[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 #74 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #72)

> well, perfect: I said we don't need signed offset, but turns out we still do.

joy. luckily the whole purpose of the NLnet grants is to find these
things out :) 

hmm hmm, find another bit.
https://libre-soc.org/openpower/sv/draft_opcode_tables/

i know, move svshape3 to draft/temp-PO5 then use a 4-bit XO
for svshape4, something like:

| 0:5|6:9|10  |11:15  |16:20 | 21 22:23 24:25 |26:27| 28:31 | Form   |
| -- |---|----| ---   | ---- | -------------- | --  | ------| -------- |
| PO |SVo|SVyx| y     | x    | sk /sm2 / sm   | si  | XO    |TODO-Form |

where si and SVyz have swapped places compared to what i did previously.

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