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When promoting the vector elements in CopyToParts, use vector trunc

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instead of scalarizing, and doing an element-by-element truncat.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133382 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2011-06-19 08:49:38 +00:00
parent c17d3552da
commit c6341e6e50
1 changed files with 3 additions and 11 deletions
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14
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -475,17 +475,9 @@ static void getCopyToPartsVector(SelectionDAG &DAG, DebugLoc DL,
PartVT.getVectorNumElements() == ValueVT.getVectorNumElements()) {
// Promoted vector extract
unsigned NumElts = ValueVT.getVectorNumElements();
SmallVector<SDValue, 8> NewOps;
for (unsigned i = 0; i < NumElts; ++i) {
SDValue Ext = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL,
ValueVT.getScalarType(), Val ,DAG.getIntPtrConstant(i));
SDValue Cast = DAG.getNode(ISD::ANY_EXTEND,
DL, PartVT.getScalarType(), Ext);
NewOps.push_back(Cast);
}
Val = DAG.getNode(ISD::BUILD_VECTOR, DL, PartVT,
&NewOps[0], NewOps.size());
bool Smaller = PartVT.bitsLE(ValueVT);
Val = DAG.getNode((Smaller ? ISD::TRUNCATE : ISD::ANY_EXTEND),
DL, PartVT, Val);
} else{
// Vector -> scalar conversion.
assert(ValueVT.getVectorNumElements() == 1 &&