[llvm-branch-commits] [llvm] [SelectionDAG][X86] Widen <2 x T> vector types for atomic load (PR #120598)

[via llvm-branch-commits]

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@@ -5907,6 +5910,30 @@ SDValue DAGTypeLegalizer::WidenVecRes_INSERT_VECTOR_ELT(SDNode *N) {
                      N->getOperand(1), N->getOperand(2));
 }
 
+SDValue DAGTypeLegalizer::WidenVecRes_ATOMIC_LOAD(AtomicSDNode *N) {
+  SmallVector<SDValue, 16> LdChain; // Chain for the series of load
+  SDValue Result = GenWidenVectorLoads(LdChain, N, /*IsAtomic=*/true);
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jofrn wrote:

Within GenWidenVectorLoads, MemVTs should be empty and so we will generate a single atomic anyway. I've added a check `IsAtomic` to ensure we go down this path.

https://github.com/llvm/llvm-project/pull/120598