--- a/c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/HotSpotTypeResolvedImpl.java	Mon Apr 11 10:37:24 2011 +0200
+++ b/c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/HotSpotTypeResolvedImpl.java	Mon Apr 11 11:25:06 2011 +0200
@@ -127,7 +127,7 @@
     }
 
     @Override
-    public boolean isInstance(Object obj) {
+    public boolean isInstance(CiConstant obj) {
         return javaMirror.isInstance(obj);
     }
 
@@ -148,7 +148,7 @@
 
     @Override
     public boolean isSubtypeOf(RiType other) {
-        if (other.isResolved()) {
+        if (other instanceof HotSpotTypeResolved) {
             return compiler.getVMEntries().RiType_isSubtypeOf(this, other);
         }
         // No resolved type is a subtype of an unresolved type.