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, 84 insertions, 0 deletions

diff --git a/arm_compute/core/utils/helpers/tensor_transform.h b/arm_compute/core/utils/helpers/tensor_transform.h
new file mode 100644
index 0000000000..e5b32a5372
--- /dev/null
+++ b/arm_compute/core/utils/helpers/tensor_transform.h
@@ -0,0 +1,84 @@
+/*
+ * 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_UTILS_HELPERS_TENSOR_TRANSFORM_H__
+#define __ARM_COMPUTE_UTILS_HELPERS_TENSOR_TRANSFORM_H__
+
+#include "arm_compute/core/Types.h"
+
+namespace arm_compute
+{
+namespace helpers
+{
+namespace tensor_transform
+{
+/** Returns the absolute start coordinates of strided slice
+ *
+ * @param[in] input_shape Input tensor shape
+ * @param[in] starts      Start coordinates
+ * @param[in] strides     Slice strides
+ * @param[in] begin_mask  (Optional) If the ith bit of begin_mask is set, begin[i] is ignored and
+ *                        the fullest possible range in that dimension is used instead.
+ *
+ * @return Absolute start coordinates
+ */
+Coordinates strided_slice_absolute_start_coords(TensorShape input_shape, Coordinates starts, Coordinates strides, int32_t begin_mask = 0);
+
+/** Returns the absolute ends coordinates of strided slice
+ *
+ * @param[in] input_shape      Input tensor shape
+ * @param[in] starts_abs       Absolute start coordinates
+ * @param[in] ends             End coordinates
+ * @param[in] strides          Slice strides
+ * @param[in] end_mask         (Optional) If the ith bit of end_mask is set, end[i] is ignored and
+ *                             the fullest possible range in that dimension is used instead.
+ * @param[in] shrink_axis_mask (Optional) 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 begin[i] in the dimension must be preserved.
+ *
+ * @return Absolute end coordinates
+ */
+Coordinates strided_slice_absolute_end_coords(TensorShape input_shape, Coordinates starts_abs, Coordinates ends, Coordinates strides,
+                                              int32_t end_mask = 0, int32_t shrink_axis_mask = 0);
+/** Returns the final strides of strided slice
+ *
+ * @param[in] input_shape Input tensor shape
+ * @param[in] strides     Slice strides
+ *
+ * @return The final strides need by strided slice
+ */
+Coordinates strided_slice_strides(TensorShape input_shape, Coordinates strides);
+
+/** Computes output shape of a strided slice
+ *
+ * @param[in] input_shape   Input tensor shape
+ * @param[in] starts_abs    Absolute start coordinates
+ * @param[in] ends_abs      Absolute end coordinates
+ * @param[in] final_strides Slice strides
+ *
+ * @return The output tensor shape
+ */
+TensorShape compute_strided_slice_output_shape(TensorShape input_shape, Coordinates starts_abs, Coordinates ends_abs, Coordinates final_strides);
+} // namespace tensor_tranform
+} // namespace helpers
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_UTILS_HELPERS_TENSOR_TRANSFORM_H__ */