[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 14:17:18 BST 2020


--- Comment #35 from Michael Nolan <mtnolan2640 at gmail.com> ---
So I think I got the floating point cordic all the way working yesterday. It
converts the floating point input to a fixed point 50 bit number, calculates
the sine and cosine, then converts them back to floating point.

However, for the conversion back to floating point I had to write my own class
to do so, as none of the existing ones (used in fpadd for instance) support
*two* outputs. I don't imagine we want to continue using my implementation, so
what would be the best way of going about this?

I also needed to write a module for counting the number of leading zeros in the
fixed point number. I don't imagine this would only be useful to the cordic;
where would be the best place to put it? fpcommon?

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