[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 #12 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #9)

> this is for *simple mode*, which is (also with map-reduce mode) where I'm
> now objecting to introducing SNZ. 

look again at the table. SNZ is not present. it depends critically
on there being some sort of test-and-stop (sv.bc has branch-fail/success,
DDFF has "end-loop")

there is no SNZ for simple mode.

this is how it works:

https://git.libre-soc.org/?p=libreriscv.git;a=blob;f=openpower/sv/branches.mdwn;h=7aea7936fcff5fb7709bae9459255c593185af4d;hb=a3f5eea083533cb3828f0d2a4375c49e2a7b30f1#l598

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