[interpreter] Introduce fused bytecodes for common sequences.

src/interpreter/interpreter.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/interpreter.h"
 
 #include <fstream>
 
 #include "src/ast/prettyprinter.h"
 #include "src/code-factory.h"
@@ skipping 268 matching lines @@
 // LdaSmi <imm>
 //
 // Load an integer literal into the accumulator as a Smi.
 void Interpreter::DoLdaSmi(InterpreterAssembler* assembler) {
   Node* raw_int = __ BytecodeOperandImm(0);
   Node* smi_int = __ SmiTag(raw_int);
   __ SetAccumulator(smi_int);
   __ Dispatch();
 }
 
-void Interpreter::DoLoadConstant(InterpreterAssembler* assembler) {
+// LdaConstant <idx>
+//
+// Load constant literal at |idx| in the constant pool into the accumulator.
+void Interpreter::DoLdaConstant(InterpreterAssembler* assembler) {
   Node* index = __ BytecodeOperandIdx(0);
   Node* constant = __ LoadConstantPoolEntry(index);
   __ SetAccumulator(constant);
   __ Dispatch();
 }
 
-
-// LdaConstant <idx>
-//
-// Load constant literal at |idx| in the constant pool into the accumulator.
-void Interpreter::DoLdaConstant(InterpreterAssembler* assembler) {
-  DoLoadConstant(assembler);
+Node* Interpreter::BuildLoadUndefined(InterpreterAssembler* assembler) {
+  return __ HeapConstant(isolate_->factory()->undefined_value());
 }
 
 // LdaUndefined
 //
 // Load Undefined into the accumulator.
 void Interpreter::DoLdaUndefined(InterpreterAssembler* assembler) {
-  Node* undefined_value =
-      __ HeapConstant(isolate_->factory()->undefined_value());
-  __ SetAccumulator(undefined_value);
+  Node* result = BuildLoadUndefined(assembler);
+  __ SetAccumulator(result);
   __ Dispatch();
 }
 
-
 // LdaNull
 //
 // Load Null into the accumulator.
 void Interpreter::DoLdaNull(InterpreterAssembler* assembler) {
   Node* null_value = __ HeapConstant(isolate_->factory()->null_value());
   __ SetAccumulator(null_value);
   __ Dispatch();
 }
 
 
@@ skipping 53 matching lines @@
 //
 // Stores the value of register <src> to register <dst>.
 void Interpreter::DoMov(InterpreterAssembler* assembler) {
   Node* src_index = __ BytecodeOperandReg(0);
   Node* src_value = __ LoadRegister(src_index);
   Node* dst_index = __ BytecodeOperandReg(1);
   __ StoreRegister(src_value, dst_index);
   __ Dispatch();
 }
 
-
-void Interpreter::DoLoadGlobal(Callable ic, InterpreterAssembler* assembler) {
+Node* Interpreter::BuildLoadGlobal(Callable ic,
+                                   InterpreterAssembler* assembler) {
   // Get the global object.
   Node* context = __ GetContext();
   Node* native_context =
       __ LoadContextSlot(context, Context::NATIVE_CONTEXT_INDEX);
   Node* global = __ LoadContextSlot(native_context, Context::EXTENSION_INDEX);
 
   // Load the global via the LoadIC.
   Node* code_target = __ HeapConstant(ic.code());
   Node* constant_index = __ BytecodeOperandIdx(0);
   Node* name = __ LoadConstantPoolEntry(constant_index);
   Node* raw_slot = __ BytecodeOperandIdx(1);
   Node* smi_slot = __ SmiTag(raw_slot);
   Node* type_feedback_vector = __ LoadTypeFeedbackVector();
-  Node* result = __ CallStub(ic.descriptor(), code_target, context, global,
-                             name, smi_slot, type_feedback_vector);
+  return __ CallStub(ic.descriptor(), code_target, context, global, name,
+                     smi_slot, type_feedback_vector);
+}
+
+void Interpreter::DoLdaGlobal(Callable ic, InterpreterAssembler* assembler) {

[rmcilroy, 2016/05/17 15:49:33]

I'd just remove these existing helpers - it's not worth it, we should just use
the new ones you are adding and do the SetAccumulator / Register and Dispatch in
the DoXXX functions.

[oth, 2016/05/18 20:22:25]

Done.

+  Node* result = BuildLoadGlobal(ic, assembler);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 // LdaGlobal <name_index> <slot>
 //
 // Load the global with name in constant pool entry <name_index> into the
 // accumulator using FeedBackVector slot <slot> outside of a typeof.
 void Interpreter::DoLdaGlobal(InterpreterAssembler* assembler) {
   Callable ic = CodeFactory::LoadICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF,
                                                    UNINITIALIZED);
-  DoLoadGlobal(ic, assembler);
+  DoLdaGlobal(ic, assembler);
 }
 
 // LdaGlobalInsideTypeof <name_index> <slot>
 //
 // Load the global with name in constant pool entry <name_index> into the
 // accumulator using FeedBackVector slot <slot> inside of a typeof.
 void Interpreter::DoLdaGlobalInsideTypeof(InterpreterAssembler* assembler) {
   Callable ic = CodeFactory::LoadICInOptimizedCode(isolate_, INSIDE_TYPEOF,
                                                    UNINITIALIZED);
-  DoLoadGlobal(ic, assembler);
+  DoLdaGlobal(ic, assembler);
 }
 
-void Interpreter::DoStoreGlobal(Callable ic, InterpreterAssembler* assembler) {
+void Interpreter::DoStaGlobal(Callable ic, InterpreterAssembler* assembler) {
   // Get the global object.
   Node* context = __ GetContext();
   Node* native_context =
       __ LoadContextSlot(context, Context::NATIVE_CONTEXT_INDEX);
   Node* global = __ LoadContextSlot(native_context, Context::EXTENSION_INDEX);
 
   // Store the global via the StoreIC.
   Node* code_target = __ HeapConstant(ic.code());
   Node* constant_index = __ BytecodeOperandIdx(0);
   Node* name = __ LoadConstantPoolEntry(constant_index);
   Node* value = __ GetAccumulator();
   Node* raw_slot = __ BytecodeOperandIdx(1);
   Node* smi_slot = __ SmiTag(raw_slot);
   Node* type_feedback_vector = __ LoadTypeFeedbackVector();
   __ CallStub(ic.descriptor(), code_target, context, global, name, value,
               smi_slot, type_feedback_vector);
   __ Dispatch();
 }
 
 
 // StaGlobalSloppy <name_index> <slot>
 //
 // Store the value in the accumulator into the global with name in constant pool
 // entry <name_index> using FeedBackVector slot <slot> in sloppy mode.
 void Interpreter::DoStaGlobalSloppy(InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::StoreICInOptimizedCode(isolate_, SLOPPY, UNINITIALIZED);
-  DoStoreGlobal(ic, assembler);
+  DoStaGlobal(ic, assembler);
 }
 
 
 // StaGlobalStrict <name_index> <slot>
 //
 // Store the value in the accumulator into the global with name in constant pool
 // entry <name_index> using FeedBackVector slot <slot> in strict mode.
 void Interpreter::DoStaGlobalStrict(InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::StoreICInOptimizedCode(isolate_, STRICT, UNINITIALIZED);
-  DoStoreGlobal(ic, assembler);
+  DoStaGlobal(ic, assembler);
+}
+
+compiler::Node* Interpreter::BuildLoadContextSlot(
+    InterpreterAssembler* assembler) {
+  Node* reg_index = __ BytecodeOperandReg(0);
+  Node* context = __ LoadRegister(reg_index);
+  Node* slot_index = __ BytecodeOperandIdx(1);
+  return __ LoadContextSlot(context, slot_index);
 }
 
 // LdaContextSlot <context> <slot_index>
 //
 // Load the object in |slot_index| of |context| into the accumulator.
 void Interpreter::DoLdaContextSlot(InterpreterAssembler* assembler) {
-  Node* reg_index = __ BytecodeOperandReg(0);
-  Node* context = __ LoadRegister(reg_index);
-  Node* slot_index = __ BytecodeOperandIdx(1);
-  Node* result = __ LoadContextSlot(context, slot_index);
+  Node* result = BuildLoadContextSlot(assembler);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 // StaContextSlot <context> <slot_index>
 //
 // Stores the object in the accumulator into |slot_index| of |context|.
 void Interpreter::DoStaContextSlot(InterpreterAssembler* assembler) {
   Node* value = __ GetAccumulator();
   Node* reg_index = __ BytecodeOperandReg(0);
   Node* context = __ LoadRegister(reg_index);
   Node* slot_index = __ BytecodeOperandIdx(1);
   __ StoreContextSlot(context, slot_index, value);
   __ Dispatch();
 }
 
-void Interpreter::DoLoadLookupSlot(Runtime::FunctionId function_id,
-                                   InterpreterAssembler* assembler) {
+void Interpreter::DoLdaLookupSlot(Runtime::FunctionId function_id,
+                                  InterpreterAssembler* assembler) {
   Node* index = __ BytecodeOperandIdx(0);
   Node* name = __ LoadConstantPoolEntry(index);
   Node* context = __ GetContext();
   Node* result = __ CallRuntime(function_id, context, name);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 // LdaLookupSlot <name_index>
 //
 // Lookup the object with the name in constant pool entry |name_index|
 // dynamically.
 void Interpreter::DoLdaLookupSlot(InterpreterAssembler* assembler) {
-  DoLoadLookupSlot(Runtime::kLoadLookupSlot, assembler);
+  DoLdaLookupSlot(Runtime::kLoadLookupSlot, assembler);
 }
 
 // LdaLookupSlotInsideTypeof <name_index>
 //
 // Lookup the object with the name in constant pool entry |name_index|
 // dynamically without causing a NoReferenceError.
 void Interpreter::DoLdaLookupSlotInsideTypeof(InterpreterAssembler* assembler) {
-  DoLoadLookupSlot(Runtime::kLoadLookupSlotInsideTypeof, assembler);
+  DoLdaLookupSlot(Runtime::kLoadLookupSlotInsideTypeof, assembler);
 }
 
-void Interpreter::DoStoreLookupSlot(LanguageMode language_mode,
-                                    InterpreterAssembler* assembler) {
+void Interpreter::DoStaLookupSlot(LanguageMode language_mode,
+                                  InterpreterAssembler* assembler) {
   Node* value = __ GetAccumulator();
   Node* index = __ BytecodeOperandIdx(0);
   Node* name = __ LoadConstantPoolEntry(index);
   Node* context = __ GetContext();
   Node* result = __ CallRuntime(is_strict(language_mode)
                                     ? Runtime::kStoreLookupSlot_Strict
                                     : Runtime::kStoreLookupSlot_Sloppy,
                                 context, name, value);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 // StaLookupSlotSloppy <name_index>
 //
 // Store the object in accumulator to the object with the name in constant
 // pool entry |name_index| in sloppy mode.
 void Interpreter::DoStaLookupSlotSloppy(InterpreterAssembler* assembler) {
-  DoStoreLookupSlot(LanguageMode::SLOPPY, assembler);
+  DoStaLookupSlot(LanguageMode::SLOPPY, assembler);
 }
 
 
 // StaLookupSlotStrict <name_index>
 //
 // Store the object in accumulator to the object with the name in constant
 // pool entry |name_index| in strict mode.
 void Interpreter::DoStaLookupSlotStrict(InterpreterAssembler* assembler) {
-  DoStoreLookupSlot(LanguageMode::STRICT, assembler);
+  DoStaLookupSlot(LanguageMode::STRICT, assembler);
 }
 
-void Interpreter::DoLoadIC(Callable ic, InterpreterAssembler* assembler) {
+Node* Interpreter::BuildLoadNamedProperty(Callable ic,
+                                          InterpreterAssembler* assembler) {
   Node* code_target = __ HeapConstant(ic.code());
   Node* register_index = __ BytecodeOperandReg(0);
   Node* object = __ LoadRegister(register_index);
   Node* constant_index = __ BytecodeOperandIdx(1);
   Node* name = __ LoadConstantPoolEntry(constant_index);
   Node* raw_slot = __ BytecodeOperandIdx(2);
   Node* smi_slot = __ SmiTag(raw_slot);
   Node* type_feedback_vector = __ LoadTypeFeedbackVector();
   Node* context = __ GetContext();
-  Node* result = __ CallStub(ic.descriptor(), code_target, context, object,
-                             name, smi_slot, type_feedback_vector);
+  return __ CallStub(ic.descriptor(), code_target, context, object, name,
+                     smi_slot, type_feedback_vector);
+}
+
+// LdaNamedProperty <object> <name_index> <slot>
+//
+// Calls the LoadIC at FeedBackVector slot <slot> for <object> and the name at
+// constant pool entry <name_index>.
+void Interpreter::DoLdaNamedProperty(InterpreterAssembler* assembler) {
+  Callable ic = CodeFactory::LoadICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF,
+                                                   UNINITIALIZED);
+  Node* result = BuildLoadNamedProperty(ic, assembler);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
-// LoadIC <object> <name_index> <slot>
-//
-// Calls the LoadIC at FeedBackVector slot <slot> for <object> and the name at
-// constant pool entry <name_index>.
-void Interpreter::DoLoadIC(InterpreterAssembler* assembler) {
-  Callable ic = CodeFactory::LoadICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF,
-                                                   UNINITIALIZED);
-  DoLoadIC(ic, assembler);
-}
-
-void Interpreter::DoKeyedLoadIC(Callable ic, InterpreterAssembler* assembler) {
+Node* Interpreter::BuildLoadKeyedProperty(Callable ic,
+                                          InterpreterAssembler* assembler) {
   Node* code_target = __ HeapConstant(ic.code());
   Node* reg_index = __ BytecodeOperandReg(0);
   Node* object = __ LoadRegister(reg_index);
   Node* name = __ GetAccumulator();
   Node* raw_slot = __ BytecodeOperandIdx(1);
   Node* smi_slot = __ SmiTag(raw_slot);
   Node* type_feedback_vector = __ LoadTypeFeedbackVector();
   Node* context = __ GetContext();
-  Node* result = __ CallStub(ic.descriptor(), code_target, context, object,
-                             name, smi_slot, type_feedback_vector);
+  return __ CallStub(ic.descriptor(), code_target, context, object, name,
+                     smi_slot, type_feedback_vector);
+}
+
+// LdaKeyedProperty <object> <slot>
+//
+// Calls the KeyedLoadIC at FeedBackVector slot <slot> for <object> and the key
+// in the accumulator.
+void Interpreter::DoLdaKeyedProperty(InterpreterAssembler* assembler) {
+  Callable ic =
+      CodeFactory::KeyedLoadICInOptimizedCode(isolate_, UNINITIALIZED);
+  Node* result = BuildLoadKeyedProperty(ic, assembler);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
-// KeyedLoadIC <object> <slot>
-//
-// Calls the KeyedLoadIC at FeedBackVector slot <slot> for <object> and the key
-// in the accumulator.
-void Interpreter::DoKeyedLoadIC(InterpreterAssembler* assembler) {
-  Callable ic =
-      CodeFactory::KeyedLoadICInOptimizedCode(isolate_, UNINITIALIZED);
-  DoKeyedLoadIC(ic, assembler);
-}
-
-void Interpreter::DoStoreIC(Callable ic, InterpreterAssembler* assembler) {
+void Interpreter::DoStaNamedProperty(Callable ic,
+                                     InterpreterAssembler* assembler) {
   Node* code_target = __ HeapConstant(ic.code());
   Node* object_reg_index = __ BytecodeOperandReg(0);
   Node* object = __ LoadRegister(object_reg_index);
   Node* constant_index = __ BytecodeOperandIdx(1);
   Node* name = __ LoadConstantPoolEntry(constant_index);
   Node* value = __ GetAccumulator();
   Node* raw_slot = __ BytecodeOperandIdx(2);
   Node* smi_slot = __ SmiTag(raw_slot);
   Node* type_feedback_vector = __ LoadTypeFeedbackVector();
   Node* context = __ GetContext();
   __ CallStub(ic.descriptor(), code_target, context, object, name, value,
               smi_slot, type_feedback_vector);
   __ Dispatch();
 }
 
-
-// StoreICSloppy <object> <name_index> <slot>
+// StaNamedPropertySloppy <object> <name_index> <slot>
 //
 // Calls the sloppy mode StoreIC at FeedBackVector slot <slot> for <object> and
 // the name in constant pool entry <name_index> with the value in the
 // accumulator.
-void Interpreter::DoStoreICSloppy(InterpreterAssembler* assembler) {
+void Interpreter::DoStaNamedPropertySloppy(InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::StoreICInOptimizedCode(isolate_, SLOPPY, UNINITIALIZED);
-  DoStoreIC(ic, assembler);
+  DoStaNamedProperty(ic, assembler);
 }
 
-
-// StoreICStrict <object> <name_index> <slot>
+// StaNamedPropertyStrict <object> <name_index> <slot>
 //
 // Calls the strict mode StoreIC at FeedBackVector slot <slot> for <object> and
 // the name in constant pool entry <name_index> with the value in the
 // accumulator.
-void Interpreter::DoStoreICStrict(InterpreterAssembler* assembler) {
+void Interpreter::DoStaNamedPropertyStrict(InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::StoreICInOptimizedCode(isolate_, STRICT, UNINITIALIZED);
-  DoStoreIC(ic, assembler);
+  DoStaNamedProperty(ic, assembler);
 }
 
-void Interpreter::DoKeyedStoreIC(Callable ic, InterpreterAssembler* assembler) {
+void Interpreter::DoStaKeyedProperty(Callable ic,
+                                     InterpreterAssembler* assembler) {
   Node* code_target = __ HeapConstant(ic.code());
   Node* object_reg_index = __ BytecodeOperandReg(0);
   Node* object = __ LoadRegister(object_reg_index);
   Node* name_reg_index = __ BytecodeOperandReg(1);
   Node* name = __ LoadRegister(name_reg_index);
   Node* value = __ GetAccumulator();
   Node* raw_slot = __ BytecodeOperandIdx(2);
   Node* smi_slot = __ SmiTag(raw_slot);
   Node* type_feedback_vector = __ LoadTypeFeedbackVector();
   Node* context = __ GetContext();
   __ CallStub(ic.descriptor(), code_target, context, object, name, value,
               smi_slot, type_feedback_vector);
   __ Dispatch();
 }
 
-
-// KeyedStoreICSloppy <object> <key> <slot>
+// StaKeyedPropertySloppy <object> <key> <slot>
 //
 // Calls the sloppy mode KeyStoreIC at FeedBackVector slot <slot> for <object>
 // and the key <key> with the value in the accumulator.
-void Interpreter::DoKeyedStoreICSloppy(InterpreterAssembler* assembler) {
+void Interpreter::DoStaKeyedPropertySloppy(InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::KeyedStoreICInOptimizedCode(isolate_, SLOPPY, UNINITIALIZED);
-  DoKeyedStoreIC(ic, assembler);
+  DoStaKeyedProperty(ic, assembler);
 }
 
-
-// KeyedStoreICStore <object> <key> <slot>
+// StaKeyedPropertyStrict <object> <key> <slot>
 //
 // Calls the strict mode KeyStoreIC at FeedBackVector slot <slot> for <object>
 // and the key <key> with the value in the accumulator.
-void Interpreter::DoKeyedStoreICStrict(InterpreterAssembler* assembler) {
+void Interpreter::DoStaKeyedPropertyStrict(InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::KeyedStoreICInOptimizedCode(isolate_, STRICT, UNINITIALIZED);
-  DoKeyedStoreIC(ic, assembler);
+  DoStaKeyedProperty(ic, assembler);
 }
 
 // PushContext <context>
 //
 // Saves the current context in <context>, and pushes the accumulator as the
 // new current context.
 void Interpreter::DoPushContext(InterpreterAssembler* assembler) {
   Node* reg_index = __ BytecodeOperandReg(0);
   Node* new_context = __ GetAccumulator();
   Node* old_context = __ GetContext();
@@ skipping 1095 matching lines @@
 // An invalid bytecode aborting execution if dispatched.
 void Interpreter::DoIllegal(InterpreterAssembler* assembler) {
   __ Abort(kInvalidBytecode);
 }
 
 // Nop
 //
 // No operation.
 void Interpreter::DoNop(InterpreterAssembler* assembler) { __ Dispatch(); }
 
+// LdrUndefined <reg>
+//
+// Loads undefined into the accumulator and |reg|.

[rmcilroy, 2016/05/17 15:49:33]

nit - also group these near Lda variants please

[oth, 2016/05/18 20:22:25]

Done.

+void Interpreter::DoLdrUndefined(InterpreterAssembler* assembler) {
+  Node* result = BuildLoadUndefined(assembler);
+  Node* destination = __ BytecodeOperandReg(0);
+  __ StoreRegister(result, destination);
+  __ Dispatch();
+}
+
+// LdrContextSlot <context> <slot_index> <reg>
+//
+// Load the object in <slot_index> of <context> into register <reg>.
+void Interpreter::DoLdrContextSlot(InterpreterAssembler* assembler) {
+  Node* result = BuildLoadContextSlot(assembler);
+  Node* destination = __ BytecodeOperandReg(2);
+  __ StoreRegister(result, destination);
+  __ Dispatch();
+}
+
+// LdrGlobal <name_index> <slot> <reg>
+//
+// Load the global with name in constant pool entry <name_index> into
+// register <reg> using FeedBackVector slot <slot> outside of a typeof.
+void Interpreter::DoLdrGlobal(InterpreterAssembler* assembler) {
+  Callable ic = CodeFactory::LoadICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF,
+                                                   UNINITIALIZED);
+  Node* result = BuildLoadGlobal(ic, assembler);
+  Node* destination = __ BytecodeOperandReg(2);
+  __ StoreRegister(result, destination);
+  __ Dispatch();
+}
+
+// LdrNamedProperty <object> <name_index> <slot> <reg>
+//
+// Calls the LoadIC at FeedBackVector slot <slot> for <object> and the name at
+// constant pool entry <name_index> and puts the result into register <reg>.
+void Interpreter::DoLdrNamedProperty(InterpreterAssembler* assembler) {
+  Callable ic = CodeFactory::LoadICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF,
+                                                   UNINITIALIZED);
+  Node* result = BuildLoadNamedProperty(ic, assembler);
+  Node* destination = __ BytecodeOperandReg(3);
+  __ StoreRegister(result, destination);
+  __ Dispatch();
+}
+
+// LdrKeyedProperty <object> <slot> <reg>
+//
+// Calls the KeyedLoadIC at FeedBackVector slot <slot> for <object> and the key
+// in the accumulator and puts the result in register <reg>.
+void Interpreter::DoLdrKeyedProperty(InterpreterAssembler* assembler) {
+  Callable ic =
+      CodeFactory::KeyedLoadICInOptimizedCode(isolate_, UNINITIALIZED);
+  Node* result = BuildLoadKeyedProperty(ic, assembler);
+  Node* destination = __ BytecodeOperandReg(2);
+  __ StoreRegister(result, destination);
+  __ Dispatch();
+}
+
 // SuspendGenerator <generator>
 //
 // Exports the register file and stores it into the generator.  Also stores the
 // current context and the state given in the accumulator into the generator.
 void Interpreter::DoSuspendGenerator(InterpreterAssembler* assembler) {
   Node* generator_reg = __ BytecodeOperandReg(0);
   Node* generator = __ LoadRegister(generator_reg);
 
   Node* array =
       __ LoadObjectField(generator, JSGeneratorObject::kOperandStackOffset);
@@ skipping 25 matching lines @@
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8