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Extract loop into static method.

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Performance boost as compiler is no longer updating member variable every pass through the loop.
This commit is contained in:
Jared Boone 2017-01-06 16:59:57 -08:00
parent 05eb694c0a
commit 052fd1c407
1 changed files with 19 additions and 9 deletions
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28
firmware/baseband/channel_stats_collector.hpp
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@ -36,15 +36,7 @@ class ChannelStatsCollector {
public: public:
template<typename Callback> template<typename Callback>
void feed(const buffer_c16_t& src, Callback callback) { void feed(const buffer_c16_t& src, Callback callback) {
auto src_p = simd32_ptr(src.p); max_squared = compute_max_squared(src, max_squared);
const auto end_p = simd32_ptr(&src.p[src.count]);
while(src_p < end_p) {
const uint32_t sample = *(src_p++);
const uint32_t mag_sq = __SMUAD(sample, sample);
if( mag_sq > max_squared ) {
max_squared = mag_sq;
}
}
count += src.count; count += src.count;
const size_t samples_per_update = src.sampling_rate * update_interval; const size_t samples_per_update = src.sampling_rate * update_interval;
@ -63,6 +55,24 @@ private:
static constexpr float update_interval { 0.1f }; static constexpr float update_interval { 0.1f };
uint32_t max_squared { 0 }; uint32_t max_squared { 0 };
size_t count { 0 }; size_t count { 0 };
static uint32_t compute_max_squared(
const buffer_c16_t& src,
uint32_t max_squared
) {
auto p = simd32_ptr(src.p);
const auto end_p = simd32_ptr(&src.p[src.count]);
while(p < end_p) {
const uint32_t sample = *(p++);
const uint32_t mag_sq = __SMUAD(sample, sample);
if( mag_sq > max_squared ) {
max_squared = mag_sq;
}
}
return max_squared;
}
}; };
#endif/*__CHANNEL_STATS_COLLECTOR_H__*/ #endif/*__CHANNEL_STATS_COLLECTOR_H__*/