35 lines
1.2 KiB
C++
35 lines
1.2 KiB
C++
/*
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* Copyright (c) 2012 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 "common_audio/signal_processing/dot_product_with_scale.h"
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#include "rtc_base/numerics/safe_conversions.h"
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int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1,
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const int16_t* vector2,
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size_t length,
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int scaling) {
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int64_t sum = 0;
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size_t i = 0;
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/* Unroll the loop to improve performance. */
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for (i = 0; i + 3 < length; i += 4) {
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sum += (vector1[i + 0] * vector2[i + 0]) >> scaling;
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sum += (vector1[i + 1] * vector2[i + 1]) >> scaling;
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sum += (vector1[i + 2] * vector2[i + 2]) >> scaling;
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sum += (vector1[i + 3] * vector2[i + 3]) >> scaling;
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}
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for (; i < length; i++) {
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sum += (vector1[i] * vector2[i]) >> scaling;
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}
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return rtc::saturated_cast<int32_t>(sum);
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}
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