[interpreter] Inline Star on dispatch for some bytecodes

src/interpreter/interpreter-assembler.h

Index: src/interpreter/interpreter-assembler.h
diff --git a/src/interpreter/interpreter-assembler.h b/src/interpreter/interpreter-assembler.h
index 183d4ddaefff1e11306170eea5be41dee460e64a..259cd2f03b49f076ad8d391a924be9c6261da6fe 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -67,6 +67,9 @@ class InterpreterAssembler : public CodeStubAssembler {
   compiler::Node* StoreRegister(compiler::Node* value,
                                 compiler::Node* reg_index);
 
+  // Build nodes for Star and don't dispatch
+  compiler::Node* StoreAccumulatorToRegister();
+
   // Returns the next consecutive register.
   compiler::Node* NextRegister(compiler::Node* reg_index);
 
@@ -218,14 +221,30 @@ class InterpreterAssembler : public CodeStubAssembler {
   // JumpIfWordNotEqual.
   void JumpConditional(compiler::Node* condition, compiler::Node* jump_offset);
 
+  // Returns BytecodeOffset() advanced by the current bytecode's size.
+  // Note: this does not update BytecodeOffset() itself.
+  compiler::Node* Advance();
+
   // Returns BytecodeOffset() advanced by delta bytecodes. Note: this does not
   // update BytecodeOffset() itself.
   compiler::Node* Advance(int delta);
   compiler::Node* Advance(compiler::Node* delta);
 
+  // Load the bytecode at |bytecode_offset|.
+  compiler::Node* LoadBytecode(compiler::Node* bytecode_offset);
+
   // Starts next instruction dispatch at |new_bytecode_offset|.
   compiler::Node* DispatchTo(compiler::Node* new_bytecode_offset);
 
+  // Look ahead for Star and inline it, will bind the next bytecode to dispatch
+  // to, to |target_bytecode| and its offset to |target_offset|.
+  void InlineDispatchToStar(Variable& target_bytecode, Variable& target_offset);
+
+  // Dispatch to |target_bytecode| at |new_bytecode_offset|.
+  // |target_bytecode| should be equivalent to loading from the offset.
+  compiler::Node* DispatchToLoaded(compiler::Node* target_bytecode,
+                                   compiler::Node* new_bytecode_offset);
+
   // Dispatch to the bytecode handler with code offset |handler|.
   compiler::Node* DispatchToBytecodeHandler(compiler::Node* handler,
                                             compiler::Node* bytecode_offset);
@@ -237,6 +256,7 @@ class InterpreterAssembler : public CodeStubAssembler {
   OperandScale operand_scale() const { return operand_scale_; }
 
   Bytecode bytecode_;
+  CodeStubAssembler::Variable bytecode_offset_;
   OperandScale operand_scale_;
   CodeStubAssembler::Variable interpreted_frame_pointer_;
   CodeStubAssembler::Variable accumulator_;