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Possible optimization #21

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ast opened this issue Aug 30, 2019 · 4 comments
Closed

Possible optimization #21

ast opened this issue Aug 30, 2019 · 4 comments

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@ast
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ast commented Aug 30, 2019

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

Something to think about, perhaps.
@touil
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touil commented Aug 30, 2019 •
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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.

@touil touil closed this as completed Aug 30, 2019
@ast
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ast commented Aug 30, 2019

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
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touil commented Aug 30, 2019

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

@ast
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ast commented Aug 30, 2019

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

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