diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 3ce7a2a7f1b..5993daf65a0 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -92,8 +92,11 @@ operator<< (ostream& os, const MachineInstr& minstr)
 {
   os << TargetInstrDescriptors[minstr.opCode].opCodeString;
   
-  for (unsigned i=0, N=minstr.getNumOperands(); i < N; i++)
+  for (unsigned i=0, N=minstr.getNumOperands(); i < N; i++) {
     os << "\t" << minstr.getOperand(i);
+    if( minstr.getOperand(i).opIsDef() ) os << "*";
+
+  }
   
 #undef DEBUG_VAL_OP_ITERATOR
 #ifdef DEBUG_VAL_OP_ITERATOR
@@ -117,7 +120,8 @@ operator<< (ostream& os, const MachineInstr& minstr)
 
     for(unsigned z=0; z < NumOfImpRefs; z++) {
       os << minstr.getImplicitRef(z);
-	  cout << "\t";
+      if( minstr.implicitRefIsDefined(z)) os << "*";
+      cout << "\t";
     }
   }