[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
Thu Apr 21 21:09:00 BST 2022


--- Comment #3 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #2)
> (In reply to Luke Kenneth Casson Leighton from comment #1)
> > msubed and madded are *not* the same as what was initially
> > proposed (that was maddx and msubx).
> yup.
> > 
> > msubed and madded are the *new* idea (you came up with) but the
> > divmnu.c source has *not* been updated.
> yeah, as stated on irc, sorry i haven't yet fixed it.

except that i only came up with madded, msubed is something that you apparently
interpolated out of msubx and madded -- msubed isn't needed for the div
algorithm since the required negation is already done by subfe.

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