[Libre-soc-isa] [Bug 936] Decide if we want to change the spec so RC1=1 fail-first instructions always write all outputs up to and including failing element

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=936

--- Comment #1 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
well, the purpose of VLi mode is simply to save an annoying
"VL += 1" in hot-loops, on detection of truncation.  if that
can at least be detected then it's fine, no need to modify
the spec.

my feeling is that it *may* be worthwhile thinking of a new
RM Mode for this type of instruction, one which uses CR.lt
and CR.gt as indicators whether to increase srcstep and
dststep.

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