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fft_channelizer: use volk_32fc_s32fc_multiply2_32fc #206

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Nov 17, 2024
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fft_channelizer: use volk_32fc_s32fc_multiply2_32fc #206

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21 changes: 19 additions & 2 deletions lib/fft_channelizer_impl.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -342,18 +342,35 @@ int fft_channelizer_impl::work(int noutput_items,
// Construct the input to the reverse FFT. We need to copy the two halves
// as the output of the initial FFT still is [DC, Positive Freq, Negative
// Freq].

gr_complex scale = 1. / d_fft_size;
#if VOLK_VERSION_MAJOR >= 3 && VOLK_VERSION_MINOR >= 1
volk_32fc_s32fc_multiply2_32fc(
&d_ifft.get_inbuf()[0],
&d_fft.get_outbuf()[positive_offset(
d_fft_size, d_output_step, j, d_ifft_size)],
&scale,
d_ifft_size / 2);
volk_32fc_s32fc_multiply2_32fc(
&d_ifft.get_inbuf()[d_ifft_size / 2],
&d_fft.get_outbuf()[negative_offset(
d_fft_size, d_output_step, j, d_ifft_size)],
&scale,
d_ifft_size / 2);
#else
volk_32fc_s32fc_multiply_32fc(
&d_ifft.get_inbuf()[0],
&d_fft.get_outbuf()[positive_offset(
d_fft_size, d_output_step, j, d_ifft_size)],
1. / d_fft_size,
scale,
d_ifft_size / 2);
volk_32fc_s32fc_multiply_32fc(
&d_ifft.get_inbuf()[d_ifft_size / 2],
&d_fft.get_outbuf()[negative_offset(
d_fft_size, d_output_step, j, d_ifft_size)],
1. / d_fft_size,
scale,
d_ifft_size / 2);
#endif
d_ifft.execute();

if (output_items.size() > 0) {
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