[libre-riscv-dev] [Bug 208] implement CORDIC in a general way sufficient to do transcendentals

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue May 5 18:30:44 BST 2020


--- Comment #54 from Michael Nolan <mtnolan2640 at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #53)
> ok what else can we throw in here?  LOG1P is probably a good thing to try
> i know - somewhere - i've seen a python implementation of vector mode.
> it also specified, as you can see, the three other modes: circular,
> linear, hyperbolic.
> ah!  i know why we want to keep the two answers: see p39 of that
> thesis: you can use them (with some post-processing) to do
> tan.

Yep, that was my thought. 

> "vector" mode the vector is rotated to be flat against the x-axis,
> recording the angle (Z) needed to do so.
> if you can drop that into a repository, get it working, write a
> few simple experiments and see how it operates in each of the 6
> modes, we're on a roll :)

I can give it a whirl I suppose

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