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Implement vector expand support for shuffle_vector. This fixes PR1811.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44242 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-11-19 21:16:54 +00:00
parent 50cdabcfd5
commit 6c9c6800b8
1 changed files with 35 additions and 0 deletions
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35
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -6286,6 +6286,41 @@ void SelectionDAGLegalize::SplitVectorOp(SDOperand Op, SDOperand &Lo,
TLI.getPointerTy()));
break;
}
case ISD::VECTOR_SHUFFLE: {
// Build the low part.
SDOperand Mask = Node->getOperand(2);
SmallVector<SDOperand, 8> Ops;
MVT::ValueType PtrVT = TLI.getPointerTy();
// Insert all of the elements from the input that are needed. We use
// buildvector of extractelement here because the input vectors will have
// to be legalized, so this makes the code simpler.
for (unsigned i = 0; i != NewNumElts_Lo; ++i) {
unsigned Idx = cast<ConstantSDNode>(Mask.getOperand(i))->getValue();
SDOperand InVec = Node->getOperand(0);
if (Idx >= NumElements) {
InVec = Node->getOperand(1);
Idx -= NumElements;
}
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, NewEltVT, InVec,
DAG.getConstant(Idx, PtrVT)));
}
Lo = DAG.getNode(ISD::BUILD_VECTOR, NewVT_Lo, &Ops[0], Ops.size());
Ops.clear();
for (unsigned i = NewNumElts_Lo; i != NumElements; ++i) {
unsigned Idx = cast<ConstantSDNode>(Mask.getOperand(i))->getValue();
SDOperand InVec = Node->getOperand(0);
if (Idx >= NumElements) {
InVec = Node->getOperand(1);
Idx -= NumElements;
}
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, NewEltVT, InVec,
DAG.getConstant(Idx, PtrVT)));
}
Hi = DAG.getNode(ISD::BUILD_VECTOR, NewVT_Lo, &Ops[0], Ops.size());
break;
}
case ISD::BUILD_VECTOR: {
SmallVector<SDOperand, 8> LoOps(Node->op_begin(),
Node->op_begin()+NewNumElts_Lo);