Assign node order numbers to results of call instruction lowering. This should improve src line debug info when sdisel is used. rdar://9199118

llvm-svn: 128728

1 files changed, 8 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 18d5a7a9ee4..94923530895 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4927,15 +4927,19 @@ void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee,
              DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(),
                          DAG.getVTList(&RetTys[0], RetTys.size()),
                          &ReturnValues[0], ReturnValues.size()));
-
   }
 
   // As a special case, a null chain means that a tail call has been emitted and
   // the DAG root is already updated.
-  if (Result.second.getNode())
-    DAG.setRoot(Result.second);
-  else
+  if (!Result.second.getNode()) {
     HasTailCall = true;
+    ++SDNodeOrder;
+    AssignOrderingToNode(DAG.getRoot().getNode());
+  } else {
+    DAG.setRoot(Result.second);
+    ++SDNodeOrder;
+    AssignOrderingToNode(Result.second.getNode());
+  }
 
   if (LandingPad) {
     // Insert a label at the end of the invoke call to mark the try range.  This