*** old/hotspot/src/share/vm/ci/ciConstant.hpp	Wed Sep  4 13:51:26 2013
--- new/hotspot/src/share/vm/ci/ciConstant.hpp	Wed Sep  4 13:51:26 2013

*** 39,49 ****
--- 39,48 ----
  
    BasicType _type;
    union {
      jint      _int;
      jlong     _long;
      jint      _long_half[2];
      jfloat    _float;
      jdouble   _double;
      ciObject* _object;
    } _value;
  

*** 109,118 ****
--- 108,131 ----
    ciObject* as_object() const {
      assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
      return _value._object;
    }
  
+   bool      is_null_or_zero() const {
+     if (!is_java_primitive(basic_type())) {
+       return as_object()->is_null_object();
+     } else if (type2size[basic_type()] == 1) {
+       // treat float bits as int, to avoid comparison with -0 and NaN
+       return (_value._int == 0);
+     } else if (type2size[basic_type()] == 2) {
+       // treat double bits as long, to avoid comparison with -0 and NaN
+       return (_value._long == 0);
+     } else {
+       return false;
+     }
+   }
+ 
    // Debugging output
    void print();
  };
  
  #endif // SHARE_VM_CI_CICONSTANT_HPP