[Mlir-commits] [mlir] [mlir] Add inferContractionDims util for indexing map inputs (PR #76081)

[lorenzo chelini]

================
@@ -201,11 +202,47 @@ findPermutationsIndexingOperand(LinalgOp linalgOp, OpOperand *opOperand,
   return res;
 }
 
+static llvm::SmallDenseSet<int64_t>
+findPermutationsIndexingOperand(LinalgOp linalgOp, OpOperand *opOperand,
+                                utils::IteratorType iter) {
+  assert(linalgOp == opOperand->getOwner() && "expected linalgOp owner");
+  return findPermutationsIndexingOperandImpl(
+      linalgOp.getMatchingIndexingMap(opOperand),
+      linalgOp.getIteratorTypesArray(), iter);
+}
+
+static llvm::SmallDenseSet<int64_t>
+findPermutationsIndexingOperand(AffineMap indexingMap,
+                                ArrayRef<utils::IteratorType> iterators,
+                                utils::IteratorType iter) {
+  assert(iterators.size() == indexingMap.getNumDims());
+  return findPermutationsIndexingOperandImpl(indexingMap, iterators, iter);
+}
+
 namespace {
 auto par = utils::IteratorType::parallel;
 auto red = utils::IteratorType::reduction;
 } // namespace
 
+/// Infer the iterator types from the init affine map. This looks at which dims
+/// are present in the map results, and returns an iterator types array with
+/// parallel types for dims that are present, and reduction types for dims that
+/// are not present.
+static FailureOr<ArrayRef<utils::IteratorType>>
----------------
chelini wrote:

Is this method correct? ArrayRef does not own the underlying data and you return the small vector allocated in the function.

https://github.com/llvm/llvm-project/pull/76081