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#define kiss_fftr SUF(kiss_fftr,KF_SUFFIX)
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#define kiss_fftri SUF(kiss_fftri,KF_SUFFIX)
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Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
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kiss_twiddle_cpx * super_twiddles;
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typedef struct kiss_fftr_state *kiss_fftr_cfg;