Replace a set of Hydrogen instructions with rotate instructions on ARM

src/hydrogen-instructions.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 135 matching lines @@
   V(Mul)                                       \
   V(ObjectLiteral)                             \
   V(OsrEntry)                                  \
   V(OuterContext)                              \
   V(Parameter)                                 \
   V(Power)                                     \
   V(PushArgument)                              \
   V(Random)                                    \
   V(RegExpLiteral)                             \
   V(Return)                                    \
+  V(Ror)                                       \
   V(Sar)                                       \
   V(Shl)                                       \
   V(Shr)                                       \
   V(Simulate)                                  \
   V(SoftDeoptimize)                            \
   V(StackCheck)                                \
   V(StoreContextSlot)                          \
   V(StoreGlobalCell)                           \
   V(StoreGlobalGeneric)                        \
   V(StoreKeyedFastDoubleElement)               \
@@ skipping 3457 matching lines @@
                                HValue* left,
                                HValue* right);
 
   DECLARE_CONCRETE_INSTRUCTION(Shr)
 
  protected:
   virtual bool DataEquals(HValue* other) { return true; }
 };
 
 
+class HRor: public HBitwiseBinaryOperation {
+ public:
+  HRor(HValue* context, HValue* left, HValue* right)
+      : HBitwiseBinaryOperation(context, left, right) {
+    ChangeRepresentation(Representation::Integer32());

[Erik Corry, 2012/09/27 14:45:44]

Why is HRor different from all other bit ops here?

+    ClearAllSideEffects();
+  }
+
+  virtual Range* InferRange(Zone* zone);
+  static HInstruction* NewHRor(Zone* zone,
+                               HValue* context,
+                               HValue* left,
+                               HValue* right);
+
+  DECLARE_CONCRETE_INSTRUCTION(Ror)
+
+ protected:
+  virtual bool DataEquals(HValue* other) { return true; }
+};
+
+
 class HSar: public HBitwiseBinaryOperation {
  public:
   HSar(HValue* context, HValue* left, HValue* right)
       : HBitwiseBinaryOperation(context, left, right) { }
 
   virtual Range* InferRange(Zone* zone);
 
   static HInstruction* NewHSar(Zone* zone,
                                HValue* context,
                                HValue* left,
@@ skipping 1639 matching lines @@
   DECLARE_CONCRETE_INSTRUCTION(LoadFieldByIndex);
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_