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+/*
+ * 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.
+ */
+
+#ifndef CKW_INCLUDE_CKW_TILEOPERAND_H
+#define CKW_INCLUDE_CKW_TILEOPERAND_H
+
+#include <cstdint>
+
+namespace ckw
+{
+
+class KernelWriter;
+class TensorOperand;
+class ITile;
+class TileInfo;
+
+/** A tile operand refers to a tile object that can be used for kernel writing. */
+class TileOperand
+{
+public:
+ // The constructor and _tile field is completely hidden from the public API to avoid any misuse.
+ // Only kernel writer and tensor operand classes create and interact with tile operand hence we allow them to access this field.
+ friend class KernelWriter;
+ friend class TensorOperand;
+
+ /** Create an empty tile operand.
+ *
+ * The new tile operand doesn't refer to any tile therefore it is not useable.
+ */
+ TileOperand();
+
+ /** Check if the tile operand contains a tile and therefore useable. */
+ bool is_valid() const;
+
+ /** Get the tile info. */
+ const TileInfo &tile_info() const;
+
+ /** Get a row vector of the current tile operand.
+ *
+ * @param[in] row The index of the row to be accessed in the current tile operand.
+ *
+ * @return A new tile operand referring to a row of the current tile operand.
+ */
+ TileOperand row(int32_t row) const;
+
+ /** Get a scalar element of the current tile operand.
+ *
+ * @param[in] row The index of the row to be accessed in the current tile operand.
+ * @param[in] col The index of the column to be accessed in the current tile operand.
+ *
+ * @return A new tile operand referring to a scalar element of the current tile operand.
+ */
+ TileOperand scalar(int32_t row, int32_t col) const;
+
+private:
+ // These are hidden from the public API to avoid any misuse.
+
+ /** Initialize a new instance of @ref TileOperand class for the given tile. */
+ TileOperand(ITile &tile);
+
+ /** Initialize a new instance of @ref TileOperand class that is the sub-tile of the given tile. */
+ TileOperand(const TileOperand &operand, int32_t row_start, int32_t row_end, int32_t col_start, int32_t col_end);
+
+ /** Get a sub-tile of the current tile operand.
+ *
+ * The range of rows and columns is defined by pairs of start and end indices, inclusive lower and exclusive upper.
+ * In other words, any row and column indices satisfying the following conditions will be part of the sub-tile:
+ *
+ * row_start <= row_index < row_end
+ * col_start <= col_index < col_end
+ *
+ * @param[in] row_start The start index of the row range.
+ * @param[in] row_end The end index of the row range.
+ * @param[in] col_start The start index of the column range.
+ * @param[in] col_end The end index of the column range.
+ *
+ * @return A new tile operand refering to the same tile but with the new active area.
+ */
+ TileOperand tile(int32_t row_start, int32_t row_end, int32_t col_start, int32_t col_end) const;
+
+ ITile *_tile;
+
+ int32_t _row_start;
+ int32_t _row_end;
+ int32_t _col_start;
+ int32_t _col_end;
+};
+
+} // namespace ckw
+
+#endif // CKW_INCLUDE_CKW_TILEOPERAND_H