// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2009 Mark Borgerding mark a borgerding net
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#include <iostream>
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#include <bench/BenchUtil.h>
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#include <complex>
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#include <vector>
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#include <Eigen/Core>
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#include <unsupported/Eigen/FFT>
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using namespace Eigen;
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using namespace std;
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template <typename T>
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string nameof();
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template <> string nameof<float>() {return "float";}
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template <> string nameof<double>() {return "double";}
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template <> string nameof<long double>() {return "long double";}
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#ifndef TYPE
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#define TYPE float
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#endif
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#ifndef NFFT
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#define NFFT 1024
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#endif
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#ifndef NDATA
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#define NDATA 1000000
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#endif
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using namespace Eigen;
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template <typename T>
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void bench(int nfft,bool fwd,bool unscaled=false, bool halfspec=false)
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{
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typedef typename NumTraits<T>::Real Scalar;
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typedef typename std::complex<Scalar> Complex;
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int nits = NDATA/nfft;
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vector<T> inbuf(nfft);
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vector<Complex > outbuf(nfft);
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FFT< Scalar > fft;
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if (unscaled) {
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fft.SetFlag(fft.Unscaled);
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cout << "unscaled ";
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}
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if (halfspec) {
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fft.SetFlag(fft.HalfSpectrum);
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cout << "halfspec ";
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}
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std::fill(inbuf.begin(),inbuf.end(),0);
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fft.fwd( outbuf , inbuf);
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BenchTimer timer;
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timer.reset();
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for (int k=0;k<8;++k) {
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timer.start();
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if (fwd)
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for(int i = 0; i < nits; i++)
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fft.fwd( outbuf , inbuf);
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else
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for(int i = 0; i < nits; i++)
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fft.inv(inbuf,outbuf);
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timer.stop();
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}
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cout << nameof<Scalar>() << " ";
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double mflops = 5.*nfft*log2((double)nfft) / (1e6 * timer.value() / (double)nits );
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if ( NumTraits<T>::IsComplex ) {
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cout << "complex";
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}else{
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cout << "real ";
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mflops /= 2;
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}
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if (fwd)
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cout << " fwd";
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else
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cout << " inv";
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cout << " NFFT=" << nfft << " " << (double(1e-6*nfft*nits)/timer.value()) << " MS/s " << mflops << "MFLOPS\n";
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}
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int main(int argc,char ** argv)
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{
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bench<complex<float> >(NFFT,true);
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bench<complex<float> >(NFFT,false);
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bench<float>(NFFT,true);
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bench<float>(NFFT,false);
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bench<float>(NFFT,false,true);
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bench<float>(NFFT,false,true,true);
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bench<complex<double> >(NFFT,true);
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bench<complex<double> >(NFFT,false);
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bench<double>(NFFT,true);
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bench<double>(NFFT,false);
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bench<complex<long double> >(NFFT,true);
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bench<complex<long double> >(NFFT,false);
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bench<long double>(NFFT,true);
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bench<long double>(NFFT,false);
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return 0;
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}
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