Crankshaft support for IN.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index b7d5d6b616f8d5489b131e33582a006728db9e83..299aa76f449928f9cfc5944354155bb7dc4e8139 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -104,6 +104,7 @@ class LChunkBuilder;
   V(Goto)                                      \
   V(HasInstanceType)                           \
   V(HasCachedArrayIndex)                       \
+  V(In)                                        \
   V(InstanceOf)                                \
   V(InstanceOfKnownGlobal)                     \
   V(InvokeFunction)                            \
@@ -3780,6 +3781,28 @@ class HDeleteProperty: public HBinaryOperation {
   HValue* key() { return right(); }
 };
 
+
+class HIn: public HTemplateInstruction<2> {
+ public:
+  HIn(HValue* key, HValue* object) {
+    SetOperandAt(0, key);
+    SetOperandAt(1, object);
+    set_representation(Representation::Tagged());
+    SetAllSideEffects();
+  }
+
+  HValue* key() { return OperandAt(0); }
+  HValue* object() { return OperandAt(1); }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Tagged();
+  }
+

[fschneider, 2011/04/26 13:51:59]

You should override CalculateInferredType to return Boolean.

+  virtual void PrintDataTo(StringStream* stream);
+
+  DECLARE_CONCRETE_INSTRUCTION(In)
+};
+
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION