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added real-optimized inverse FFT (NFFT must be multiple of 4)

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This commit is contained in:
Mark Borgerding
2009-05-25 23:52:21 -04:00
parent 03ed6f9bfb
commit 09b4733255
2 changed files with 370 additions and 348 deletions
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30
bench/benchFFT.cpp
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@@ -53,7 +53,7 @@ template <> string nameof<long double>() {return "long double";}
using namespace Eigen;
template <typename T>
void bench(int nfft)
void bench(int nfft,bool fwd)
{
typedef typename NumTraits<T>::Real Scalar;
typedef typename std::complex<Scalar> Complex;
@@ -69,7 +69,10 @@ void bench(int nfft)
for (int k=0;k<8;++k) {
timer.start();
for(int i = 0; i < nits; i++)
fft.fwd( outbuf , inbuf);
if (fwd)
fft.fwd( outbuf , inbuf);
else
fft.inv(inbuf,outbuf);
timer.stop();
}
@@ -82,16 +85,27 @@ void bench(int nfft)
mflops /= 2;
}
if (fwd)
cout << " fwd";
else
cout << " inv";
cout << " NFFT=" << nfft << " " << (double(1e-6*nfft*nits)/timer.value()) << " MS/s " << mflops << "MFLOPS\n";
}
int main(int argc,char ** argv)
{
bench<complex<float> >(NFFT);
bench<float>(NFFT);
bench<complex<double> >(NFFT);
bench<double>(NFFT);
bench<complex<long double> >(NFFT);
bench<long double>(NFFT);
bench<complex<float> >(NFFT,true);
bench<complex<float> >(NFFT,false);
bench<float>(NFFT,true);
bench<float>(NFFT,false);
bench<complex<double> >(NFFT,true);
bench<complex<double> >(NFFT,false);
bench<double>(NFFT,true);
bench<double>(NFFT,false);
bench<complex<long double> >(NFFT,true);
bench<complex<long double> >(NFFT,false);
bench<long double>(NFFT,true);
bench<long double>(NFFT,false);
return 0;
}