| /* |
| * 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 |
