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Rejected 169195. As Duncan commented, bitcasting to proper type is wrong approach. We need to insert some valid TRANCATE node here.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stepan Dyatkovskiy
2012-08-22 09:33:55 +00:00
parent 96601ca332
commit fdeb9fe5e0
2 changed files with 3 additions and 33 deletions
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26
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -7876,29 +7876,9 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
if (VecIn1.getValueType().getSizeInBits()*2 != VT.getSizeInBits())
return SDValue();
// If the element type of the input vector is not the same as
// the output element type, make concat_vectors based on input element
// type and then bitcast it to the output vector type.
//
// In another words avoid nodes like this:
// <NODE> v16i8 = concat_vectors v4i16 v4i16
// Replace it with this one:
// <NODE0> v8i16 = concat_vectors v4i16 v4i16
// <NODE1> v16i8 = bitcast NODE0
EVT ItemType = VecIn1.getValueType().getVectorElementType();
if (ItemType != VT.getVectorElementType()) {
EVT ConcatVT = EVT::getVectorVT(*DAG.getContext(),
ItemType,
VecIn1.getValueType().getVectorNumElements()*2);
// Widen the input vector by adding undef values.
VecIn1 = DAG.getNode(ISD::CONCAT_VECTORS, dl, ConcatVT,
VecIn1, DAG.getUNDEF(VecIn1.getValueType()));
VecIn1 = DAG.getNode(ISD::BITCAST, dl, VT, VecIn1);
} else
// Widen the input vector by adding undef values.
VecIn1 = DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
VecIn1, DAG.getUNDEF(VecIn1.getValueType()));
// Widen the input vector by adding undef values.
VecIn1 = DAG.getNode(ISD::CONCAT_VECTORS, N->getDebugLoc(), VT,
VecIn1, DAG.getUNDEF(VecIn1.getValueType()));
}
// If VecIn2 is unused then change it to undef.