COMPMID-1235: Implements StridedSlice for CL

Change-Id: If2b44da31fae528c76be742b4b3a21fb0eb06b49
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/145284
Reviewed-by: Giuseppe Rossini <giuseppe.rossini@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/arm_compute/core/CL/kernels/CLStridedSliceKernel.h b/arm_compute/core/CL/kernels/CLStridedSliceKernel.h
new file mode 100644
index 0000000000..e104dcfdd7
--- /dev/null
+++ b/arm_compute/core/CL/kernels/CLStridedSliceKernel.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2018 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 __ARM_COMPUTE_CL_STRIDED_SLICE_KERNEL_H__
+#define __ARM_COMPUTE_CL_STRIDED_SLICE_KERNEL_H__
+
+#include "arm_compute/core/CL/ICLKernel.h"
+#include "arm_compute/core/Types.h"
+
+#include <cstdint>
+
+namespace arm_compute
+{
+// Forward declarations
+class ICLTensor;
+
+/** Interface for the kernel to perform tensor strided slicing */
+class CLStridedSliceKernel : public ICLKernel
+{
+public:
+    /** Default constructor */
+    CLStridedSliceKernel();
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    CLStridedSliceKernel(const CLStridedSliceKernel &) = delete;
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    CLStridedSliceKernel &operator=(const CLStridedSliceKernel &) = delete;
+    /** Allow instances of this class to be moved */
+    CLStridedSliceKernel(CLStridedSliceKernel &&) = default;
+    /** Allow instances of this class to be moved */
+    CLStridedSliceKernel &operator=(CLStridedSliceKernel &&) = default;
+    /** Default destructor */
+    ~CLStridedSliceKernel() = default;
+    /** Configure kernel
+     *
+     * @note Supported tensor rank: up to 4
+     *
+     * @param[in]  input            Source tensor. Data type supported: U8/S8/QASYMM8/U16/S16/U32/S32/F16/F32
+     * @param[out] output           Destination tensor. Data type supported: Same as @p input
+     * @param[in]  starts           The starts of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in]  ends             The ends of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in]  strides          The strides of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in]  begin_mask       If the ith bit of begin_mask is set, starts[i] is ignored and the fullest possible range in that dimension is used instead.
+     * @param[in]  end_mask         If the ith bit of end_mask is set, ends[i] is ignored and the fullest possible range in that dimension is used instead.
+     * @param[in]  shrink_axis_mask If the ith bit of shrink_axis_mask is set, it implies that the ith specification shrinks the dimensionality by 1.
+     *                              A slice of size 1 starting from starts[i] in the dimension must be preserved.
+     */
+    void configure(const ICLTensor *input, ICLTensor *output,
+                   const Coordinates &starts, const Coordinates &ends, const BiStrides &strides,
+                   int32_t begin_mask, int32_t end_mask, int32_t shrink_axis_mask);
+
+    /** Static function to check if given info will lead to a valid configuration of @ref CLStridedSliceKernel
+     *
+     * @note Supported tensor rank: up to 4
+     *
+     * @param[in] input            Source tensor. Data type supported: U8/S8/QASYMM8/U16/S16/U32/S32/F16/F32
+     * @param[in] output           Destination tensor. Data type supported: Same as @p input
+     * @param[in] starts           The starts of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in] ends             The ends of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in] strides          The strides of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in] begin_mask       If the ith bit of begin_mask is set, starts[i] is ignored and the fullest possible range in that dimension is used instead.
+     * @param[in] end_mask         If the ith bit of end_mask is set, ends[i] is ignored and the fullest possible range in that dimension is used instead.
+     * @param[in] shrink_axis_mask If the ith bit of shrink_axis_mask is set, it implies that the ith specification shrinks the dimensionality by 1.
+     *                             A slice of size 1 starting from starts[i] in the dimension must be preserved.
+     */
+    static Status validate(const ITensorInfo *input, const ITensorInfo *output,
+                           const Coordinates &starts, const Coordinates &ends, const BiStrides &strides,
+                           int32_t begin_mask, int32_t end_mask, int32_t shrink_axis_mask);
+
+    // Inherited methods overridden:
+    void run(const Window &window, cl::CommandQueue &queue) override;
+
+private:
+    const ICLTensor *_input;  /**< Source tensor */
+    ICLTensor       *_output; /**< Destination tensor */
+};
+} // namespace arm_compute
+#endif /*__ARM_COMPUTE_CL_STRIDED_SLICE_KERNEL_H__ */