Georgios Pinitas | 0bc7849 | 2019-03-18 20:07:37 +0000 | [diff] [blame] | 1 | /* |
Sang-Hoon Park | 68dd25f | 2020-10-19 16:00:11 +0100 | [diff] [blame] | 2 | * Copyright (c) 2019-2020 Arm Limited. |
Georgios Pinitas | 0bc7849 | 2019-03-18 20:07:37 +0000 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to |
| 8 | * deal in the Software without restriction, including without limitation the |
| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all |
| 14 | * copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
Michalis Spyrou | f464337 | 2019-11-29 16:17:13 +0000 | [diff] [blame] | 24 | #ifndef ARM_COMPUTE_UTILS_HELPERS_FFT_H |
| 25 | #define ARM_COMPUTE_UTILS_HELPERS_FFT_H |
Georgios Pinitas | 0bc7849 | 2019-03-18 20:07:37 +0000 | [diff] [blame] | 26 | |
| 27 | #include <set> |
| 28 | #include <vector> |
| 29 | |
| 30 | namespace arm_compute |
| 31 | { |
| 32 | namespace helpers |
| 33 | { |
| 34 | namespace fft |
| 35 | { |
| 36 | /** Decompose a given 1D input size using the provided supported factors. |
| 37 | * |
| 38 | * @param[in] N Input size to be decomposed. |
| 39 | * @param[in] supported_factors Supported factors that can be used for decomposition. |
| 40 | * |
| 41 | * @return A vector with the stages of the decomposition. Will be empty if decomposition failed. |
| 42 | */ |
| 43 | std::vector<unsigned int> decompose_stages(unsigned int N, const std::set<unsigned int> &supported_factors); |
| 44 | /** Calculate digit reverse index vector given fft size and the decomposed stages |
| 45 | * |
| 46 | * @param N Input size to calculate digit reverse for |
| 47 | * @param fft_stages A vector with the FFT decomposed stages |
| 48 | * |
| 49 | * @return A vector with the digit reverse indices. Will be empty if it failed. |
| 50 | */ |
| 51 | std::vector<unsigned int> digit_reverse_indices(unsigned int N, const std::vector<unsigned int> &fft_stages); |
| 52 | } // namespace fft |
| 53 | } // namespace helpers |
| 54 | } // namespace arm_compute |
Michalis Spyrou | f464337 | 2019-11-29 16:17:13 +0000 | [diff] [blame] | 55 | #endif /* ARM_COMPUTE_UTILS_HELPERS_FFT_H */ |