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DAG: Use poison for some load/store offsets in legalizer #167756

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DAG: Use poison for some load/store offsets in legalizer #167756

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18 changes: 10 additions & 8 deletions llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -496,7 +496,7 @@ SDValue DAGTypeLegalizer::ScalarizeVecRes_LOAD(LoadSDNode *N) {
SDValue Result = DAG.getLoad(
ISD::UNINDEXED, N->getExtensionType(),
N->getValueType(0).getVectorElementType(), SDLoc(N), N->getChain(),
N->getBasePtr(), DAG.getUNDEF(N->getBasePtr().getValueType()),
N->getBasePtr(), DAG.getPOISON(N->getBasePtr().getValueType()),
N->getPointerInfo(), N->getMemoryVT().getVectorElementType(),
N->getBaseAlign(), N->getMemOperand()->getFlags(), N->getAAInfo());

Expand Down Expand Up @@ -2213,7 +2213,7 @@ void DAGTypeLegalizer::SplitVecRes_LOAD(LoadSDNode *LD, SDValue &Lo,
ISD::LoadExtType ExtType = LD->getExtensionType();
SDValue Ch = LD->getChain();
SDValue Ptr = LD->getBasePtr();
SDValue Offset = DAG.getUNDEF(Ptr.getValueType());
SDValue Offset = DAG.getPOISON(Ptr.getValueType());
EVT MemoryVT = LD->getMemoryVT();
MachineMemOperand::Flags MMOFlags = LD->getMemOperand()->getFlags();
AAMDNodes AAInfo = LD->getAAInfo();
Expand Down Expand Up @@ -3344,7 +3344,7 @@ void DAGTypeLegalizer::SplitVecRes_VP_REVERSE(SDNode *N, SDValue &Lo,

SDValue TrueMask = DAG.getBoolConstant(true, DL, Mask.getValueType(), VT);
SDValue Store = DAG.getStridedStoreVP(DAG.getEntryNode(), DL, Val, StorePtr,
DAG.getUNDEF(PtrVT), Stride, TrueMask,
DAG.getPOISON(PtrVT), Stride, TrueMask,
EVL, MemVT, StoreMMO, ISD::UNINDEXED);

SDValue Load = DAG.getLoadVP(VT, DL, Store, StackPtr, Mask, EVL, LoadMMO);
Expand Down Expand Up @@ -3387,14 +3387,16 @@ void DAGTypeLegalizer::SplitVecRes_VP_SPLICE(SDNode *N, SDValue &Lo,

SDValue StackPtr2 = TLI.getVectorElementPointer(DAG, StackPtr, VT, EVL1);

SDValue PoisonPtr = DAG.getPOISON(PtrVT);

SDValue TrueMask = DAG.getBoolConstant(true, DL, Mask.getValueType(), VT);
SDValue StoreV1 = DAG.getStoreVP(DAG.getEntryNode(), DL, V1, StackPtr,
DAG.getUNDEF(PtrVT), TrueMask, EVL1,
V1.getValueType(), StoreMMO, ISD::UNINDEXED);
SDValue StoreV1 =
DAG.getStoreVP(DAG.getEntryNode(), DL, V1, StackPtr, PoisonPtr, TrueMask,
EVL1, V1.getValueType(), StoreMMO, ISD::UNINDEXED);

SDValue StoreV2 =
DAG.getStoreVP(StoreV1, DL, V2, StackPtr2, DAG.getUNDEF(PtrVT), TrueMask,
EVL2, V2.getValueType(), StoreMMO, ISD::UNINDEXED);
DAG.getStoreVP(StoreV1, DL, V2, StackPtr2, PoisonPtr, TrueMask, EVL2,
V2.getValueType(), StoreMMO, ISD::UNINDEXED);

SDValue Load;
if (Imm >= 0) {
Expand Down
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