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Optimize block_delay_buffer.

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Reducing pointer following. This will allow the compiler to optimize more efficiently with the "-fno-strict-aliasing" flag.

Bug: None
Change-Id: Ic126bd2d53969a7e9d15e1c1081d5278e27a816c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/238664
Reviewed-by: Per Åhgren <peah@webrtc.org>
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Commit-Queue: Christian Schuldt <cschuldt@google.com>
Cr-Commit-Position: refs/heads/main@{#35414}
This commit is contained in:
cschuldt
2021-11-22 17:59:36 +01:00
committed by WebRTC LUCI CQ
parent 624fb67bbc
commit a018e677f2
1 changed files with 12 additions and 5 deletions
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17
modules/audio_processing/aec3/block_delay_buffer.cc
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@ -41,17 +41,24 @@ void BlockDelayBuffer::DelaySignal(AudioBuffer* frame) {
RTC_DCHECK_EQ(buf_[ch].size(), frame->num_bands());
RTC_DCHECK_EQ(buf_[ch].size(), num_bands);
rtc::ArrayView<float* const> frame_ch(frame->split_bands(ch), num_bands);
const size_t delay = delay_;
for (size_t band = 0; band < num_bands; ++band) {
RTC_DCHECK_EQ(delay_, buf_[ch][band].size());
i = i_start;
for (size_t k = 0; k < frame_length_; ++k) {
const float tmp = buf_[ch][band][i];
buf_[ch][band][i] = frame_ch[band][k];
frame_ch[band][k] = tmp;
// Offloading these pointers and class variables to local variables allows
// the compiler to optimize the below loop when compiling with
// '-fno-strict-aliasing'.
float* buf_ch_band = buf_[ch][band].data();
float* frame_ch_band = frame_ch[band];
i = i < delay_ - 1 ? i + 1 : 0;
for (size_t k = 0, frame_length = frame_length_; k < frame_length; ++k) {
const float tmp = buf_ch_band[i];
buf_ch_band[i] = frame_ch_band[k];
frame_ch_band[k] = tmp;
i = i < delay - 1 ? i + 1 : 0;
}
}
}