From 8b1bca199897a6e3b7b849b5fa69e07b110c9ce0 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Fri, 1 Apr 2011 19:57:01 +0000 Subject: Add comments. llvm-svn: 128730 --- llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp') diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp index 9492353..6785d69 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ b/llvm/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()); -- cgit v1.1