1 files changed, 66 insertions, 0 deletions
diff --git a/src/core/NEON/kernels/arm_conv/depthwise/depthwise_common.cpp b/src/core/NEON/kernels/arm_conv/depthwise/depthwise_common.cpp
new file mode 100644
index 0000000000..2950d5e957
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+++ b/src/core/NEON/kernels/arm_conv/depthwise/depthwise_common.cpp
@@ -0,0 +1,66 @@
+/*
+ * 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 "depthwise_common.hpp"
+
+#include "utils.hpp"
+
+using arm_gemm::iceildiv;
+
+namespace arm_conv {
+namespace depthwise {
+
+std::tuple<size_t, size_t, size_t, size_t, size_t>
+get_reduced_view_for_dilation(size_t out_size, size_t in_size, const size_t d,
+                              const size_t dilation_factor,
+                              const size_t kernel_size, const size_t stride,
+                              const size_t orig_pad_before) {
+    // Get the valid output range
+    out_size = iceildiv(out_size - d, dilation_factor);
+
+    // Compute the start offset and the amount of padding which applies to this
+    // portion of the work.
+    size_t start_pos = d * stride, pad_before = 0;
+    if (start_pos < orig_pad_before) {
+        pad_before = iceildiv(orig_pad_before - start_pos, dilation_factor);
+    }
+    start_pos += pad_before * dilation_factor - orig_pad_before;
+
+    // Hence compute the valid input range
+    in_size = start_pos < in_size
+                  ? iceildiv(in_size - start_pos, dilation_factor)
+                  : 0;
+
+    // Finally, compute the "after" padding
+    const size_t reqd_input = (out_size - 1) * stride + kernel_size;
+    size_t pad_after = 0;
+    if (reqd_input > (pad_before + in_size)) {
+        pad_after = reqd_input - (pad_before + in_size);
+    }
+
+    return std::make_tuple(out_size, in_size, start_pos, pad_before, pad_after);
+}
+
+}  // namespace depthwise
+}  // namespace arm_conv