[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 #22 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #16)

> if RA = 0 then x_len <- VL
> else x_len <- (RA)
> VL <- remapped_len(x_len, ...)
> # since we don't want to set MAXVL from a GPR:
> MAXVL <- remapped_len(x_len=MAXVL, ...)

this will fail on the next iteration unless preceded by a
setvl MAXVL=n instruction.

my feeling is that this should be done after the first round,
investigating EXT1xx variants of SVP64 Management instructions.

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