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Exapnd a VECTOR_SHUFFLE to a BUILD_VECTOR if target asks for it to be expanded

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or custom lowering fails.

llvm-svn: 27432
This commit is contained in:
Evan Cheng 2006-04-05 06:07:11 +00:00
parent 9455fcb13d
commit abd8dc54c2
1 changed files with 30 additions and 2 deletions
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32
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -933,9 +933,37 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
"vector shuffle should not be created if not legal!");
break;
case TargetLowering::Custom:
Tmp1 = TLI.LowerOperation(Result, DAG);
if (Tmp1.Val) Result = Tmp1;
Tmp3 = TLI.LowerOperation(Result, DAG);
if (Tmp3.Val) {
Result = Tmp3;
break;
}
// FALLTHROUGH
case TargetLowering::Expand: {
MVT::ValueType VT = Node->getValueType(0);
MVT::ValueType EltVT = MVT::getVectorBaseType(VT);
MVT::ValueType PtrVT = TLI.getPointerTy();
SDOperand Mask = Node->getOperand(2);
unsigned NumElems = Mask.getNumOperands();
std::vector<SDOperand> Ops;
for (unsigned i = 0; i != NumElems; ++i) {
SDOperand Arg = Mask.getOperand(i);
if (Arg.getOpcode() == ISD::UNDEF) {
Ops.push_back(DAG.getNode(ISD::UNDEF, EltVT));
} else {
assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!");
unsigned Idx = cast<ConstantSDNode>(Arg)->getValue();
if (Idx < NumElems)
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Tmp1,
DAG.getConstant(Idx, PtrVT)));
else
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Tmp2,
DAG.getConstant(Idx - NumElems, PtrVT)));
}
}
Result = DAG.getNode(ISD::BUILD_VECTOR, VT, Ops);
break;
}
case TargetLowering::Promote: {
// Change base type to a different vector type.
MVT::ValueType OVT = Node->getValueType(0);