74 lines
2 KiB
C++
74 lines
2 KiB
C++
#include "kissfft.hh"
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#include <iostream>
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#include <cstdlib>
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#include <typeinfo>
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#include <sys/time.h>
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static inline
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double curtime(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return (double)tv.tv_sec + (double)tv.tv_usec*.000001;
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}
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using namespace std;
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template <class T>
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void dotest(int nfft)
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{
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typedef kissfft<T> FFT;
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typedef std::complex<T> cpx_type;
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cout << "type:" << typeid(T).name() << " nfft:" << nfft;
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FFT fft(nfft,false);
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vector<cpx_type> inbuf(nfft);
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vector<cpx_type> outbuf(nfft);
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for (int k=0;k<nfft;++k)
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inbuf[k]= cpx_type(
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(T)(rand()/(double)RAND_MAX - .5),
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(T)(rand()/(double)RAND_MAX - .5) );
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fft.transform( &inbuf[0] , &outbuf[0] );
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long double totalpower=0;
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long double difpower=0;
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for (int k0=0;k0<nfft;++k0) {
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complex<long double> acc = 0;
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long double phinc = 2*k0* M_PIl / nfft;
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for (int k1=0;k1<nfft;++k1) {
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complex<long double> x(inbuf[k1].real(),inbuf[k1].imag());
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acc += x * exp( complex<long double>(0,-k1*phinc) );
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}
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totalpower += norm(acc);
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complex<long double> x(outbuf[k0].real(),outbuf[k0].imag());
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complex<long double> dif = acc - x;
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difpower += norm(dif);
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}
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cout << " RMSE:" << sqrt(difpower/totalpower) << "\t";
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double t0 = curtime();
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int nits=20e6/nfft;
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for (int k=0;k<nits;++k) {
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fft.transform( &inbuf[0] , &outbuf[0] );
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}
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double t1 = curtime();
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cout << " MSPS:" << ( (nits*nfft)*1e-6/ (t1-t0) ) << endl;
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}
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int main(int argc,char ** argv)
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{
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if (argc>1) {
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for (int k=1;k<argc;++k) {
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int nfft = atoi(argv[k]);
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dotest<float>(nfft); dotest<double>(nfft); dotest<long double>(nfft);
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}
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}else{
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dotest<float>(32); dotest<double>(32); dotest<long double>(32);
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dotest<float>(1024); dotest<double>(1024); dotest<long double>(1024);
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dotest<float>(840); dotest<double>(840); dotest<long double>(840);
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}
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return 0;
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}
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