[CK_TILE] Multiple-D GEMM example (#2219)

* Multiple d, initial commit

* Check Ds Layout

* Readme and clang format

* Update branch & conflicts

* Multiple D - fix clang-formatter

* Rename elemetwise_op

* Fix CI

* Code review part1

* Remove printf

* Remove unnecessary comment

* Add new tests with Col layout

* Review part 2

* Added support for Multiple D GEMM

* Update comment

* Remove maybe_unused

* Clang-format

* Review part 3

* Add comment to function

* Add comment to function: another

* Take number of params for a refrence function

* Remove additional d param for 0 tensor

* Change name of function

* Fix CI fails

example/ck_tile/19_gemm_multi_d/utils.hpp

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+struct MultiplyMultiply
+{
+    template <typename E, typename C, typename D0, typename D1>
+    CK_TILE_HOST_DEVICE auto operator()(E& e, const C& c, const D0& d0, const D1& d1) const -> void
+    {
+        const float x0_f = ck_tile::type_convert<float>(c) * ck_tile::type_convert<float>(d0) *
+                           ck_tile::type_convert<float>(d1);
+
+        e = ck_tile::type_convert<E>(x0_f);
+    }
+};
+
+template <typename Layout>
+static constexpr inline auto is_row_major(Layout layout_)
+{
+    return ck_tile::bool_constant<std::is_same_v<ck_tile::remove_cvref_t<decltype(layout_)>,
+                                                 ck_tile::tensor_layout::gemm::RowMajor>>{};
+}
+
+auto calculate_rtol_atol(const ck_tile::index_t K,
+                         const ck_tile::index_t kbatch,
+                         const float max_accumulated_value)
+{
+    using ComputeTypeAB =
+        std::conditional_t<sizeof(ADataType) < sizeof(BDataType), ADataType, BDataType>;
+
+    using ComputeType =
+        std::conditional_t<sizeof(ComputeTypeAB) < sizeof(D0DataType), ComputeTypeAB, D0DataType>;
+    // Calculate thresholds
+    const auto rtol = ck_tile::get_relative_threshold<ComputeType, EDataType, AccDataType>(
+        ck_tile::integer_divide_ceil(K, kbatch));
+
+    const auto atol = ck_tile::get_absolute_threshold<ComputeType, EDataType, AccDataType>(
+        max_accumulated_value / kbatch, ck_tile::integer_divide_ceil(K, kbatch));
+
+    // Calculate error due to split_k accumulation
+    const auto rtol_split_k =
+        ck_tile::get_relative_threshold<EDataType, EDataType, EDataType>(kbatch);
+
+    const auto atol_split_k = ck_tile::get_absolute_threshold<EDataType, EDataType, EDataType>(
+        max_accumulated_value, kbatch);
+
+    // Use higher threshold
+    return ck_tile::make_tuple(std::max(rtol, rtol_split_k), std::max(atol, atol_split_k));
+}