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Exapnd a VECTOR_SHUFFLE to a BUILD_VECTOR if target asks for it to be expanded
or custom lowering fails. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27432 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -933,9 +933,37 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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"vector shuffle should not be created if not legal!");
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break;
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case TargetLowering::Custom:
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Tmp1 = TLI.LowerOperation(Result, DAG);
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if (Tmp1.Val) Result = Tmp1;
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Tmp3 = TLI.LowerOperation(Result, DAG);
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if (Tmp3.Val) {
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Result = Tmp3;
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break;
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}
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// FALLTHROUGH
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case TargetLowering::Expand: {
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MVT::ValueType VT = Node->getValueType(0);
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MVT::ValueType EltVT = MVT::getVectorBaseType(VT);
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MVT::ValueType PtrVT = TLI.getPointerTy();
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SDOperand Mask = Node->getOperand(2);
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unsigned NumElems = Mask.getNumOperands();
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std::vector<SDOperand> Ops;
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for (unsigned i = 0; i != NumElems; ++i) {
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SDOperand Arg = Mask.getOperand(i);
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if (Arg.getOpcode() == ISD::UNDEF) {
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Ops.push_back(DAG.getNode(ISD::UNDEF, EltVT));
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} else {
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assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!");
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unsigned Idx = cast<ConstantSDNode>(Arg)->getValue();
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if (Idx < NumElems)
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Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Tmp1,
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DAG.getConstant(Idx, PtrVT)));
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else
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Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Tmp2,
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DAG.getConstant(Idx - NumElems, PtrVT)));
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}
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}
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Result = DAG.getNode(ISD::BUILD_VECTOR, VT, Ops);
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break;
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}
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case TargetLowering::Promote: {
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// Change base type to a different vector type.
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MVT::ValueType OVT = Node->getValueType(0);
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