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fix: fft missing break #273

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mdionisio
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I'm not sure about the fix and I'm not able now to execute test because I'm on on intel machine. But only reading the code it seams that there is a missing break.

@peter-toft-greve
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Yeah - looks like that

@peter-toft-greve
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Anyone reading this other than @mdionisio ?

@mdionisio
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I can only say that:

if 'ne10_radix_8_butterfly_float32_c' is well implemented my fix is correct.

The previous one was not bugged for result because the generic function is called but is bugger for performance because
the output is computed 2 times.

So with my fix the _c version of fft has better performance.

I'm not able to run test on arm with neon now. But in teory if test continue o run correctly it means that all is ok because the neon version is not changed

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