diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index d56e737226e..793352c16d3 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -16756,6 +16756,11 @@ SDValue DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) { EVT VT = InVec.getValueType(); unsigned NumElts = VT.getVectorNumElements(); + // Insert into out-of-bounds element is undefined. + if (auto *IndexC = dyn_cast<ConstantSDNode>(EltNo)) + if (IndexC->getZExtValue() >= VT.getVectorNumElements()) + return DAG.getUNDEF(VT); + // Remove redundant insertions: // (insert_vector_elt x (extract_vector_elt x idx) idx) -> x if (InVal.getOpcode() == ISD::EXTRACT_VECTOR_ELT && |
