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Premature optimization of MatchedFilter::shift_by_decimation_factor().

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This commit is contained in:
Jared Boone 2015-11-05 22:09:38 -08:00
parent 4afcc83873
commit 3d5c8056d9
1 changed files with 18 additions and 1 deletions
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19
firmware/baseband/matched_filter.cpp
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@ -65,7 +65,24 @@ bool MatchedFilter::execute_once(
} }
void MatchedFilter::shift_by_decimation_factor() { void MatchedFilter::shift_by_decimation_factor() {
std::move(&samples_[decimation_factor_], &samples_[taps_count_], &samples_[0]); const sample_t* s = &samples_[decimation_factor_];
sample_t* t = &samples_[0];
const size_t unroll_factor = 4;
size_t shift_count = (taps_count_ - decimation_factor_) / unroll_factor;
while(shift_count > 0) {
*t++ = *s++;
*t++ = *s++;
*t++ = *s++;
*t++ = *s++;
shift_count--;
}
shift_count = (taps_count_ - decimation_factor_) % unroll_factor;
while(shift_count > 0) {
*t++ = *s++;
shift_count--;
}
} }
} /* namespace matched_filter */ } /* namespace matched_filter */