[PD] efficient approximation of trig functions for hi pass formula (was: could vanilla borrow iemlib's hi pass filter recipe?)

[Dan Wilcox]

I think a core commenting sprint would be *very* helpful, specially to those of us (me) who would like help in understanding the black magic inside.

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Dan Wilcox
@danomatika <https://twitter.com/danomatika>
danomatika.com <http://danomatika.com/>
robotcowboy.com <http://robotcowboy.com/>
> On Oct 19, 2016, at 12:57 PM, pd-list-request at lists.iem.at wrote:
> 
> That is an important question. Pd code is full of clever tricks and
> bit hacks for dsp efficiency. What is the origin of q8_rsqrt(), why
> and how does it work? What about PD_BIGORSMALL() in m_pd.h? And the
> mysterious UNITBIT32 number in d_osc.c? Ideally such code should be
> commented not only to denote its function (if necessary) but also to
> reference the origin so you may be able to find info.

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