[llvm-branch-commits] [OpenMP][MLIR] Extend record member map support for omp dialect to LLVM-IR (PR #82852)

[Sergio Afonso via llvm-branch-commits]

================
@@ -2122,6 +2124,66 @@ void collectMapDataFromMapOperands(MapInfoData &mapData,
   }
 }
 
+static int getMapDataMemberIdx(MapInfoData &mapData,
+                               mlir::omp::MapInfoOp memberOp) {
+  auto *res = llvm::find(mapData.MapClause, memberOp);
+  assert(res != mapData.MapClause.end() &&
+         "MapInfoOp for member not found in MapData, cannot return index");
+  return std::distance(mapData.MapClause.begin(), res);
+}
+
+static mlir::omp::MapInfoOp
+getFirstOrLastMappedMemberPtr(mlir::omp::MapInfoOp mapInfo, bool first) {
+  mlir::DenseIntElementsAttr indexAttr = mapInfo.getMembersIndexAttr();
+
+  // Only 1 member has been mapped, we can return it.
+  if (indexAttr.size() == 1)
+    if (auto mapOp = mlir::dyn_cast<mlir::omp::MapInfoOp>(
+            mapInfo.getMembers()[0].getDefiningOp()))
+      return mapOp;
+
+  llvm::ArrayRef<int64_t> shape = indexAttr.getShapedType().getShape();
+  std::vector<size_t> indices(shape[0]);
+  std::iota(indices.begin(), indices.end(), 0);
+
+  llvm::sort(
+      indices.begin(), indices.end(), [&](const size_t a, const size_t b) {
+        for (int i = 0;
+             i < shape[1];
+             ++i) {
+          int aIndex = indexAttr.getValues<int32_t>()[a * shape[1] + i];
+          int bIndex = indexAttr.getValues<int32_t>()[b * shape[1] + i];
----------------
skatrak wrote:

Nit: Extract `indexAttr.getValues<int32_t>()` out of the lambda.
```suggestion
          int aIndex = indexAttrValues[a * shape[1] + i];
          int bIndex = indexAttrValues[b * shape[1] + i];
```

https://github.com/llvm/llvm-project/pull/82852