
+  }
+}
+
+
+void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
+  Register temp1 = ToRegister(instr->TempAt(0));
+  Register temp2 = ToRegister(instr->TempAt(1));
+
+  Handle<JSObject> holder = instr->holder();
+  Handle<JSObject> current_prototype = instr->prototype();
+
+  // Load prototype object.
+  LoadHeapObject(temp1, current_prototype);
+
+  // Check prototype maps up to the holder.
+  while (!current_prototype.is_identical_to(holder)) {
+    __ lw(temp2, FieldMemOperand(temp1, HeapObject::kMapOffset));
+    DeoptimizeIf(ne,
+                 instr->environment(),
+                 temp2,
+                 Operand(Handle<Map>(current_prototype->map())));
+    current_prototype =
+        Handle<JSObject>(JSObject::cast(current_prototype->GetPrototype()));
+    // Load next prototype object.
+    LoadHeapObject(temp1, current_prototype);
+  }
+
+  // Check the holder map.
+  __ lw(temp2, FieldMemOperand(temp1, HeapObject::kMapOffset));
+  DeoptimizeIf(ne,
+               instr->environment(),
+               temp2,
+               Operand(Handle<Map>(current_prototype->map())));
+}
+
+
+void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
+  __ lw(a3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ lw(a3, FieldMemOperand(a3, JSFunction::kLiteralsOffset));
+  __ li(a2, Operand(Smi::FromInt(instr->hydrogen()->literal_index())));
+  __ li(a1, Operand(instr->hydrogen()->constant_elements()));
+  __ Push(a3, a2, a1);
+
+  // Pick the right runtime function or stub to call.
+  int length = instr->hydrogen()->length();
+  if (instr->hydrogen()->IsCopyOnWrite()) {
+    ASSERT(instr->hydrogen()->depth() == 1);
+    FastCloneShallowArrayStub::Mode mode =
+        FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS;
+    FastCloneShallowArrayStub stub(mode, length);
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  } else if (instr->hydrogen()->depth() > 1) {
+    CallRuntime(Runtime::kCreateArrayLiteral, 3, instr);
+  } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
+    CallRuntime(Runtime::kCreateArrayLiteralShallow, 3, instr);
+  } else {
+    FastCloneShallowArrayStub::Mode mode =
+        FastCloneShallowArrayStub::CLONE_ELEMENTS;
+    FastCloneShallowArrayStub stub(mode, length);
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  }
+}
+
+
+void LCodeGen::DoObjectLiteral(LObjectLiteral* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+  __ lw(t0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ lw(t0, FieldMemOperand(t0, JSFunction::kLiteralsOffset));
+  __ li(a3, Operand(Smi::FromInt(instr->hydrogen()->literal_index())));
+  __ li(a2, Operand(instr->hydrogen()->constant_properties()));
+  __ li(a1, Operand(Smi::FromInt(instr->hydrogen()->fast_elements() ? 1 : 0)));
+  __ Push(t0, a3, a2, a1);
+
+  // Pick the right runtime function to call.
+  if (instr->hydrogen()->depth() > 1) {
+    CallRuntime(Runtime::kCreateObjectLiteral, 4, instr);
+  } else {
+    CallRuntime(Runtime::kCreateObjectLiteralShallow, 4, instr);
+  }
+}
+
+
+void LCodeGen::DoToFastProperties(LToFastProperties* instr) {
+  ASSERT(ToRegister(instr->InputAt(0)).is(a0));
+  ASSERT(ToRegister(instr->result()).is(v0));
+  __ push(a0);
+  CallRuntime(Runtime::kToFastProperties, 1, instr);
+}
+
+
+void LCodeGen::DoRegExpLiteral(LRegExpLiteral* instr) {
+  Label materialized;
+  // Registers will be used as follows:
+  // a3 = JS function.
+  // t3 = literals array.
+  // a1 = regexp literal.
+  // a0 = regexp literal clone.
+  // a2 and t0-t2 are used as temporaries.
+  __ lw(a3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ lw(t3, FieldMemOperand(a3, JSFunction::kLiteralsOffset));
+  int literal_offset = FixedArray::kHeaderSize +
+      instr->hydrogen()->literal_index() * kPointerSize;
+  __ lw(a1, FieldMemOperand(t3, literal_offset));
+  __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+  __ Branch(&materialized, ne, a1, Operand(at));
+
+  // Create regexp literal using runtime function
+  // Result will be in v0.
+  __ li(t2, Operand(Smi::FromInt(instr->hydrogen()->literal_index())));
+  __ li(t1, Operand(instr->hydrogen()->pattern()));
+  __ li(t0, Operand(instr->hydrogen()->flags()));
+  __ Push(t3, t2, t1, t0);
+  CallRuntime(Runtime::kMaterializeRegExpLiteral, 4, instr);
+  __ mov(a1, v0);
+
+  __ bind(&materialized);
+  int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
+  Label allocated, runtime_allocate;
+
+  __ AllocateInNewSpace(size, v0, a2, a3, &runtime_allocate, TAG_OBJECT);
+  __ jmp(&allocated);
+
+  __ bind(&runtime_allocate);
+  __ li(a0, Operand(Smi::FromInt(size)));
+  __ Push(a1, a0);
+  CallRuntime(Runtime::kAllocateInNewSpace, 1, instr);
+  __ pop(a1);
+
+  __ bind(&allocated);
+  // Copy the content into the newly allocated memory.
+  // (Unroll copy loop once for better throughput).
+  for (int i = 0; i < size - kPointerSize; i += 2 * kPointerSize) {
+    __ lw(a3, FieldMemOperand(a1, i));
+    __ lw(a2, FieldMemOperand(a1, i + kPointerSize));
+    __ sw(a3, FieldMemOperand(v0, i));
+    __ sw(a2, FieldMemOperand(v0, i + kPointerSize));
+  }
+  if ((size % (2 * kPointerSize)) != 0) {
+    __ lw(a3, FieldMemOperand(a1, size - kPointerSize));
+    __ sw(a3, FieldMemOperand(v0, size - kPointerSize));
+  }
+}
+
+
+void LCodeGen::DoFunctionLiteral(LFunctionLiteral* instr) {
+  // Use the fast case closure allocation code that allocates in new
+  // space for nested functions that don't need literals cloning.
+  Handle<SharedFunctionInfo> shared_info = instr->shared_info();
+  bool pretenure = instr->hydrogen()->pretenure();
+  if (!pretenure && shared_info->num_literals() == 0) {
+    FastNewClosureStub stub(
+        shared_info->strict_mode() ? kStrictMode : kNonStrictMode);
+    __ li(a1, Operand(shared_info));
+    __ push(a1);
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  } else {
+    __ li(a2, Operand(shared_info));
+    __ li(a1, Operand(pretenure
+                       ? factory()->true_value()
+                       : factory()->false_value()));
+    __ Push(cp, a2, a1);
+    CallRuntime(Runtime::kNewClosure, 3, instr);
+  }
+}
+
+
+void LCodeGen::DoTypeof(LTypeof* instr) {
+  ASSERT(ToRegister(instr->result()).is(v0));
+  Register input = ToRegister(instr->InputAt(0));
+  __ push(input);
+  CallRuntime(Runtime::kTypeof, 1, instr);
+}
+
+
+void LCodeGen::DoTypeofIsAndBranch(LTypeofIsAndBranch* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+  Label* true_label = chunk_->GetAssemblyLabel(true_block);
+  Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+  Register cmp1 = no_reg;
+  Operand cmp2 = Operand(no_reg);
+
+  Condition final_branch_condition = EmitTypeofIs(true_label,
+                                                  false_label,
+                                                  input,
+                                                  instr->type_literal(),
+                                                  cmp1,
+                                                  cmp2);
+
+  ASSERT(cmp1.is_valid());
+  ASSERT(!cmp2.is_reg() || cmp2.rm().is_valid());
+
+  if (final_branch_condition != kNoCondition) {
+    EmitBranch(true_block, false_block, final_branch_condition, cmp1, cmp2);
+  }
+}
+
+
+Condition LCodeGen::EmitTypeofIs(Label* true_label,
+                                 Label* false_label,
+                                 Register input,
+                                 Handle<String> type_name,
+                                 Register& cmp1,
+                                 Operand& cmp2) {
+  // This function utilizes the delay slot heavily. This is used to load
+  // values that are always usable without depending on the type of the input
+  // register.
+  Condition final_branch_condition = kNoCondition;
+  Register scratch = scratch0();
+  if (type_name->Equals(heap()->number_symbol())) {
+    __ JumpIfSmi(input, true_label);
+    __ lw(input, FieldMemOperand(input, HeapObject::kMapOffset));
+    __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+    cmp1 = input;
+    cmp2 = Operand(at);
+    final_branch_condition = eq;
+
+  } else if (type_name->Equals(heap()->string_symbol())) {
+    __ JumpIfSmi(input, false_label);
+    __ GetObjectType(input, input, scratch);
+    __ Branch(USE_DELAY_SLOT, false_label,
+              ge, scratch, Operand(FIRST_NONSTRING_TYPE));
+    // input is an object so we can load the BitFieldOffset even if we take the
+    // other branch.
+    __ lbu(at, FieldMemOperand(input, Map::kBitFieldOffset));
+    __ And(at, at, 1 << Map::kIsUndetectable);
+    cmp1 = at;
+    cmp2 = Operand(zero_reg);
+    final_branch_condition = eq;
+
+  } else if (type_name->Equals(heap()->boolean_symbol())) {
+    __ LoadRoot(at, Heap::kTrueValueRootIndex);
+    __ Branch(USE_DELAY_SLOT, true_label, eq, at, Operand(input));
+    __ LoadRoot(at, Heap::kFalseValueRootIndex);
+    cmp1 = at;
+    cmp2 = Operand(input);
+    final_branch_condition = eq;
+
+  } else if (FLAG_harmony_typeof && type_name->Equals(heap()->null_symbol())) {
+    __ LoadRoot(at, Heap::kNullValueRootIndex);
+    cmp1 = at;
+    cmp2 = Operand(input);
+    final_branch_condition = eq;
+
+  } else if (type_name->Equals(heap()->undefined_symbol())) {
+    __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+    __ Branch(USE_DELAY_SLOT, true_label, eq, at, Operand(input));
+    // The first instruction of JumpIfSmi is an And - it is safe in the delay
+    // slot.
+    __ JumpIfSmi(input, false_label);
+    // Check for undetectable objects => true.
+    __ lw(input, FieldMemOperand(input, HeapObject::kMapOffset));
+    __ lbu(at, FieldMemOperand(input, Map::kBitFieldOffset));
+    __ And(at, at, 1 << Map::kIsUndetectable);
+    cmp1 = at;
+    cmp2 = Operand(zero_reg);
+    final_branch_condition = ne;
+
+  } else if (type_name->Equals(heap()->function_symbol())) {
+    STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
+    __ JumpIfSmi(input, false_label);
+    __ GetObjectType(input, scratch, input);
+    __ Branch(true_label, eq, input, Operand(JS_FUNCTION_TYPE));
+    cmp1 = input;
+    cmp2 = Operand(JS_FUNCTION_PROXY_TYPE);
+    final_branch_condition = eq;
+
+  } else if (type_name->Equals(heap()->object_symbol())) {
+    __ JumpIfSmi(input, false_label);
+    if (!FLAG_harmony_typeof) {
+      __ LoadRoot(at, Heap::kNullValueRootIndex);
+      __ Branch(USE_DELAY_SLOT, true_label, eq, at, Operand(input));
+    }
+    // input is an object, it is safe to use GetObjectType in the delay slot.
+    __ GetObjectType(input, input, scratch);
+    __ Branch(USE_DELAY_SLOT, false_label,
+              lt, scratch, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
+    // Still an object, so the InstanceType can be loaded.
+    __ lbu(scratch, FieldMemOperand(input, Map::kInstanceTypeOffset));
+    __ Branch(USE_DELAY_SLOT, false_label,
+              gt, scratch, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE));
+    // Still an object, so the BitField can be loaded.
+    // Check for undetectable objects => false.
+    __ lbu(at, FieldMemOperand(input, Map::kBitFieldOffset));
+    __ And(at, at, 1 << Map::kIsUndetectable);
+    cmp1 = at;
+    cmp2 = Operand(zero_reg);
+    final_branch_condition = eq;
+
+  } else {
+    cmp1 = at;
+    cmp2 = Operand(zero_reg);  // Set to valid regs, to avoid caller assertion.
+    __ Branch(false_label);
+  }
+
+  return final_branch_condition;
+}
+
+
+void LCodeGen::DoIsConstructCallAndBranch(LIsConstructCallAndBranch* instr) {
+  Register temp1 = ToRegister(instr->TempAt(0));
+  int true_block = chunk_->LookupDestination(instr->true_block_id());
+  int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+  EmitIsConstructCall(temp1, scratch0());
+
+  EmitBranch(true_block, false_block, eq, temp1,
+             Operand(Smi::FromInt(StackFrame::CONSTRUCT)));
+}
+
+
+void LCodeGen::EmitIsConstructCall(Register temp1, Register temp2) {
+  ASSERT(!temp1.is(temp2));
+  // Get the frame pointer for the calling frame.
+  __ lw(temp1, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+
+  // Skip the arguments adaptor frame if it exists.
+  Label check_frame_marker;
+  __ lw(temp2, MemOperand(temp1, StandardFrameConstants::kContextOffset));
+  __ Branch(&check_frame_marker, ne, temp2,
+            Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
+  __ lw(temp1, MemOperand(temp1, StandardFrameConstants::kCallerFPOffset));
+
+  // Check the marker in the calling frame.
+  __ bind(&check_frame_marker);
+  __ lw(temp1, MemOperand(temp1, StandardFrameConstants::kMarkerOffset));
+}
+
+
+void LCodeGen::DoLazyBailout(LLazyBailout* instr) {
+  // No code for lazy bailout instruction. Used to capture environment after a
+  // call for populating the safepoint data with deoptimization data.
+}
+
+
+void LCodeGen::DoDeoptimize(LDeoptimize* instr) {
+  DeoptimizeIf(al, instr->environment(), zero_reg, Operand(zero_reg));
+}
+
+
+void LCodeGen::DoDeleteProperty(LDeleteProperty* instr) {
+  Register object = ToRegister(instr->object());
+  Register key = ToRegister(instr->key());
+  Register strict = scratch0();
+  __ li(strict, Operand(Smi::FromInt(strict_mode_flag())));
+  __ Push(object, key, strict);
+  ASSERT(instr->HasPointerMap() && instr->HasDeoptimizationEnvironment());
+  LPointerMap* pointers = instr->pointer_map();
+  LEnvironment* env = instr->deoptimization_environment();
+  RecordPosition(pointers->position());
+  RegisterEnvironmentForDeoptimization(env);
+  SafepointGenerator safepoint_generator(this,
+                                         pointers,
+                                         env->deoptimization_index());
+  __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION, safepoint_generator);
+}
+
+
+void LCodeGen::DoIn(LIn* instr) {
+  Register obj = ToRegister(instr->object());
+  Register key = ToRegister(instr->key());
+  __ Push(key, obj);
+  ASSERT(instr->HasPointerMap() && instr->HasDeoptimizationEnvironment());
+  LPointerMap* pointers = instr->pointer_map();
+  LEnvironment* env = instr->deoptimization_environment();
+  RecordPosition(pointers->position());
+  RegisterEnvironmentForDeoptimization(env);
+  SafepointGenerator safepoint_generator(this,
+                                         pointers,
+                                         env->deoptimization_index());
+  __ InvokeBuiltin(Builtins::IN, CALL_FUNCTION, safepoint_generator);
+}
+
+
+void LCodeGen::DoDeferredStackCheck(LStackCheck* instr) {
+  {
+    PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
+    __ CallRuntimeSaveDoubles(Runtime::kStackGuard);
+    RegisterLazyDeoptimization(
+        instr, RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
+  }
+
+  // The gap code includes the restoring of the safepoint registers.
+  int pc = masm()->pc_offset();
+  safepoints_.SetPcAfterGap(pc);
+}
+
+
+void LCodeGen::DoStackCheck(LStackCheck* instr) {
+  class DeferredStackCheck: public LDeferredCode {
+   public:
+    DeferredStackCheck(LCodeGen* codegen, LStackCheck* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() { codegen()->DoDeferredStackCheck(instr_); }
+    virtual LInstruction* instr() { return instr_; }
+   private:
+    LStackCheck* instr_;
+  };
+
+  if (instr->hydrogen()->is_function_entry()) {
+    // Perform stack overflow check.
+    Label done;
+    __ LoadRoot(at, Heap::kStackLimitRootIndex);
+    __ Branch(&done, hs, sp, Operand(at));
+    StackCheckStub stub;
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+    __ bind(&done);
+  } else {
+    ASSERT(instr->hydrogen()->is_backwards_branch());
+    // Perform stack overflow check if this goto needs it before jumping.
+    DeferredStackCheck* deferred_stack_check =
+        new DeferredStackCheck(this, instr);
+    __ LoadRoot(at, Heap::kStackLimitRootIndex);
+    __ Branch(deferred_stack_check->entry(), lo, sp, Operand(at));
+    __ bind(instr->done_label());
+    deferred_stack_check->SetExit(instr->done_label());
+  }
+}
+
+
+void LCodeGen::DoOsrEntry(LOsrEntry* instr) {
+  // This is a pseudo-instruction that ensures that the environment here is
+  // properly registered for deoptimization and records the assembler's PC
+  // offset.
+  LEnvironment* environment = instr->environment();
+  environment->SetSpilledRegisters(instr->SpilledRegisterArray(),
+                                   instr->SpilledDoubleRegisterArray());
+
+  // If the environment were already registered, we would have no way of
+  // backpatching it with the spill slot operands.
+  ASSERT(!environment->HasBeenRegistered());
+  RegisterEnvironmentForDeoptimization(environment);
+  ASSERT(osr_pc_offset_ == -1);
+  osr_pc_offset_ = masm()->pc_offset();
+}
+
+
+#undef __
+
+} }  // namespace v8::internal