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

src/arm/lithium-arm.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 83 matching lines @@
 //   LOsrEntry
 //   LParameter
 //   LStackCheck
 //   LStoreKeyed
 //     LStoreKeyedFastElement
 //     LStoreKeyedGeneric
 //   LStoreNamed
 //     LStoreNamedField
 //     LStoreNamedGeneric
 //   LUnaryOperation
-//     LArrayLength
+//     LJSArrayLength
+//     LFixedArrayLength
 //     LBitNotI
 //     LBranch
 //     LCallNew
 //     LCheckFunction
 //     LCheckInstanceType
 //     LCheckMap
 //     LCheckPrototypeMaps
 //     LCheckSmi
 //     LClassOfTest
 //     LClassOfTestAndBranch
@@ skipping 40 matching lines @@
 
 
 #define LITHIUM_CONCRETE_INSTRUCTION_LIST(V)    \
   V(AccessArgumentsAt)                          \
   V(AddI)                                       \
   V(ApplyArguments)                             \
   V(ArgumentsElements)                          \
   V(ArgumentsLength)                            \
   V(ArithmeticD)                                \
   V(ArithmeticT)                                \
-  V(ArrayLength)                                \
   V(ArrayLiteral)                               \
   V(BitI)                                       \
   V(BitNotI)                                    \
   V(BoundsCheck)                                \
   V(Branch)                                     \
   V(CallConstantFunction)                       \
   V(CallFunction)                               \
   V(CallGlobal)                                 \
   V(CallKeyed)                                  \
   V(CallKnownGlobal)                            \
@@ skipping 13 matching lines @@
   V(CmpMapAndBranch)                            \
   V(CmpT)                                       \
   V(CmpTAndBranch)                              \
   V(ConstantD)                                  \
   V(ConstantI)                                  \
   V(ConstantT)                                  \
   V(DeleteProperty)                             \
   V(Deoptimize)                                 \
   V(DivI)                                       \
   V(DoubleToI)                                  \
+  V(FixedArrayLength)                           \
   V(FunctionLiteral)                            \
   V(Gap)                                        \
   V(GlobalObject)                               \
   V(GlobalReceiver)                             \
   V(Goto)                                       \
   V(InstanceOf)                                 \
   V(InstanceOfAndBranch)                        \
   V(Integer32ToDouble)                          \
   V(IsNull)                                     \
   V(IsNullAndBranch)                            \
   V(IsObject)                                   \
   V(IsObjectAndBranch)                          \
   V(IsSmi)                                      \
   V(IsSmiAndBranch)                             \
+  V(JSArrayLength)                              \
   V(HasInstanceType)                            \
   V(HasInstanceTypeAndBranch)                   \
   V(HasCachedArrayIndex)                        \
   V(HasCachedArrayIndexAndBranch)               \
   V(ClassOfTest)                                \
   V(ClassOfTestAndBranch)                       \
   V(Label)                                      \
   V(LazyBailout)                                \
   V(LoadElements)                               \
   V(LoadGlobal)                                 \
@@ skipping 913 matching lines @@
   int true_block_id() const { return true_block_id_; }
   int false_block_id() const { return false_block_id_; }
 
  private:
   Handle<Map> map_;
   int true_block_id_;
   int false_block_id_;
 };
 
 
-class LArrayLength: public LUnaryOperation {
+class LJSArrayLength: public LUnaryOperation {
  public:
-  LArrayLength(LOperand* input, LOperand* temporary)
-      : LUnaryOperation(input), temporary_(temporary) { }
+  explicit LJSArrayLength(LOperand* input) : LUnaryOperation(input) { }
 
-  LOperand* temporary() const { return temporary_; }
-
-  DECLARE_CONCRETE_INSTRUCTION(ArrayLength, "array-length")
-  DECLARE_HYDROGEN_ACCESSOR(ArrayLength)
-
- private:
-  LOperand* temporary_;
+  DECLARE_CONCRETE_INSTRUCTION(JSArrayLength, "js-array-length")
+  DECLARE_HYDROGEN_ACCESSOR(JSArrayLength)
 };
 
 
+class LFixedArrayLength: public LUnaryOperation {
+ public:
+  explicit LFixedArrayLength(LOperand* input) : LUnaryOperation(input) { }
+
+  DECLARE_CONCRETE_INSTRUCTION(FixedArrayLength, "fixed-array-length")
+  DECLARE_HYDROGEN_ACCESSOR(FixedArrayLength)
+};
+
+
 class LValueOf: public LUnaryOperation {
  public:
   LValueOf(LOperand* input, LOperand* temporary)
       : LUnaryOperation(input), temporary_(temporary) { }
 
   LOperand* temporary() const { return temporary_; }
 
   DECLARE_CONCRETE_INSTRUCTION(ValueOf, "value-of")
   DECLARE_HYDROGEN_ACCESSOR(ValueOf)
 
@@ skipping 953 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_LITHIUM_ARM_H_