[mlir][sparse] add test that combines sparse codegen and lowering to llvm struct

Reviewed By: bixia

Differential Revision: https://reviews.llvm.org/D141006

Author: aartbik

mlir/test/Dialect/SparseTensor/codegen_to_llvm.mlir

@@ -0,0 +1,14 @@
+// RUN: mlir-opt %s --sparse-tensor-codegen --sparse-storage-specifier-to-llvm | FileCheck %s
+
+#SparseVector = #sparse_tensor.encoding<{ dimLevelType = ["compressed"] }>
+
+// CHECK-LABEL: func @sparse_nop(
+//  CHECK-SAME: %[[A0:.*0]]: memref<?xindex>,
+//  CHECK-SAME: %[[A1:.*1]]: memref<?xindex>,
+//  CHECK-SAME: %[[A2:.*2]]: memref<?xf64>,
+//  CHECK-SAME: %[[A3:.*3]]: !llvm.struct<(array<1 x i64>, array<3 x i64>)>)
+//       CHECK: return %[[A0]], %[[A1]], %[[A2]], %[[A3]] :
+//  CHECK-SAME: memref<?xindex>, memref<?xindex>, memref<?xf64>, !llvm.struct<(array<1 x i64>, array<3 x i64>)>
+func.func @sparse_nop(%arg0: tensor<?xf64, #SparseVector>) -> tensor<?xf64, #SparseVector> {
+  return %arg0 : tensor<?xf64, #SparseVector>
+}