[interpreter]: Changes to interpreter builtins for accumulator and register file registers.

src/compiler/interpreter-assembler.h

Index: src/compiler/interpreter-assembler.h
diff --git a/src/compiler/interpreter-assembler.h b/src/compiler/interpreter-assembler.h
index ead7b92d7aa8b6792398e0308ece8cdf844c4f7b..7d095c9be49d8de0d2f7cad45c827a506d491ead 100644
--- a/src/compiler/interpreter-assembler.h
+++ b/src/compiler/interpreter-assembler.h
@@ -22,9 +22,7 @@ class Zone;
 namespace compiler {
 
 class CallDescriptor;
-class CommonOperatorBuilder;
 class Graph;
-class MachineOperatorBuilder;
 class Node;
 class Operator;
 class RawMachineAssembler;
@@ -38,33 +36,29 @@ class InterpreterAssembler {
 
   Handle<Code> GenerateCode();
 
+  // Accumulator.
+  Node* GetAccumulator();
+  void SetAccumulator(Node* value);
+
+  // Loads from and stores to the interpreter register file.
+  Node* LoadRegister(Node* reg_index);
+  Node* StoreRegister(Node* value, Node* reg_index);
+
   // Constants.
   Node* Int32Constant(int value);
   Node* NumberConstant(double value);
   Node* HeapConstant(Unique<HeapObject> object);
 
-  // Returns the bytecode operand |index| for the current bytecode.
-  Node* BytecodeOperand(int index);
-
-  // Loads from and stores to the interpreter register file.
-  Node* LoadRegister(int index);
-  Node* LoadRegister(Node* index);
-  Node* StoreRegister(Node* value, int index);
-  Node* StoreRegister(Node* value, Node* index);
-
   // Returns from the function.
   void Return();
 
   // Dispatch to the bytecode.
   void Dispatch();
 
- protected:
-  static const int kFirstRegisterOffsetFromFp =
-      -kPointerSize - StandardFrameConstants::kFixedFrameSizeFromFp;
-
-  // TODO(rmcilroy): Increase this when required.
-  static const int kMaxRegisterIndex = 255;
+  Node* BytecodeOperand(int index);
+  Node* BytecodeOperandSignExtended(int index);
 
+ protected:
   // Close the graph.
   void End();
 
@@ -73,17 +67,16 @@ class InterpreterAssembler {
   Graph* graph();
 
  private:
+  // Returns a raw pointer to start of the register file on the stack.
+  Node* RegisterFileRawPointer();
   // Returns a tagged pointer to the current function's BytecodeArray object.
-  Node* BytecodeArrayPointer();
+  Node* BytecodeArrayTaggedPointer();
   // Returns the offset from the BytecodeArrayPointer of the current bytecode.
   Node* BytecodeOffset();
   // Returns a pointer to first entry in the interpreter dispatch table.
-  Node* DispatchTablePointer();
-  // Returns the frame pointer for the current function.
-  Node* FramePointer();
+  Node* DispatchTableRawPointer();
 
-  // Returns the offset of register |index|.
-  Node* RegisterFrameOffset(int index);
+  // Returns the offset of register |index| relative to RegisterFilePointer().
   Node* RegisterFrameOffset(Node* index);
 
   // Returns BytecodeOffset() advanced by delta bytecodes. Note: this does not
@@ -96,12 +89,11 @@ class InterpreterAssembler {
   // Private helpers which delegate to RawMachineAssembler.
   Isolate* isolate();
   Schedule* schedule();
-  MachineOperatorBuilder* machine();
-  CommonOperatorBuilder* common();
 
   interpreter::Bytecode bytecode_;
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
   Node* end_node_;
+  Node* accumulator_;
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);