diff options
Diffstat (limited to 'third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc')
-rw-r--r-- | third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc b/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc new file mode 100644 index 0000000000..00799dae02 --- /dev/null +++ b/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2012 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 "common_audio/signal_processing/dot_product_with_scale.h" + +#include "rtc_base/numerics/safe_conversions.h" + +int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1, + const int16_t* vector2, + size_t length, + int scaling) { + int64_t sum = 0; + size_t i = 0; + + /* Unroll the loop to improve performance. */ + for (i = 0; i + 3 < length; i += 4) { + sum += (vector1[i + 0] * vector2[i + 0]) >> scaling; + sum += (vector1[i + 1] * vector2[i + 1]) >> scaling; + sum += (vector1[i + 2] * vector2[i + 2]) >> scaling; + sum += (vector1[i + 3] * vector2[i + 3]) >> scaling; + } + for (; i < length; i++) { + sum += (vector1[i] * vector2[i]) >> scaling; + } + + return rtc::saturated_cast<int32_t>(sum); +} |