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Merge pull request #2061 from phire/make-things-better 

Cleanup DotProduct function to make it more readable.
This commit is contained in:
Pierre Bourdon 2015-02-16 00:57:07 +00:00
parent 16a6392308 43dfec07c9
commit 0148deb78c
1 changed files with 14 additions and 10 deletions
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20
Source/Core/AudioCommon/DPL2Decoder.cpp
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@ -41,17 +41,21 @@ static unsigned int len125;
template<class T, class _ftype_t>
static _ftype_t DotProduct(int count, const T *buf, const _ftype_t *coefficients)
{
float sum0=0,sum1=0,sum2=0,sum3=0;
for (;count>=4;buf+=4,coefficients+=4,count-=4)
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[0]*coefficients[0];
sum1+=buf[1]*coefficients[1];
sum2+=buf[2]*coefficients[2];
sum3+=buf[3]*coefficients[3];
sum0 += buf[i + 0] * coefficients[i + 0];
sum1 += buf[i + 1] * coefficients[i + 1];
sum2 += buf[i + 2] * coefficients[i + 2];
sum3 += buf[i + 3] * coefficients[i + 3];
}
while (count--)
sum0+= *buf++ * *coefficients++;
// Epilogue of unrolled loop
for (; i < count; i++)
sum0 += buf[i] * coefficients[i];
return sum0 + sum1 + sum2 + sum3;
}