[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 #19 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #15)
> (In reply to Jacob Lifshay from comment #14)

> > for i in range(0, length, chunk_size):
> >     sum += reduce_chunk(VL=chunk_size)
> > sum += reduce_tail(VL=length % chunk_size)  # dynamic VL here
> 
> drat, you're right.
> 
> of course. okaaay sigh so this involves creating a new Form, with Parallel
> Reduction similar to svshape2 "carving out" its own niche... urrr...

ah. realised there's a complication. VL and MAXVL determines the number
of operations carried out, not the width of the reduction.

for now the tail will have to be done by recursive macros using
immediates manually.

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