diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 4e29879..1c485a0 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -7876,9 +7876,29 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) { if (VecIn1.getValueType().getSizeInBits()*2 != VT.getSizeInBits()) return SDValue(); - // Widen the input vector by adding undef values. - VecIn1 = DAG.getNode(ISD::CONCAT_VECTORS, N->getDebugLoc(), VT, - VecIn1, DAG.getUNDEF(VecIn1.getValueType())); + // If the element type of the input vector is not the same as + // the output element type, make concat_vectors based on input element + // type and then bitcast it to the output vector type. + // + // In another words avoid nodes like this: + // <NODE> v16i8 = concat_vectors v4i16 v4i16 + // Replace it with this one: + // <NODE0> v8i16 = concat_vectors v4i16 v4i16 + // <NODE1> v16i8 = bitcast NODE0 + EVT ItemType = VecIn1.getValueType().getVectorElementType(); + if (ItemType != VT.getVectorElementType()) { + EVT ConcatVT = EVT::getVectorVT(*DAG.getContext(), + ItemType, + VecIn1.getValueType().getVectorNumElements()*2); + // Widen the input vector by adding undef values. + VecIn1 = DAG.getNode(ISD::CONCAT_VECTORS, dl, ConcatVT, + VecIn1, DAG.getUNDEF(VecIn1.getValueType())); + VecIn1 = DAG.getNode(ISD::BITCAST, dl, VT, VecIn1); + } else + // Widen the input vector by adding undef values. + VecIn1 = DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, + VecIn1, DAG.getUNDEF(VecIn1.getValueType())); + } // If VecIn2 is unused then change it to undef. |