From c249e4855883d7b799db61edc839cbfaff50ae81 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Fri, 1 Apr 2011 19:57:01 +0000 Subject: [PATCH] Add comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128730 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp index 94923530895..6785d6943e1 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -4929,9 +4929,11 @@ void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee, &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. + // Assign order to nodes here. If the call does not produce a result, it won't + // be mapped to a SDNode and visit() will not assign it an order number. if (!Result.second.getNode()) { + // As a special case, a null chain means that a tail call has been emitted and + // the DAG root is already updated. HasTailCall = true; ++SDNodeOrder; AssignOrderingToNode(DAG.getRoot().getNode());