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airspy / airspyhf

Code repository for AirspyHF+
BSD 3-Clause "New" or "Revised" License
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Possible optimization #21

Closed ast closed 5 years ago

ast commented 5 years ago

-ffast-math is not included i -O3, and SDR doesn't really need strict IEEE754 complience.

Something to think about, perhaps.

touil commented 5 years ago

Floats are already at the edge in our IQ correction algorithm (120+ dB image rejection). With fast-math, there will be a numerical stability problem in special signal conditions. I use fast-math elsewhere where it's really needed.

ast commented 5 years ago

Interesting. I will definitly take a look at that.

By the way, what's the reason you have "re-implemented" complex arithmatic? Is complex.h not availble on some platforms you target or did you experience some other problem?

touil commented 5 years ago

Of course, platform availability. Have a look on this algo. Fun guaranteed!

ast commented 5 years ago

Every time I learn about some new nice DSP tricks it's like Christmas!