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better, reduced mutliply in real fft

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This commit is contained in:
Mark Borgerding
2003-12-10 05:48:42 +00:00
parent b880c599ef
commit 8a992d0e98
3 changed files with 31 additions and 27 deletions
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34
test/test_real.c
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@ -34,9 +34,7 @@ double snr_compare( kiss_fft_cpx * vec1,kiss_fft_cpx * vec2, int n)
printf( "\npoor snr, try a scaling factor %f\n" , scale );
return snr;
}
#define RANDOM
#ifndef RANDOM
#define NFFT 8
#else
@ -80,6 +78,22 @@ int main()
kiss_fftr(kiss_fftr_state,sin,sout);
printf( "nfft=%d, inverse=%d, snr=%g\n",
NFFT,0, snr_compare(cout,sout,(NFFT/2)+1) );
#ifdef RANDOM
ts = cputime();
for (i=0;i<NUMFFTS;++i) {
kiss_fft(kiss_fft_state,cin,cout);
}
tfft = cputime() - ts;
ts = cputime();
for (i=0;i<NUMFFTS;++i) {
kiss_fftr( kiss_fftr_state, sin, cout );
/* kiss_fftri(kiss_fftr_state,cout,sin); */
}
trfft = cputime() - ts;
printf("%d complex ffts took %gs, real took %gs\n",NUMFFTS,tfft,trfft);
#endif
free(kiss_fft_state);
free(kiss_fftr_state);
@ -99,22 +113,6 @@ int main()
printf( "nfft=%d, inverse=%d, snr=%g\n",
NFFT,1, snr_compare(cin,cin,NFFT/2) );
#ifdef RANDOM
ts = cputime();
for (i=0;i<NUMFFTS;++i) {
kiss_fft(kiss_fft_state,cin,cout);
}
tfft = cputime() - ts;
ts = cputime();
for (i=0;i<NUMFFTS;++i) {
/* kiss_fftr(kiss_fftr_state,sin,cout); */
kiss_fftri(kiss_fftr_state,cout,sin);
}
trfft = cputime() - ts;
printf("%d complex ffts took %gs, real took %gs\n",NUMFFTS,tfft,trfft);
#endif
free(kiss_fft_state);
free(kiss_fftr_state);