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/*
* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <immintrin.h>
#include "api/array_view.h"
#include "modules/audio_processing/aec3/fft_data.h"
namespace webrtc {
// Computes the power spectrum of the data.
void FftData::SpectrumAVX2(rtc::ArrayView<float> power_spectrum) const {
RTC_DCHECK_EQ(kFftLengthBy2Plus1, power_spectrum.size());
for (size_t k = 0; k < kFftLengthBy2; k += 8) {
__m256 r = _mm256_loadu_ps(&re[k]);
__m256 i = _mm256_loadu_ps(&im[k]);
__m256 ii = _mm256_mul_ps(i, i);
ii = _mm256_fmadd_ps(r, r, ii);
_mm256_storeu_ps(&power_spectrum[k], ii);
}
power_spectrum[kFftLengthBy2] = re[kFftLengthBy2] * re[kFftLengthBy2] +
im[kFftLengthBy2] * im[kFftLengthBy2];
}
} // namespace webrtc
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