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