[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]

https://bugs.libre-soc.org/show_bug.cgi?id=817

--- Comment #1 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #0)
> Couldn't find a bug for this so made one.

ta. forgot.

> My comments on that video (basically looks good except that division uses
> sv.madded and sv.subfe not sv.msubed and sv.subfe):
> https://libre-soc.org/irclog/%23libre-soc.2022-04-21.log.html#t2022-04-21T19:
> 38:17

msubed and madded are *not* the same as what was initially
proposed (that was maddx and msubx).

msubed and madded are the *new* idea (you came up with) but the
divmnu.c source has *not* been updated.

i easily worked out the mul case, updated mulmnu.c to match:
div i can't handle.

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