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[DAGCombine] Cleanup visitEXTRACT_SUBVECTOR. NFCI. 

Use ArrayRef::slice, reduce some rather awkward long lines for legibility and run clang-format.

llvm-svn: 359326
This commit is contained in:
Simon Pilgrim 2019-04-26 17:49:02 +00:00
parent aebd3014a5
commit ef54b1dddf
1 changed files with 11 additions and 10 deletions
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21
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -17531,7 +17531,7 @@ static SDValue narrowExtractedVectorLoad(SDNode *Extract, SelectionDAG &DAG) {
return NewLd;
}
SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode* N) {
SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode *N) {
EVT NVT = N->getValueType(0);
SDValue V = N->getOperand(0);
@ -17584,26 +17584,27 @@ SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode* N) {
if (ExtractSize % EltSize == 0) {
unsigned NumElems = ExtractSize / EltSize;
EVT EltVT = InVT.getVectorElementType();
EVT ExtractVT = NumElems == 1 ? EltVT :
EVT::getVectorVT(*DAG.getContext(), EltVT, NumElems);
EVT ExtractVT = NumElems == 1 ? EltVT
: EVT::getVectorVT(*DAG.getContext(),
EltVT, NumElems);
if ((Level < AfterLegalizeDAG ||
(NumElems == 1 ||
TLI.isOperationLegal(ISD::BUILD_VECTOR, ExtractVT))) &&
(!LegalTypes || TLI.isTypeLegal(ExtractVT))) {
unsigned IdxVal = (Idx->getZExtValue() * NVT.getScalarSizeInBits()) /
EltSize;
unsigned IdxVal = Idx->getZExtValue();
IdxVal *= NVT.getScalarSizeInBits();
IdxVal /= EltSize;
if (NumElems == 1) {
SDValue Src = V->getOperand(IdxVal);
if (EltVT != Src.getValueType())
Src = DAG.getNode(ISD::TRUNCATE, SDLoc(N), InVT, Src);
return DAG.getBitcast(NVT, Src);
}
// Extract the pieces from the original build_vector.
SDValue BuildVec = DAG.getBuildVector(ExtractVT, SDLoc(N),
makeArrayRef(V->op_begin() + IdxVal,
NumElems));
SDValue BuildVec = DAG.getBuildVector(
ExtractVT, SDLoc(N), V->ops().slice(IdxVal, NumElems));
return DAG.getBitcast(NVT, BuildVec);
}
}
@ -17633,7 +17634,7 @@ SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode* N) {
return DAG.getNode(
ISD::EXTRACT_SUBVECTOR, SDLoc(N), NVT,
DAG.getBitcast(N->getOperand(0).getValueType(), V.getOperand(0)),
N->getOperand(1));
N->getOperand(1));
}
}