Teach the graph viewer to handle register operands that are zero.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24421 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
index 2c2bc21446311fa81e7fff44fa11f7dd7c587386..73535809333f47e65b06594518efaf439301512e 100644 (file)
--- a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
@@ -82,7 +82,7 @@ std::string DOTGraphTraits<SelectionDAG*>::getNodeLabel(const SDNode *Node,
       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());