diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index ac4eeaf0559..503b0e1b1d4 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -8612,7 +8612,9 @@ SDValue DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) { // be converted to a BUILD_VECTOR). Fill in the Ops vector with the // vector elements. SmallVector<SDValue, 8> Ops; - if (InVec.getOpcode() == ISD::BUILD_VECTOR) { + // Do not combine these two vectors if the output vector will not replace + // the input vector. + if (InVec.getOpcode() == ISD::BUILD_VECTOR && InVec.hasOneUse()) { Ops.append(InVec.getNode()->op_begin(), InVec.getNode()->op_end()); } else if (InVec.getOpcode() == ISD::UNDEF) { |
