[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 #14 from Jacob Lifshay <programmerjake at gmail.com> ---
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

this gives us all the different things matrix mode can do for each of the x,y,z
axes, and lets us extract just one axis, or sum axes together. invxyz lets us
subtract them too.

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