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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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24
Source/Core/AudioCommon/DPL2Decoder.cpp
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@ -39,21 +39,25 @@ static float *filter_coefs_lfe;
static unsigned int len125; static unsigned int len125;
template<class T, class _ftype_t> template<class T, class _ftype_t>
static _ftype_t DotProduct(int count,const T *buf,const _ftype_t *coefficients) static _ftype_t DotProduct(int count, const T *buf, const _ftype_t *coefficients)
{ {
float sum0=0,sum1=0,sum2=0,sum3=0; int i;
for (;count>=4;buf+=4,coefficients+=4,count-=4) 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]; sum0 += buf[i + 0] * coefficients[i + 0];
sum1+=buf[1]*coefficients[1]; sum1 += buf[i + 1] * coefficients[i + 1];
sum2+=buf[2]*coefficients[2]; sum2 += buf[i + 2] * coefficients[i + 2];
sum3+=buf[3]*coefficients[3]; sum3 += buf[i + 3] * coefficients[i + 3];
} }
while (count--) // Epilogue of unrolled loop
sum0+= *buf++ * *coefficients++; for (; i < count; i++)
sum0 += buf[i] * coefficients[i];
return sum0+sum1+sum2+sum3; return sum0 + sum1 + sum2 + sum3;
} }
template<class T> template<class T>