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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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16
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@@ -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: