diff -r 8b0a4867acf0 -r 5e990493719e src/share/vm/opto/split_if.cpp
--- a/src/share/vm/opto/split_if.cpp	Tue Jun 12 14:31:44 2012 -0700
+++ b/src/share/vm/opto/split_if.cpp	Tue Jun 12 16:23:31 2012 -0700
@@ -137,9 +137,7 @@
             Node *iff_ctrl = iff->is_If() ? iff->in(0) : get_ctrl(iff);
             Node *x = bol->clone();
             register_new_node(x, iff_ctrl);
-            _igvn.hash_delete(iff);
-            iff->set_req(1, x);
-            _igvn._worklist.push(iff);
+            _igvn.replace_input_of(iff, 1, x);
           }
           _igvn.remove_dead_node( bol );
           --i;
@@ -151,9 +149,7 @@
         assert( bol->in(1) == n, "" );
         Node *x = n->clone();
         register_new_node(x, get_ctrl(bol));
-        _igvn.hash_delete(bol);
-        bol->set_req(1, x);
-        _igvn._worklist.push(bol);
+        _igvn.replace_input_of(bol, 1, x);
       }
       _igvn.remove_dead_node( n );
 
@@ -387,9 +383,7 @@
     if( use->in(i) == def )
       break;
   assert( i < use->req(), "def should be among use's inputs" );
-  _igvn.hash_delete(use);
-  use->set_req(i, new_def);
-  _igvn._worklist.push(use);
+  _igvn.replace_input_of(use, i, new_def);
 }
 
 //------------------------------do_split_if------------------------------------