[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 #31 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #28)
> in software, this would be 12 adds, and 7 shifts, so 19 instructions. in HW,
> using carry-save adders for the final sum, this could likely be done in 1
> cycle, 2 at the very most.

note, 19 instructions isn't even including the extra instructions to set
SVSHAPE*.

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