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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-lib
* Created on: 31 мар. 2020 г.
*
* lsp-dsp-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_DSP_ARCH_AARCH64_ASIMD_FFT_H_
#define PRIVATE_DSP_ARCH_AARCH64_ASIMD_FFT_H_
#ifndef PRIVATE_DSP_ARCH_AARCH64_ASIMD_IMPL
#error "This header should not be included directly"
#endif /* PRIVATE_DSP_ARCH_AARCH64_ASIMD_IMPL */
#include <private/dsp/arch/aarch64/asimd/fft/const.h>
#include <private/dsp/arch/aarch64/asimd/fft/scramble.h>
#include <private/dsp/arch/aarch64/asimd/fft/butterfly.h>
#include <private/dsp/arch/aarch64/asimd/fft/normalize.h>
namespace lsp
{
namespace asimd
{
void direct_fft(float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t rank)
{
// Check bounds
if (rank <= 2)
{
if (rank == 2)
{
float s0_re = src_re[0] + src_re[1];
float s1_re = src_re[0] - src_re[1];
float s2_re = src_re[2] + src_re[3];
float s3_re = src_re[2] - src_re[3];
float s0_im = src_im[0] + src_im[1];
float s1_im = src_im[0] - src_im[1];
float s2_im = src_im[2] + src_im[3];
float s3_im = src_im[2] - src_im[3];
dst_re[0] = s0_re + s2_re;
dst_re[1] = s1_re + s3_im;
dst_re[2] = s0_re - s2_re;
dst_re[3] = s1_re - s3_im;
dst_im[0] = s0_im + s2_im;
dst_im[1] = s1_im - s3_re;
dst_im[2] = s0_im - s2_im;
dst_im[3] = s1_im + s3_re;
}
else if (rank == 1)
{
// s0' = s0 + s1
// s1' = s0 - s1
float s1_re = src_re[1];
float s1_im = src_im[1];
dst_re[1] = src_re[0] - s1_re;
dst_im[1] = src_im[0] - s1_im;
dst_re[0] = src_re[0] + s1_re;
dst_im[0] = src_im[0] + s1_im;
}
else
{
dst_re[0] = src_re[0];
dst_im[0] = src_im[0];
}
return;
}
// Scramble data
if ((dst_re == src_re) || (dst_im == src_im))
{
dsp::move(dst_re, src_re, 1 << rank);
dsp::move(dst_im, src_im, 1 << rank);
scramble_self_direct(dst_re, dst_im, rank);
}
else
scramble_copy_direct(dst_re, dst_im, src_re, src_im, rank);
direct_butterfly_rank3(dst_re, dst_im, 1 << (rank-3));
for (size_t i=4; i <= rank; ++i)
direct_butterfly_rank4p(dst_re, dst_im, i, 1 << (rank - i));
}
void reverse_fft(float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t rank)
{
// Check bounds
if (rank <= 2)
{
if (rank == 2)
{
float s0_re = src_re[0] + src_re[1];
float s1_re = src_re[0] - src_re[1];
float s2_re = src_re[2] + src_re[3];
float s3_re = src_re[2] - src_re[3];
float s0_im = src_im[0] + src_im[1];
float s1_im = src_im[0] - src_im[1];
float s2_im = src_im[2] + src_im[3];
float s3_im = src_im[2] - src_im[3];
dst_re[0] = (s0_re + s2_re)*0.25f;
dst_re[1] = (s1_re - s3_im)*0.25f;
dst_re[2] = (s0_re - s2_re)*0.25f;
dst_re[3] = (s1_re + s3_im)*0.25f;
dst_im[0] = (s0_im + s2_im)*0.25f;
dst_im[1] = (s1_im + s3_re)*0.25f;
dst_im[2] = (s0_im - s2_im)*0.25f;
dst_im[3] = (s1_im - s3_re)*0.25f;
}
else if (rank == 1)
{
// s0' = s0 + s1
// s1' = s0 - s1
float s1_re = src_re[1];
float s1_im = src_im[1];
dst_re[1] = (src_re[0] - s1_re) * 0.5f;
dst_im[1] = (src_im[0] - s1_im) * 0.5f;
dst_re[0] = (src_re[0] + s1_re) * 0.5f;
dst_im[0] = (src_im[0] + s1_im) * 0.5f;
}
else
{
dst_re[0] = src_re[0];
dst_im[0] = src_im[0];
}
return;
}
// Scramble data
if ((dst_re == src_re) || (dst_im == src_im))
{
dsp::move(dst_re, src_re, 1 << rank);
dsp::move(dst_im, src_im, 1 << rank);
scramble_self_reverse(dst_re, dst_im, rank);
}
else
scramble_copy_reverse(dst_re, dst_im, src_re, src_im, rank);
reverse_butterfly_rank3(dst_re, dst_im, 1 << (rank-3));
for (size_t i=4; i <= rank; ++i)
reverse_butterfly_rank4p(dst_re, dst_im, i, 1 << (rank - i));
dsp::normalize_fft2(dst_re, dst_im, rank);
}
}
}
#endif /* PRIVATE_DSP_ARCH_AARCH64_ASIMD_FFT_H_ */
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