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[X86] combineLoad - begun making the load split code more generic. NFCI.

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This is currently only used for ymm->xmm splitting but we shouldn't hardcode the offsets/alignment.

This is necessary for an upcoming patch to split under-aligned non-temporal vector loads.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363570 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Pilgrim 2019-06-17 15:54:36 +00:00
parent bdd7b78551
commit 3ea8c2ac6a
1 changed files with 12 additions and 13 deletions
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25
lib/Target/X86/X86ISelLowering.cpp
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@ -39111,27 +39111,26 @@ static SDValue combineLoad(SDNode *N, SelectionDAG &DAG,
Ext == ISD::NON_EXTLOAD &&
((Ld->isNonTemporal() && !Subtarget.hasInt256() && Alignment >= 16) ||
(TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), RegVT,
*Ld->getMemOperand(), &Fast) && !Fast))) {
*Ld->getMemOperand(), &Fast) &&
!Fast))) {
unsigned NumElems = RegVT.getVectorNumElements();
if (NumElems < 2)
return SDValue();
SDValue Ptr = Ld->getBasePtr();
unsigned HalfAlign = 16;
SDValue Ptr1 = Ld->getBasePtr();
SDValue Ptr2 = DAG.getMemBasePlusOffset(Ptr1, HalfAlign, dl);
EVT HalfVT = EVT::getVectorVT(*DAG.getContext(), MemVT.getScalarType(),
NumElems/2);
NumElems / 2);
SDValue Load1 =
DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr, Ld->getPointerInfo(),
DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr1, Ld->getPointerInfo(),
Alignment, Ld->getMemOperand()->getFlags());
Ptr = DAG.getMemBasePlusOffset(Ptr, 16, dl);
SDValue Load2 =
DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr,
Ld->getPointerInfo().getWithOffset(16),
MinAlign(Alignment, 16U), Ld->getMemOperand()->getFlags());
SDValue Load2 = DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr2,
Ld->getPointerInfo().getWithOffset(HalfAlign),
MinAlign(Alignment, HalfAlign),
Ld->getMemOperand()->getFlags());
SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
Load1.getValue(1),
Load2.getValue(1));
Load1.getValue(1), Load2.getValue(1));
SDValue NewVec = DAG.getNode(ISD::CONCAT_VECTORS, dl, RegVT, Load1, Load2);
return DCI.CombineTo(N, NewVec, TF, true);