// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Mark Borgerding mark a borgerding net
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <iostream>
#include <bench/BenchUtil.h>
#include <complex>
#include <vector>
#include <Eigen/Core>
#include <unsupported/Eigen/FFT>
using namespace Eigen;
using namespace std;
template <typename T>
string nameof();
template <> string nameof<float >() {return "float" ;}
template <> string nameof<double >() {return "double" ;}
template <> string nameof<long double >() {return "long double" ;}
#ifndef TYPE
#define TYPE float
#endif
#ifndef NFFT
#define NFFT 1024
#endif
#ifndef NDATA
#define NDATA 1000000
#endif
using namespace Eigen;
template <typename T>
void bench(int nfft,bool fwd,bool unscaled=false , bool halfspec=false )
{
typedef typename NumTraits<T>::Real Scalar;
typedef typename std::complex<Scalar> Complex;
int nits = NDATA/nfft;
vector<T> inbuf(nfft);
vector<Complex > outbuf(nfft);
FFT< Scalar > fft;
if (unscaled) {
fft.SetFlag(fft.Unscaled);
cout << "unscaled " ;
}
if (halfspec) {
fft.SetFlag(fft.HalfSpectrum);
cout << "halfspec " ;
}
std::fill(inbuf.begin(),inbuf.end(),0);
fft.fwd( outbuf , inbuf);
BenchTimer timer;
timer.reset();
for (int k=0;k<8;++k) {
timer.start();
if (fwd)
for (int i = 0; i < nits; i++)
fft.fwd( outbuf , inbuf);
else
for (int i = 0; i < nits; i++)
fft.inv(inbuf,outbuf);
timer.stop();
}
cout << nameof<Scalar>() << " " ;
double mflops = 5.*nfft*log2((double )nfft) / (1e6 * timer.value() / (double )nits );
if ( NumTraits<T>::IsComplex ) {
cout << "complex" ;
}else {
cout << "real " ;
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,true );
bench<complex<float > >(NFFT,false );
bench<float >(NFFT,true );
bench<float >(NFFT,false );
bench<float >(NFFT,false ,true );
bench<float >(NFFT,false ,true ,true );
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;
}
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