Optimize array-length and fast element loads....

src/hydrogen-instructions.h

 // Copyright 2010 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 100 matching lines @@
 //       HObjectLiteral
 //       HRegExpLiteral
 //     HOsrEntry
 //     HParameter
 //     HSimulate
 //     HStackCheck
 //     HStoreKeyed
 //       HStoreKeyedFastElement
 //       HStoreKeyedGeneric
 //     HUnaryOperation
-//       HArrayLength
 //       HBitNot
 //       HChange
 //       HCheckFunction
 //       HCheckInstanceType
 //       HCheckMap
 //       HCheckNonSmi
 //       HCheckPrototypeMaps
 //       HCheckSmi
 //       HDeleteProperty
+//       HFixedArrayLength
+//       HJSArrayLength
 //       HLoadElements
 //         HTypeofIs
 //       HLoadNamedField
 //       HLoadNamedGeneric
 //       HLoadFunctionPrototype
 //       HPushArgument
 //       HTypeof
 //       HUnaryMathOperation
 //       HUnaryPredicate
 //         HClassOfTest
@@ skipping 23 matching lines @@
   HYDROGEN_CONCRETE_INSTRUCTION_LIST(V)
 
 
 #define HYDROGEN_CONCRETE_INSTRUCTION_LIST(V)  \
   V(AccessArgumentsAt)                         \
   V(Add)                                       \
   V(ApplyArguments)                            \
   V(ArgumentsElements)                         \
   V(ArgumentsLength)                           \
   V(ArgumentsObject)                           \
-  V(ArrayLength)                               \
   V(ArrayLiteral)                              \
   V(BitAnd)                                    \
   V(BitNot)                                    \
   V(BitOr)                                     \
   V(BitXor)                                    \
   V(BlockEntry)                                \
   V(BoundsCheck)                               \
   V(Branch)                                    \
   V(CallConstantFunction)                      \
   V(CallFunction)                              \
@@ skipping 12 matching lines @@
   V(CheckPrototypeMaps)                        \
   V(CheckSmi)                                  \
   V(Compare)                                   \
   V(CompareJSObjectEq)                         \
   V(CompareMapAndBranch)                       \
   V(Constant)                                  \
   V(DeleteProperty)                            \
   V(Deoptimize)                                \
   V(Div)                                       \
   V(EnterInlined)                              \
+  V(FixedArrayLength)                          \
   V(FunctionLiteral)                           \
   V(GlobalObject)                              \
   V(GlobalReceiver)                            \
   V(Goto)                                      \
   V(InstanceOf)                                \
   V(IsNull)                                    \
   V(IsObject)                                  \
   V(IsSmi)                                     \
   V(HasInstanceType)                           \
   V(HasCachedArrayIndex)                       \
+  V(JSArrayLength)                             \
   V(ClassOfTest)                               \
   V(LeaveInlined)                              \
   V(LoadElements)                              \
   V(LoadGlobal)                                \
   V(LoadKeyedFastElement)                      \
   V(LoadKeyedGeneric)                          \
   V(LoadNamedField)                            \
   V(LoadNamedGeneric)                          \
   V(LoadFunctionPrototype)                     \
   V(Mod)                                       \
@@ skipping 1105 matching lines @@
   Handle<String> name() const { return name_; }
 
   DECLARE_CONCRETE_INSTRUCTION(CallRuntime, "call_runtime")
 
  private:
   Runtime::Function* c_function_;
   Handle<String> name_;
 };
 
 
-class HArrayLength: public HUnaryOperation {
+class HJSArrayLength: public HUnaryOperation {
  public:
-  explicit HArrayLength(HValue* value) : HUnaryOperation(value) {
+  explicit HJSArrayLength(HValue* value) : HUnaryOperation(value) {
     // The length of an array is stored as a tagged value in the array
     // object. It is guaranteed to be 32 bit integer, but it can be
     // represented as either a smi or heap number.
     set_representation(Representation::Tagged());
     SetFlag(kDependsOnArrayLengths);
     SetFlag(kUseGVN);
   }
 
   virtual Representation RequiredInputRepresentation(int index) const {
     return Representation::Tagged();
   }
 
-  DECLARE_CONCRETE_INSTRUCTION(ArrayLength, "array_length")
+  DECLARE_CONCRETE_INSTRUCTION(JSArrayLength, "js_array_length")
+};
+
+
+class HFixedArrayLength: public HUnaryOperation {
+ public:
+  explicit HFixedArrayLength(HValue* value) : HUnaryOperation(value) {
+    set_representation(Representation::Tagged());
+    SetFlag(kDependsOnArrayLengths);
+    SetFlag(kUseGVN);
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(FixedArrayLength, "fixed_array_length")
 };
 
 
 class HBitNot: public HUnaryOperation {
  public:
   explicit HBitNot(HValue* value) : HUnaryOperation(value) {
     set_representation(Representation::Integer32());
     SetFlag(kUseGVN);
     SetFlag(kTruncatingToInt32);
   }
@@ skipping 1612 matching lines @@
   HValue* object() const { return left(); }
   HValue* key() const { return right(); }
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_