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using lsx inserting

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This commit is contained in:
Qi Zhao 2025-08-21 10:48:46 +08:00
parent 6acd00f096
commit 66aae1ebd9
1 changed files with 28 additions and 4 deletions
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30
llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
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@ -2530,18 +2530,42 @@ SDValue LoongArchTargetLowering::lowerBUILD_VECTOR(SDValue Op,
if (UndefElements.count() == 0) {
unsigned SeqLen = Sequence.size();
SDValue Op0 = Sequence[0];
SDValue Vector = DAG.getUNDEF(ResTy);
SDValue FillVec = Vector;
EVT FillTy = ResTy;
// Using LSX instructions to fill the sub-sequence of 256-bits vector,
// because the high part can be simply treated as undef.
if (ResTy.is256BitVector()) {
MVT HalfEltTy;
if (ResTy.isFloatingPoint())
HalfEltTy = MVT::getFloatingPointVT(VT.getScalarSizeInBits());
else
HalfEltTy = MVT::getIntegerVT(VT.getScalarSizeInBits());
EVT HalfTy = MVT::getVectorVT(HalfEltTy, NumElts / 2);
SDValue HalfVec = DAG.getExtractSubvector(DL, HalfTy, Vector, 0);
FillVec = HalfVec;
FillTy = HalfTy;
}
SDValue Op0 = Sequence[0];
if (!Op0.isUndef())
Vector = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, ResTy, Op0);
FillVec = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, FillTy, Op0);
for (unsigned i = 1; i < SeqLen; ++i) {
SDValue Opi = Sequence[i];
if (Opi.isUndef())
continue;
Vector = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, ResTy, Vector, Opi,
FillVec =
DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, FillTy, FillVec, Opi,
DAG.getConstant(i, DL, Subtarget.getGRLenVT()));
}
if (ResTy.is256BitVector())
Vector = DAG.getInsertSubvector(DL, Vector, FillVec, 0);
else
Vector = FillVec;
unsigned SplatLen = NumElts / SeqLen;
MVT SplatEltTy = MVT::getIntegerVT(VT.getScalarSizeInBits() * SeqLen);
MVT SplatTy = MVT::getVectorVT(SplatEltTy, SplatLen);