--- a/src/share/vm/opto/compile.cpp	Fri Apr 05 18:53:57 2013 +0200
+++ b/src/share/vm/opto/compile.cpp	Sat Apr 06 20:04:06 2013 +0200
@@ -892,7 +892,7 @@
   : Phase(Compiler),
     _env(ci_env),
     _log(ci_env->log()),
-    _compile_id(-1),
+    _compile_id(0),
     _save_argument_registers(save_arg_registers),
     _method(NULL),
     _stub_name(stub_name),
@@ -2899,6 +2899,13 @@
       }
     }
     break;
+  case Op_MemBarStoreStore:
+    // Break the link with AllocateNode: it is no longer useful and
+    // confuses register allocation.
+    if (n->req() > MemBarNode::Precedent) {
+      n->set_req(MemBarNode::Precedent, top());
+    }
+    break;
   default:
     assert( !n->is_Call(), "" );
     assert( !n->is_Mem(), "" );
@@ -3669,3 +3676,38 @@
     n->set_req(0, NULL);
   }
 }
+
+// Auxiliary method to support randomized stressing/fuzzing.
+//
+// This method can be called the arbitrary number of times, with current count
+// as the argument. The logic allows selecting a single candidate from the
+// running list of candidates as follows:
+//    int count = 0;
+//    Cand* selected = null;
+//    while(cand = cand->next()) {
+//      if (randomized_select(++count)) {
+//        selected = cand;
+//      }
+//    }
+//
+// Including count equalizes the chances any candidate is "selected".
+// This is useful when we don't have the complete list of candidates to choose
+// from uniformly. In this case, we need to adjust the randomicity of the
+// selection, or else we will end up biasing the selection towards the latter
+// candidates.
+//
+// Quick back-envelope calculation shows that for the list of n candidates
+// the equal probability for the candidate to persist as "best" can be
+// achieved by replacing it with "next" k-th candidate with the probability
+// of 1/k. It can be easily shown that by the end of the run, the
+// probability for any candidate is converged to 1/n, thus giving the
+// uniform distribution among all the candidates.
+//
+// We don't care about the domain size as long as (RANDOMIZED_DOMAIN / count) is large.
+#define RANDOMIZED_DOMAIN_POW 29
+#define RANDOMIZED_DOMAIN (1 << RANDOMIZED_DOMAIN_POW)
+#define RANDOMIZED_DOMAIN_MASK ((1 << (RANDOMIZED_DOMAIN_POW + 1)) - 1)
+bool Compile::randomized_select(int count) {
+  assert(count > 0, "only positive");
+  return (os::random() & RANDOMIZED_DOMAIN_MASK) < (RANDOMIZED_DOMAIN / count);
+}