[llvm] [mlir] [llvm][OpenMP] Handle complex types in atomic read (PR #111377)

[via llvm-commits]

================
@@ -7832,6 +7832,18 @@ OpenMPIRBuilder::createAtomicRead(const LocationDescription &Loc,
         Builder.CreateLoad(XElemTy, X.Var, X.IsVolatile, "omp.atomic.read");
     XLD->setAtomic(AO);
     XRead = cast<Value>(XLD);
+  } else if (XElemTy->isStructTy()) {
+    LoadInst *OldVal = Builder.CreateLoad(XElemTy, X.Var, "omp.atomic.read");
+    OldVal->setAtomic(AO);
+    const DataLayout &LoadDL = OldVal->getModule()->getDataLayout();
+    unsigned LoadSize =
+        LoadDL.getTypeStoreSize(OldVal->getPointerOperand()->getType());
+    OpenMPIRBuilder::AtomicInfo atomicInfo(
+        &Builder, XElemTy, LoadSize * 8, LoadSize * 8, OldVal->getAlign(),
+        OldVal->getAlign(), true /* UseLibcall */, X.Var);
+    auto AtomicLoadRes = atomicInfo.EmitAtomicLoadLibcall(AO);
----------------
NimishMishra wrote:

@Meinersbur I have added a FIXME for this point. Thanks. If everything else looks okay, can we merge this?

https://github.com/llvm/llvm-project/pull/111377