diff -r 3c768dca60f5 -r fd87432a895b hotspot/src/share/vm/opto/cfgnode.cpp
--- a/hotspot/src/share/vm/opto/cfgnode.cpp	Sat Jan 07 13:26:43 2012 -0800
+++ b/hotspot/src/share/vm/opto/cfgnode.cpp	Tue Jan 10 18:05:38 2012 -0800
@@ -1597,7 +1597,7 @@
       bool is_loop = (r->is_Loop() && r->req() == 3);
       // Then, check if there is a data loop when phi references itself directly
       // or through other data nodes.
-      if (is_loop && !phase->eqv_uncast(uin, in(LoopNode::EntryControl)) ||
+      if (is_loop && !uin->eqv_uncast(in(LoopNode::EntryControl)) ||
          !is_loop && is_unsafe_data_reference(uin)) {
         // Break this data loop to avoid creation of a dead loop.
         if (can_reshape) {