Replace a set of Hydrogen instructions with rotate instructions on ARM

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 12582)
+++ src/hydrogen-instructions.h	(working copy)
@@ -153,6 +153,7 @@
   V(Random)                                    \
   V(RegExpLiteral)                             \
   V(Return)                                    \
+  V(Ror)                                       \
   V(Sar)                                       \
   V(Shl)                                       \
   V(Shr)                                       \
@@ -3630,6 +3631,27 @@
 };
 
 
+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)