Reduce size of LIR instruction by one word and remove dead code.

src/mips/lithium-mips.h

 // Copyright 2012 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
@@ skipping 185 matching lines @@
   H##type* hydrogen() const {               \
     return H##type::cast(hydrogen_value()); \
   }
 
 
 class LInstruction: public ZoneObject {
  public:
   LInstruction()
       :  environment_(NULL),
          hydrogen_value_(NULL),
-         is_call_(false),
-         is_save_doubles_(false) { }
+         is_call_(false) { }
   virtual ~LInstruction() { }
 
   virtual void CompileToNative(LCodeGen* generator) = 0;
   virtual const char* Mnemonic() const = 0;
   virtual void PrintTo(StringStream* stream);
   virtual void PrintDataTo(StringStream* stream) = 0;
   virtual void PrintOutputOperandTo(StringStream* stream) = 0;
 
   enum Opcode {
     // Declare a unique enum value for each instruction.
@@ skipping 21 matching lines @@
   LEnvironment* environment() const { return environment_; }
   bool HasEnvironment() const { return environment_ != NULL; }
 
   void set_pointer_map(LPointerMap* p) { pointer_map_.set(p); }
   LPointerMap* pointer_map() const { return pointer_map_.get(); }
   bool HasPointerMap() const { return pointer_map_.is_set(); }
 
   void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
   HValue* hydrogen_value() const { return hydrogen_value_; }
 
-  void set_deoptimization_environment(LEnvironment* env) {
-    deoptimization_environment_.set(env);
-  }
-  LEnvironment* deoptimization_environment() const {
-    return deoptimization_environment_.get();
-  }
-  bool HasDeoptimizationEnvironment() const {
-    return deoptimization_environment_.is_set();
-  }
+  virtual void SetDeferredLazyDeoptimizationEnvironment(LEnvironment* env) { }
 
   void MarkAsCall() { is_call_ = true; }
-  void MarkAsSaveDoubles() { is_save_doubles_ = true; }
 
   // Interface to the register allocator and iterators.
   bool IsMarkedAsCall() const { return is_call_; }
-  bool IsMarkedAsSaveDoubles() const { return is_save_doubles_; }
 
   virtual bool HasResult() const = 0;
   virtual LOperand* result() = 0;
 
   virtual int InputCount() = 0;
   virtual LOperand* InputAt(int i) = 0;
   virtual int TempCount() = 0;
   virtual LOperand* TempAt(int i) = 0;
 
   LOperand* FirstInput() { return InputAt(0); }
   LOperand* Output() { return HasResult() ? result() : NULL; }
 
 #ifdef DEBUG
   void VerifyCall();
 #endif
 
  private:
   LEnvironment* environment_;
   SetOncePointer<LPointerMap> pointer_map_;
   HValue* hydrogen_value_;
-  SetOncePointer<LEnvironment> deoptimization_environment_;
   bool is_call_;
   bool is_save_doubles_;
 };
 
 
 // R = number of result operands (0 or 1).
 // I = number of input operands.
 // T = number of temporary operands.
 template<int R, int I, int T>
 class LTemplateInstruction: public LInstruction {
@@ skipping 530 matching lines @@
   LInstanceOfKnownGlobal(LOperand* value, LOperand* temp) {
     inputs_[0] = value;
     temps_[0] = temp;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(InstanceOfKnownGlobal,
                                "instance-of-known-global")
   DECLARE_HYDROGEN_ACCESSOR(InstanceOfKnownGlobal)
 
   Handle<JSFunction> function() const { return hydrogen()->function(); }
+  LEnvironment* GetDeferredLazyDeoptimizationEnvironment() {
+    return lazy_deopt_env_;
+  }
+  virtual void SetDeferredLazyDeoptimizationEnvironment(LEnvironment* env) {
+    lazy_deopt_env_ = env;
+  }
+
+ private:
+  LEnvironment* lazy_deopt_env_;
 };
 
 
 class LBoundsCheck: public LTemplateInstruction<0, 2, 0> {
  public:
   LBoundsCheck(LOperand* index, LOperand* length) {
     inputs_[0] = index;
     inputs_[1] = length;
   }
 
@@ skipping 1509 matching lines @@
 
   enum CanDeoptimize { CAN_DEOPTIMIZE_EAGERLY, CANNOT_DEOPTIMIZE_EAGERLY };
 
   // By default we assume that instruction sequences generated for calls
   // cannot deoptimize eagerly and we do not attach environment to this
   // instruction.
   LInstruction* MarkAsCall(
       LInstruction* instr,
       HInstruction* hinstr,
       CanDeoptimize can_deoptimize = CANNOT_DEOPTIMIZE_EAGERLY);
-  LInstruction* MarkAsSaveDoubles(LInstruction* instr);
-
-  LInstruction* SetInstructionPendingDeoptimizationEnvironment(
-      LInstruction* instr, int ast_id);
-  void ClearInstructionPendingDeoptimizationEnvironment();
 
   LEnvironment* CreateEnvironment(HEnvironment* hydrogen_env,
                                   int* argument_index_accumulator);
 
   void VisitInstruction(HInstruction* current);
 
   void DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block);
   LInstruction* DoBit(Token::Value op, HBitwiseBinaryOperation* instr);
   LInstruction* DoShift(Token::Value op, HBitwiseBinaryOperation* instr);
   LInstruction* DoArithmeticD(Token::Value op,
@@ skipping 17 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_MIPS_LITHIUM_MIPS_H_