[patch] performance improvement in gr-osmosdr (hackrf)

[Alain Carlucci]

Hi,

I have submitted a pull request on Github[1] which improves the
performance of the hackrf source. With this patch the conversion

In this way the compiler is able to generate AVX/SSE code (-O3
-march=native) to perform the conversion.

In [2] you can find a benchmark to show the differences.
Using -Ofast (or -O3) and -march=native I get ~2.8x using an
Intel i7 (4th gen) and 3.1x on a Core i5 (6th gen).

Gqrx with the patched library can play a WFM radio without any
interruption even with just 3 buffers (option="hackrf=0,buffers=3").

Best regards,
Alain

[1] https://github.com/osmocom/gr-osmosdr/pull/14
[2] https://gist.github.com/carpikes/cad029c338605f70d9f687aeee447db4

int8_t -> float is done in realtime instead of looking up values in the "_lut" lookup table.

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