[Libre-soc-isa] [Bug 1071] add parallel prefix sum remap mode

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1071

--- Comment #13 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #12)
> other thing I noticed, we need a svshape instruction that can take a dynamic
> length and produce the prefix-sum or reduce schedules, currently svshape
> only supports constant lengths.

they're all very deliberately immediate-based because it otherwise
means that the establishment of REMAP Schedules is dependent on
GPR registers.  the sole exception is Indexed REMAP and even that
is an "indicator to trigger the process of cacheing GPRs" rather than
"actual Hazard"

what's the story there? why is dynamic length needed?

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