diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 5fe10039207..2f026018fa3 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -187,7 +187,11 @@ void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
       else
         OS << "%mreg" << getReg();
     }
-      
+
+    if (getSubReg() != 0) {
+      OS << ":" << getSubReg();
+    }
+
     if (isDef() || isKill() || isDead() || isImplicit() || isEarlyClobber()) {
       OS << "<";
       bool NeedComma = false;