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Diffstat (limited to 'src/core/helpers/Utils.h')
-rw-r--r-- | src/core/helpers/Utils.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/core/helpers/Utils.h b/src/core/helpers/Utils.h new file mode 100644 index 0000000000..3c3b2b93f9 --- /dev/null +++ b/src/core/helpers/Utils.h @@ -0,0 +1,97 @@ +/* +* Copyright (c) 2020 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 */ |