diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index dd4fda1e84..d1ef0815c8 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -5110,8 +5110,15 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) { // (vextract (scalar_to_vector val, 0) -> val SDValue InVec = N->getOperand(0); - if (InVec.getOpcode() == ISD::SCALAR_TO_VECTOR) - return InVec.getOperand(0); + if (InVec.getOpcode() == ISD::SCALAR_TO_VECTOR) { + // If the operand is wider than the vector element type then it is implicitly + // truncated. Make that explicit here. + MVT EltVT = InVec.getValueType().getVectorElementType(); + SDValue InOp = InVec.getOperand(0); + if (InOp.getValueType() != EltVT) + return DAG.getNode(ISD::TRUNCATE, InVec.getDebugLoc(), EltVT, InOp); + return InOp; + } // Perform only after legalization to ensure build_vector / vector_shuffle // optimizations have already been done. |