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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 "modules/audio_processing/aec3/vector_math.h"
#include <immintrin.h>
#include <math.h>
#include "api/array_view.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace aec3 {
// Elementwise square root.
void VectorMath::SqrtAVX2(rtc::ArrayView<float> x) {
const int x_size = static_cast<int>(x.size());
const int vector_limit = x_size >> 3;
int j = 0;
for (; j < vector_limit * 8; j += 8) {
__m256 g = _mm256_loadu_ps(&x[j]);
g = _mm256_sqrt_ps(g);
_mm256_storeu_ps(&x[j], g);
}
for (; j < x_size; ++j) {
x[j] = sqrtf(x[j]);
}
}
// Elementwise vector multiplication z = x * y.
void VectorMath::MultiplyAVX2(rtc::ArrayView<const float> x,
rtc::ArrayView<const float> y,
rtc::ArrayView<float> z) {
RTC_DCHECK_EQ(z.size(), x.size());
RTC_DCHECK_EQ(z.size(), y.size());
const int x_size = static_cast<int>(x.size());
const int vector_limit = x_size >> 3;
int j = 0;
for (; j < vector_limit * 8; j += 8) {
const __m256 x_j = _mm256_loadu_ps(&x[j]);
const __m256 y_j = _mm256_loadu_ps(&y[j]);
const __m256 z_j = _mm256_mul_ps(x_j, y_j);
_mm256_storeu_ps(&z[j], z_j);
}
for (; j < x_size; ++j) {
z[j] = x[j] * y[j];
}
}
// Elementwise vector accumulation z += x.
void VectorMath::AccumulateAVX2(rtc::ArrayView<const float> x,
rtc::ArrayView<float> z) {
RTC_DCHECK_EQ(z.size(), x.size());
const int x_size = static_cast<int>(x.size());
const int vector_limit = x_size >> 3;
int j = 0;
for (; j < vector_limit * 8; j += 8) {
const __m256 x_j = _mm256_loadu_ps(&x[j]);
__m256 z_j = _mm256_loadu_ps(&z[j]);
z_j = _mm256_add_ps(x_j, z_j);
_mm256_storeu_ps(&z[j], z_j);
}
for (; j < x_size; ++j) {
z[j] += x[j];
}
}
} // namespace aec3
} // namespace webrtc
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