[Libre-soc-bugs] [Bug 656] add v3.0B BCD instructions to simulator

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=656

--- Comment #22 from Jacob Lifshay <programmerjake at gmail.com> ---
explanation of why addg6s is useful:
https://libre-soc.org/irclog/%23libre-soc.2021-08-01.log.html#t2021-08-01T10:10:13

> addg6s is used for doing a BCD addition, like x86's daa instruction:
> https://www.felixcloutier.com/x86/daa
> afaict to do a bcd add of a and b, you do `add r, a, b` then
> `addg6s t, a, b` then `add r, r, t`

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