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Canonicalize vvector_shuffle(x,x) -> vvector_shuffle(x,undef) to enable patterns
to match again :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27533 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2735,6 +2735,42 @@ SDOperand DAGCombiner::visitVVECTOR_SHUFFLE(SDNode *N) {
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}
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if (isIdentity) return N->getOperand(1);
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// If the LHS and the RHS are the same node, turn the RHS into an undef.
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if (N->getOperand(0) == N->getOperand(1)) {
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// Check the SHUFFLE mask, mapping any inputs from the 2nd operand into the
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// first operand.
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std::vector<SDOperand> MappedOps;
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for (unsigned i = 0; i != NumElts; ++i) {
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if (ShufMask.getOperand(i).getOpcode() == ISD::UNDEF ||
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cast<ConstantSDNode>(ShufMask.getOperand(i))->getValue() < NumElts) {
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MappedOps.push_back(ShufMask.getOperand(i));
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} else {
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unsigned NewIdx =
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cast<ConstantSDNode>(ShufMask.getOperand(i))->getValue() - NumElts;
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MappedOps.push_back(DAG.getConstant(NewIdx, MVT::i32));
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}
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}
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// Add the type/#elts values.
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MappedOps.push_back(ShufMask.getOperand(NumElts));
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MappedOps.push_back(ShufMask.getOperand(NumElts+1));
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ShufMask = DAG.getNode(ISD::VBUILD_VECTOR, ShufMask.getValueType(),
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MappedOps);
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AddToWorkList(ShufMask.Val);
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// Build the undef vector.
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SDOperand UDVal = DAG.getNode(ISD::UNDEF, MappedOps[0].getValueType());
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for (unsigned i = 0; i != NumElts; ++i)
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MappedOps[i] = UDVal;
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MappedOps[NumElts ] = *(N->getOperand(0).Val->op_end()-2);
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MappedOps[NumElts+1] = *(N->getOperand(0).Val->op_end()-1);
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UDVal = DAG.getNode(ISD::VBUILD_VECTOR, MVT::Vector, MappedOps);
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return DAG.getNode(ISD::VVECTOR_SHUFFLE, MVT::Vector,
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N->getOperand(0), UDVal, ShufMask,
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MappedOps[NumElts], MappedOps[NumElts+1]);
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}
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return SDOperand();
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}
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@ -4697,9 +4697,21 @@ SDOperand SelectionDAGLegalize::PackVectorOp(SDOperand Op,
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Result = Node->getOperand(0);
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} else {
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// Returning a BUILD_VECTOR?
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// If all elements of the build_vector are undefs, return an undef.
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bool AllUndef = true;
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for (unsigned i = 0, e = Node->getNumOperands()-2; i != e; ++i)
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if (Node->getOperand(i).getOpcode() != ISD::UNDEF) {
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AllUndef = false;
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break;
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}
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if (AllUndef) {
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Result = DAG.getNode(ISD::UNDEF, NewVT);
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} else {
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std::vector<SDOperand> Ops(Node->op_begin(), Node->op_end()-2);
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Result = DAG.getNode(ISD::BUILD_VECTOR, NewVT, Ops);
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}
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}
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break;
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case ISD::VINSERT_VECTOR_ELT:
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if (!MVT::isVector(NewVT)) {
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