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Canonicalize vvector_shuffle(x,x) -> vvector_shuffle(x,undef) to enable patterns

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to match again :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27533 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-04-08 05:34:25 +00:00
parent 42b5580b97
commit 17614ea63d
2 changed files with 50 additions and 2 deletions
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36
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -2735,6 +2735,42 @@ SDOperand DAGCombiner::visitVVECTOR_SHUFFLE(SDNode *N) {
}
if (isIdentity) return N->getOperand(1);
// If the LHS and the RHS are the same node, turn the RHS into an undef.
if (N->getOperand(0) == N->getOperand(1)) {
// Check the SHUFFLE mask, mapping any inputs from the 2nd operand into the
// first operand.
std::vector<SDOperand> MappedOps;
for (unsigned i = 0; i != NumElts; ++i) {
if (ShufMask.getOperand(i).getOpcode() == ISD::UNDEF ||
cast<ConstantSDNode>(ShufMask.getOperand(i))->getValue() < NumElts) {
MappedOps.push_back(ShufMask.getOperand(i));
} else {
unsigned NewIdx =
cast<ConstantSDNode>(ShufMask.getOperand(i))->getValue() - NumElts;
MappedOps.push_back(DAG.getConstant(NewIdx, MVT::i32));
}
}
// Add the type/#elts values.
MappedOps.push_back(ShufMask.getOperand(NumElts));
MappedOps.push_back(ShufMask.getOperand(NumElts+1));
ShufMask = DAG.getNode(ISD::VBUILD_VECTOR, ShufMask.getValueType(),
MappedOps);
AddToWorkList(ShufMask.Val);
// Build the undef vector.
SDOperand UDVal = DAG.getNode(ISD::UNDEF, MappedOps[0].getValueType());
for (unsigned i = 0; i != NumElts; ++i)
MappedOps[i] = UDVal;
MappedOps[NumElts ] = *(N->getOperand(0).Val->op_end()-2);
MappedOps[NumElts+1] = *(N->getOperand(0).Val->op_end()-1);
UDVal = DAG.getNode(ISD::VBUILD_VECTOR, MVT::Vector, MappedOps);
return DAG.getNode(ISD::VVECTOR_SHUFFLE, MVT::Vector,
N->getOperand(0), UDVal, ShufMask,
MappedOps[NumElts], MappedOps[NumElts+1]);
}
return SDOperand();
}

16
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
View File

@ -4697,8 +4697,20 @@ SDOperand SelectionDAGLegalize::PackVectorOp(SDOperand Op,
Result = Node->getOperand(0);
} else {
// Returning a BUILD_VECTOR?
std::vector<SDOperand> Ops(Node->op_begin(), Node->op_end()-2);
Result = DAG.getNode(ISD::BUILD_VECTOR, NewVT, Ops);
// If all elements of the build_vector are undefs, return an undef.
bool AllUndef = true;
for (unsigned i = 0, e = Node->getNumOperands()-2; i != e; ++i)
if (Node->getOperand(i).getOpcode() != ISD::UNDEF) {
AllUndef = false;
break;
}
if (AllUndef) {
Result = DAG.getNode(ISD::UNDEF, NewVT);
} else {
std::vector<SDOperand> Ops(Node->op_begin(), Node->op_end()-2);
Result = DAG.getNode(ISD::BUILD_VECTOR, NewVT, Ops);
}
}
break;
case ISD::VINSERT_VECTOR_ELT: