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

[bugzilla-daemon at libre-soc.org]

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

--- Comment #6 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #5)
> basically the parallel reduction algorithm we use is similar to only the
> first loop in work-efficient prefix-sum, the second loop is missing
> https://git.libre-soc.org/?p=nmutil.git;a=blob;f=src/nmutil/prefix_sum.py;
> h=23eca36e2bb748c296c5a7ca88b9fa578258c653;hb=HEAD#l71

for a visual diagram, see:
https://git.libre-soc.org/?p=nmutil.git;a=blob;f=src/nmutil/test/test_prefix_sum.py;h=2b88407216ccad3fc99a7d633331a30a3d3f562f;hb=HEAD#l164

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