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DPL2Decoder: Simplify DotProduct

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MerryMage 2017-04-22 21:23:19 +01:00
parent 42a1f7939d
commit 4f884d0b2f
1 changed files with 2 additions and 17 deletions
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19
Source/Core/AudioCommon/DPL2Decoder.cpp
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@ -12,6 +12,7 @@
#include <cstdlib>
#include <cstring>
#include <functional>
#include <numeric>
#include <vector>
#include "AudioCommon/DPL2Decoder.h"
@ -41,23 +42,7 @@ static unsigned int len125;
template <class T>
static float DotProduct(int count, const T* buf, const std::vector<float>& coeffs, int offset)
{
int i;
float sum0 = 0.0f, sum1 = 0.0f, sum2 = 0.0f, sum3 = 0.0f;
// Unrolled loop
for (i = 0; (i + 3) < count; i += 4)
{
sum0 += buf[i + 0] * coeffs[offset + i + 0];
sum1 += buf[i + 1] * coeffs[offset + i + 1];
sum2 += buf[i + 2] * coeffs[offset + i + 2];
sum3 += buf[i + 3] * coeffs[offset + i + 3];
}
// Epilogue of unrolled loop
for (; i < count; i++)
sum0 += buf[i] * coeffs[offset + i];
return sum0 + sum1 + sum2 + sum3;
return std::inner_product(buf, buf + count, coeffs.begin() + offset, T(0));
}
template <class T>