GNUradio has the whole VOLK infrastructure in place to provide generic
code + optimized code per architecture + run time selection and even
benchmarking to select the fastest version.

So I would suggest just using the volk_8i_s32f_convert_32 kernel and
be done with it.
If some current code is faster than the current volk implementations
available, then a second patch can be submitted to volk to add this
arch specific implementation and allow it to be used.



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