Hi Nikolai. ;)

> Dmitry, could you please explain how to apply CORDIC to exponential
> function?
I'm not promising alot but as only will have 20 free minutes to go other
office location I will search for those docs in backed up database of
file
server. I remember that there were many articles in the past how to
apply
CORDIC for non standart math functions and hopefully for exponential
too.
(There was a discussion somewhere that CORDIC can be applied for that
but
doubled iterations are required for some cases)

> I just recently started to learn about that algorithm and how to use
> it for magnitude, phase, sine and cosine calculations. But I would
> like  to  learn  how to use CORDIC for other elementary math. Not much
> pointers on the net :(
Try altavista with: +CORDIC +"math*" +"exponent*" I guess it should
works.

I played with CORDIC together with vertical math to significantly reduce
code size and execution time for some correlation based signal
detection.
Because it is very easy to do number shifting in vertical math. Special
thanks to Scott Dattalo and John Payson. You guys opened a door for me
into such a upside down beautiful world ;)

> BTW, it doesn't look so good for magnitude calculation. It takes
> around 1500 cycles for PIC to find sqrt(x^2+y^2), where x, y are 16
> bit signed numbers. Probably, using good square and square root
> routines would be faster in that case.

1500 is sounding too long.. Probably you are doing correction on
every iteration not finally ? I'll be curious to look your code if
that is possible. Looks like a good candidate for optimization ;)

WBR Dmitry.

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