1 files changed, 123 insertions, 0 deletions
diff --git a/src/cpu/kernels/depth_to_space/nchw/any/impl.cpp b/src/cpu/kernels/depth_to_space/nchw/any/impl.cpp
new file mode 100644
index 0000000000..0277690112
--- /dev/null
+++ b/src/cpu/kernels/depth_to_space/nchw/any/impl.cpp
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2023 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "arm_compute/core/Error.h"
+
+#include <cstdint>
+#include <cstring>
+
+namespace arm_compute
+{
+namespace cpu
+{
+
+void depth_to_space_nchw_any( //
+    const uint8_t  *src,
+    uint8_t        *dst,
+    const uintptr_t src_shape[4],
+    const uintptr_t src_strides[4],
+    const uintptr_t dst_strides[4],
+    uintptr_t       element_size,
+    uintptr_t       block_size)
+{
+    ARM_COMPUTE_ERROR_ON(src_strides[0] != element_size);
+    ARM_COMPUTE_ERROR_ON(dst_strides[0] != element_size);
+
+    const auto dst_channels         = src_shape[2] / (block_size * block_size);
+    const auto src_block_col_stride = dst_channels * src_strides[2];
+    const auto src_block_row_stride = block_size * dst_channels * src_strides[2];
+
+    auto *src_batch_ptr = src;
+    auto *dst_batch_ptr = dst;
+
+    for (uintptr_t batch = 0; batch < src_shape[3]; ++batch)
+    {
+        auto *src_channel_ptr = src_batch_ptr;
+        auto *dst_channel_ptr = dst_batch_ptr;
+
+        for (uintptr_t channel = 0; channel < dst_channels; ++channel)
+        {
+            auto *src_height_block_ptr = src_channel_ptr;
+            auto *dst_row_ptr          = dst_channel_ptr;
+
+            for (uintptr_t height_block = 0; height_block < src_shape[1]; ++height_block)
+            {
+                auto *src_block_row_ptr = src_height_block_ptr;
+
+                for (uintptr_t block_row = 0; block_row < block_size; ++block_row)
+                {
+                    auto *src_width_block_ptr = src_block_row_ptr;
+                    auto *dst_col_ptr         = dst_row_ptr;
+
+                    for (uintptr_t width_block = 0; width_block < src_shape[0]; ++width_block)
+                    {
+                        auto *src_block_col_ptr = src_width_block_ptr;
+
+                        for (uintptr_t block_col = 0; block_col < block_size; ++block_col)
+                        {
+                            // The source pointer is accumulated as:
+                            //
+                            // src_block_col_ptr =
+                            //   src +
+                            //   batch * dst_strides[3] +
+                            //   (channel + (block_row * block_size + block_col) * dst_channels) * src_strides[2] +
+                            //   height_block * src_strides[1] +
+                            //   width_block * element_size;
+                            //
+                            // The destination pointer is accumuated as:
+                            //
+                            // dst_col_ptr =
+                            //   dst +
+                            //   batch * dst_strides[3] +
+                            //   channel * dst_strides[2] +
+                            //   (height_block * block_size + block_row) * dst_strides[1] +
+                            //   (width_block * block_size + block_col) * element_size
+
+                            std::memcpy(dst_col_ptr, src_block_col_ptr, element_size);
+
+                            src_block_col_ptr += src_block_col_stride;
+                            dst_col_ptr += element_size;
+                        }
+
+                        src_width_block_ptr += element_size;
+                    }
+
+                    src_block_row_ptr += src_block_row_stride;
+                    dst_row_ptr += dst_strides[1];
+                }
+
+                src_height_block_ptr += src_strides[1];
+            }
+
+            src_channel_ptr += src_strides[2];
+            dst_channel_ptr += dst_strides[2];
+        }
+
+        src_batch_ptr += src_strides[3];
+        dst_batch_ptr += dst_strides[3];
+    }
+}
+
+} // namespace cpu
+} // namespace arm_compute