[DAGCombiner] use root SDLoc for all nodes created by logic fold

If this is not a valid way to assign an SDLoc, then we get this
wrong all over SDAG.

I don't know enough about the SDAG to explain this. IIUC, theoretically,
debug info is not supposed to affect codegen. But here it has clearly
affected 3 different targets, and the x86 change is an actual improvement.

llvm-svn: 348552

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 70ce0a7e5e2..249cf5e9ab5 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3754,7 +3754,7 @@ SDValue DAGCombiner::hoistLogicOpWithSameOpcodeHands(SDNode *N) {
           return SDValue();
       }
       // logic_op (hand_op X), (hand_op Y) --> hand_op (logic_op X, Y)
-      SDValue Logic = DAG.getNode(LogicOpcode, SDLoc(N0), XVT, X, Y);
+      SDValue Logic = DAG.getNode(LogicOpcode, DL, XVT, X, Y);
       AddToWorklist(Logic.getNode());
       return DAG.getNode(HandOpcode, DL, VT, Logic);
   }