[Libre-soc-isa] [Bug 1183] add /mrr mode (reverse mode) to Data-Dependent Fail-First CR_ops

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1183

--- Comment #9 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #8)
> (In reply to Jacob Lifshay from comment #6)
> 
> > I expect you'll end up with something like:
> > 
> > for i in range(VL):
> >     if CR[i].lt:
> >         RT[i] = RA[i] + RB[i]
> >         pred = nothing-really
> >     else:
> >         pred = SNZ
> >     # nothing uses pred!
> 
> this pseudocode is wrong, it is not how SNZ works with
> DDFF. please read the spec pseudocode and if nothing
> else ISACaller.

this is for *simple mode*, which is (also with map-reduce mode) where I'm now
objecting to introducing SNZ. I am no longer objecting to SNZ in dd-ff.

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