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Add one level of unrolling to cic2.

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git-svn-id: https://gambatte.svn.sourceforge.net/svnroot/gambatte@258 9dfb2916-2d38-0410-aef4-c5fe6c9ffc24
This commit is contained in:
sinamas 2011-09-04 15:16:25 +00:00
parent ce67eaa844
commit 024370430c
1 changed files with 53 additions and 10 deletions
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63
common/resample/src/cic2.h
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@ -29,7 +29,7 @@ class Cic2Core {
unsigned long sum1;
unsigned long sum2;
unsigned long prev1;
unsigned long prev2;
// unsigned long prev2;
unsigned div_;
unsigned nextdivn;
// unsigned bufpos;
@ -47,7 +47,7 @@ public:
template<unsigned channels>
void Cic2Core<channels>::reset(const unsigned div) {
sum2 = sum1 = 0;
prev2 = prev1 = 0;
/*prev2 = */prev1 = 0;
this->div_ = div;
nextdivn = div;
// bufpos = div - 1;
@ -127,25 +127,68 @@ std::size_t Cic2Core<channels>::filter(short *out, const short *const in, std::s
unsigned long sm2 = sum2;
if (inlen >= nextdivn) {
unsigned divn = nextdivn;
std::size_t n = produced;
do {
{
unsigned divn = nextdivn;
do {
sm1 += static_cast<long>(*s);
s += channels;
sm2 += sm1;
} while (--divn);
const unsigned long out2 = sm2 - prev2;
prev2 = sm2;
const unsigned long out2 = sm2;
sm2 = 0;
*out = rshift16_round(static_cast<long>(out2 - prev1) * mul);
prev1 = out2;
out += channels;
}
if (div_ & 1) {
std::size_t n = produced;
divn = div_;
} while (--n);
while (--n) {
unsigned divn = div_ >> 1;
do {
sm1 += static_cast<long>(*s);
s += channels;
sm2 += sm1;
sm1 += static_cast<long>(*s);
s += channels;
sm2 += sm1;
} while (--divn);
sm1 += static_cast<long>(*s);
s += channels;
sm2 += sm1;
*out = rshift16_round(static_cast<long>(sm2 - prev1) * mul);
out += channels;
prev1 = sm2;
sm2 = 0;
}
} else {
std::size_t n = produced;
while (--n) {
unsigned divn = div_ >> 1;
do {
sm1 += static_cast<long>(*s);
s += channels;
sm2 += sm1;
sm1 += static_cast<long>(*s);
s += channels;
sm2 += sm1;
} while (--divn);
*out = rshift16_round(static_cast<long>(sm2 - prev1) * mul);
out += channels;
prev1 = sm2;
sm2 = 0;
}
}
nextdivn = div_;
}