diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 0758a31ec99..366b404b304 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -5367,6 +5367,9 @@ SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT, break; } case ISD::INSERT_SUBVECTOR: { + // Inserting undef into undef is still undef. + if (N1.isUndef() && N2.isUndef()) + return getUNDEF(VT); SDValue Index = N3; if (VT.isSimple() && N1.getValueType().isSimple() && N2.getValueType().isSimple()) { |
