[Libre-soc-bugs] [Bug 1155] O(n^2) multiplication REMAP mode(s)

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1155

--- Comment #19 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #17)
> (In reply to Jacob Lifshay from comment #14)
> > i had an idea for SVSHAPE: if we can get a matrix mode with 3 spare bits
> > (e.g. a flag that repurposes some bits somewhere), then we can use them like
> > so:
> > 000 normal matrix mode
> > 001 x
> > 010 y
> > 011 x + y
> > 100 z
> > 101 x + z
> > 110 y + z
> > 111 x + y + z
> 
> *deep breath*... i love it!

we can take all the combinations that duplicate something already encodable in
matrix mode and just declare them reserved, so at least 000 and 001, icr if
matrix mode can produce a sequence like 000011112222333300001111... which would
cover both 010 and 100 too.

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