diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index d58a0fb..ef2fcee 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1162,6 +1162,13 @@
 
     if (FirstOp) FirstOp = false; else OS << ",";
     OS << " ";
+    if (i < getDesc().NumOperands) {
+      const TargetOperandInfo &TOI = getDesc().OpInfo[i];
+      if (TOI.isPredicate())
+        OS << "pred:";
+      if (TOI.isOptionalDef())
+        OS << "opt:";
+    }
     MO.print(OS, TM);
   }