diff options
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index a559d3e469..4d1e39359b 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2261,6 +2261,11 @@ SDOperand DAGCombiner::visitLOAD(SDNode *N) { SDOperand Chain = N->getOperand(0); SDOperand Ptr = N->getOperand(1); SDOperand SrcValue = N->getOperand(2); + + // If there are no uses of the loaded value, change uses of the chain value + // into uses of the chain input (i.e. delete the dead load). + if (N->hasNUsesOfValue(0, 0)) + return CombineTo(N, DAG.getNode(ISD::UNDEF, N->getValueType(0)), Chain); // If this load is directly stored, replace the load value with the stored // value. |