[Libre-soc-bugs] [Bug 1223] fosdem 2024 bigint presentation (prerecorded)

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Wed Nov 29 05:36:41 GMT 2023


--- Comment #3 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #2)
> (In reply to Jacob Lifshay from comment #1)
> > (In reply to Luke Kenneth Casson Leighton from comment #0)
> > > 7. bug #1223     Big integer - Jacob
> > >    + Standard long multiply
> > >    + Carry propagation version
> > 
> > sorry, I don't remember which version of bigint multiply you meant by "carry
> > propagation version" -- did you mean using the carry-propagate instructions
> > or did you mean a carry-save multiply?
> entirely up to you as long as they demonstrate REMAP capability rather than
> are a bland superficial SIMD-i-fi-cation of existing tired (not a spelling
> mistake) methods of doing either algorithm

my plan is to demonstrate how bigint*scalar mul using sv.maddedu *without*
remap can do 256x64->320-bit multiplications in the backend (also add/sub).

if you want to also demonstrate REMAP-ified bigint mul, fine, but it'll be the
second half.

tbh, i don't see the need to demo carry-save multiplication, so i'll just drop
that part and consider it replaced with remap bigint mul.

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