piwalker/dolphin
1
0
Fork 0
mirror of https://github.com/dolphin-emu/dolphin.git synced 2025-07-23 14:19:46 -06:00
Code Issues Packages Projects Releases Wiki Activity

DPL2Decoder: Simplify DotProduct

Browse Source
This commit is contained in:
MerryMage
2017-04-22 21:23:19 +01:00
parent 42a1f7939d
commit 4f884d0b2f
1 changed files with 2 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
Source/Core/AudioCommon/DPL2Decoder.cpp
View File

@ -12,6 +12,7 @@
#include <cstdlib> #include <cstdlib>
#include <cstring> #include <cstring>
#include <functional> #include <functional>
#include <numeric>
#include <vector> #include <vector>
#include "AudioCommon/DPL2Decoder.h" #include "AudioCommon/DPL2Decoder.h"
@ -41,23 +42,7 @@ static unsigned int len125;
template <class T> template <class T>
static float DotProduct(int count, const T* buf, const std::vector<float>& coeffs, int offset) static float DotProduct(int count, const T* buf, const std::vector<float>& coeffs, int offset)
{ {
int i; return std::inner_product(buf, buf + count, coeffs.begin() + offset, T(0));
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;
} }
template <class T> template <class T>