Patrick Strasser wrote:
Hello!
Following the discussion about Intel libraries[0] and sse
optimization[1], I did some literature recherche about elementary
functions (trigonometric functions, log, exp). In particular I hope to
find some clever methods to speed up atan and sin/cos, which would be
very handy for all the FM stuff. But I need some parameters to find
useful methods:
I think that having a family of speedups for common operations would be
nice. We can categorize them as to accuracy so that you can choose the
real operation if you can't tolerate reduced accuracy. Also, it is
almost never necessary for us to have full double precision operations.
We almost always use single precision and often that is overkill.
Here are a few quick tips I found looking around, which might be useful
for gnuradio:
http://www.dspguru.com/comp.dsp/tricks/alg/sincos.htm
http://www.dspguru.com/comp.dsp/tricks/alg/mag_est.htm
http://www.dspguru.com/comp.dsp/tricks/alg/mag_est2.htm
http://www.dspguru.com/comp.dsp/tricks/alg/fxdatan2.htm
http://www.dspguru.com/comp.dsp/tricks/alg/dc_block.htm
http://www.dspguru.com/comp.dsp/tricks/alg/quicklog.htm
Matt
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