diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
index 2c2bc21..7353580 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
@@ -82,7 +82,7 @@
       Op += LBB->getName();
     //Op += " " + (const void*)BBDN->getBasicBlock();
   } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(Node)) {
-    if (G && MRegisterInfo::isPhysicalRegister(R->getReg())) {
+    if (G && R->getReg() != 0 && MRegisterInfo::isPhysicalRegister(R->getReg())) {
       Op = Op + " " + G->getTarget().getRegisterInfo()->getName(R->getReg());
     } else {
       Op += " #" + utostr(R->getReg());