| /* |
| * Copyright (c) 2020-2021 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 SRC_CORE_HELPERS_UTILS_H |
| #define SRC_CORE_HELPERS_UTILS_H |
| |
| #include "arm_compute/core/ITensorInfo.h" |
| |
| namespace arm_compute |
| { |
| /** Create a strides object based on the provided strides and the tensor dimensions. |
| * |
| * @param[in] info Tensor info object providing the shape of the tensor for unspecified strides. |
| * @param[in] stride_x Stride to be used in X dimension (in bytes). |
| * @param[in] fixed_strides Strides to be used in higher dimensions starting at Y (in bytes). |
| * |
| * @return Strides object based on the specified strides. Missing strides are |
| * calculated based on the tensor shape and the strides of lower dimensions. |
| */ |
| template <typename T, typename... Ts> |
| inline Strides compute_strides(const ITensorInfo &info, T stride_x, Ts &&... fixed_strides) |
| { |
| const TensorShape &shape = info.tensor_shape(); |
| |
| // Create strides object |
| Strides strides(stride_x, fixed_strides...); |
| |
| for(size_t i = 1 + sizeof...(Ts); i < info.num_dimensions(); ++i) |
| { |
| strides.set(i, shape[i - 1] * strides[i - 1]); |
| } |
| |
| return strides; |
| } |
| |
| /** Create a strides object based on the tensor dimensions. |
| * |
| * @param[in] info Tensor info object used to compute the strides. |
| * |
| * @return Strides object based on element size and tensor shape. |
| */ |
| template <typename... Ts> |
| inline Strides compute_strides(const ITensorInfo &info) |
| { |
| return compute_strides(info, info.element_size()); |
| } |
| |
| /** Given an integer value, this function returns the next power of two |
| * |
| * @param[in] x Input value |
| * |
| * @return the next power of two |
| */ |
| inline unsigned int get_next_power_two(unsigned int x) |
| { |
| // Decrement by 1 |
| x--; |
| |
| // Shift right by 1 |
| x |= x >> 1u; |
| // Shift right by 2 |
| x |= x >> 2u; |
| // Shift right by 4 |
| x |= x >> 4u; |
| // Shift right by 8 |
| x |= x >> 8u; |
| // Shift right by 16 |
| x |= x >> 16u; |
| |
| // Increment by 1 |
| x++; |
| |
| return x; |
| } |
| } // namespace arm_compute |
| |
| #endif /* SRC_CORE_HELPERS_UTILS_H */ |