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#pragma once
#include <cstdint>
#include <vector>
#include <algorithm>
#include <cmath>
#include "config.h"
#include <cstring>
template<class T>
inline void SwapArray(T* p, const size_t len) {
for (size_t i = 0, j = len - 1; i < len / 2; ++i, --j) {
T tmp = p[i];
p[i] = p[j];
p[j] = tmp;
}
}
template<size_t N>
inline void InvertSpectrInPlase(TFloat* in) {
for (size_t i = 0; i < N; i+=2)
in[i] *= -1;
}
template<size_t N>
inline std::vector<TFloat> InvertSpectr(const TFloat* in) {
std::vector<TFloat> buf(N);
std::memcpy(&buf[0], in, N * sizeof(TFloat));
InvertSpectrInPlase<N>(&buf[0]);
return buf;
}
inline uint16_t GetFirstSetBit(uint32_t x) {
static const uint16_t multiplyDeBruijnBitPosition[32] = {
0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31
};
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
return multiplyDeBruijnBitPosition[(uint32_t)(x * 0x07C4ACDDU) >> 27];
}
template<class T>
inline uint16_t Log2FloatToIdx(T x, uint16_t shift) {
T t = x * shift;
return GetFirstSetBit(std::trunc(t));
}
template<class T>
inline T CalcMedian(T* in, uint32_t len) {
std::vector<T> tmp(in, in+len);
std::sort(tmp.begin(), tmp.end());
uint32_t pos = (len - 1) / 2;
return tmp[pos];
}
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