[llvm-branch-commits] [llvm] [SelectionDAG] Split vector types for atomic load (PR #120640)

[Matt Arsenault via llvm-branch-commits]

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@@ -1421,6 +1424,40 @@ void DAGTypeLegalizer::SplitVectorResult(SDNode *N, unsigned ResNo) {
     SetSplitVector(SDValue(N, ResNo), Lo, Hi);
 }
 
+void DAGTypeLegalizer::SplitVecRes_ATOMIC_LOAD(AtomicSDNode *LD, SDValue &Lo,
+                                               SDValue &Hi) {
+  EVT LoVT, HiVT;
+  SDLoc dl(LD);
+  std::tie(LoVT, HiVT) = DAG.GetSplitDestVTs(LD->getValueType(0));
+
+  ISD::LoadExtType ExtType = LD->getExtensionType();
+  SDValue Ch = LD->getChain();
+  SDValue Ptr = LD->getBasePtr();
+  EVT MemoryVT = LD->getMemoryVT();
+
+  EVT LoMemVT, HiMemVT;
+  std::tie(LoMemVT, HiMemVT) = DAG.GetSplitDestVTs(MemoryVT);
+
+  EVT IntVT = EVT::getIntegerVT(*DAG.getContext(), LD->getValueType(0).getSizeInBits());
+  EVT MemIntVT = EVT::getIntegerVT(*DAG.getContext(), LD->getMemoryVT().getSizeInBits());
+  SDValue ALD = DAG.getAtomicLoad(ExtType, dl, MemIntVT, IntVT, Ch, Ptr,
+                                  LD->getMemOperand());
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arsenm wrote:

Maybe the right thing to do is just create a non-extending load of the bitcast in-memory type

https://github.com/llvm/llvm-project/pull/120640