1 files changed, 33 insertions, 0 deletions
diff --git a/webrtc/modules/audio_processing/aec3/fft_data_avx2.cc b/webrtc/modules/audio_processing/aec3/fft_data_avx2.cc
new file mode 100644
index 0000000..1fe4bd6
--- /dev/null
+++ b/webrtc/modules/audio_processing/aec3/fft_data_avx2.cc
@@ -0,0 +1,33 @@
+/*
+ *  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 "modules/audio_processing/aec3/fft_data.h"
+
+#include <immintrin.h>
+
+#include "api/array_view.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