diff -r 851275763963 -r 381dd5a6bae6 src/cpu/o3/rename_impl.hh
--- a/src/cpu/o3/rename_impl.hh	Mon Dec 06 15:58:54 2010 -0800
+++ b/src/cpu/o3/rename_impl.hh	Mon Dec 06 16:00:52 2010 -0800
@@ -1044,7 +1044,8 @@
         rename_result = renameMap[tid]->rename(flat_dest_reg);
 
         //Mark Scoreboard entry as not ready
-        scoreboard->unsetReg(rename_result.first);
+        if (dest_reg < TheISA::Ctrl_Base_DepTag)
+            scoreboard->unsetReg(rename_result.first);
 
         DPRINTF(Rename, "[tid:%u]: Renaming arch reg %i to physical "
                 "reg %i.\n", tid, (int)flat_dest_reg,