[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 #6 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #5)
> please write out a loop of what you think SNZ should do in simple mode. I
> expect that you will find it to be entirely redundant.

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!

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