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/*
* Copyright (c) 2019 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_FFT_H
#define ARM_COMPUTE_UTILS_HELPERS_FFT_H
#include <set>
#include <vector>
namespace arm_compute
{
namespace helpers
{
namespace fft
{
/** Decompose a given 1D input size using the provided supported factors.
*
* @param[in] N Input size to be decomposed.
* @param[in] supported_factors Supported factors that can be used for decomposition.
*
* @return A vector with the stages of the decomposition. Will be empty if decomposition failed.
*/
std::vector<unsigned int> decompose_stages(unsigned int N, const std::set<unsigned int> &supported_factors);
/** Calculate digit reverse index vector given fft size and the decomposed stages
*
* @param N Input size to calculate digit reverse for
* @param fft_stages A vector with the FFT decomposed stages
*
* @return A vector with the digit reverse indices. Will be empty if it failed.
*/
std::vector<unsigned int> digit_reverse_indices(unsigned int N, const std::vector<unsigned int> &fft_stages);
} // namespace fft
} // namespace helpers
} // namespace arm_compute
#endif /* ARM_COMPUTE_UTILS_HELPERS_FFT_H */
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