[Libre-soc-isa] [Bug 817] Big Integer Math (sv.adde, sv.subfe, sv.madded, 128 by 64-bit -> 64-bit div/rem, maybe more...)

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri Apr 22 09:06:39 BST 2022


--- Comment #8 from Jacob Lifshay <programmerjake at gmail.com> ---
I implemented a WIP version of goldschmidt division, for the 128x64->64-bit
division instructions. I didn't yet figure out the correct values for the
additional internal precision needed, but I found a paper describing how to
calculate them ... they showed that the parameters used for AMD's K8 were too
loose, meaning the K8 has more internal precision than needed, wasting gates.


The paper I found:
Even, G., Seidel, P. M., & Ferguson, W. E. (2003).
A Parametric Error Analysis of Goldschmidt's Division Algorithm.

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