[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 #65 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #64)
> (In reply to Jacob Lifshay from comment #63)
> 
> > assembler/disassembler and insndb...this is because sv.maddedu needs to put
> > RS in RT + MAXVL, which isn't what happens currently, currently we just
> > hardcode the simulator to behave as if EXTRA2_MODE = 1 for an arbitrary
> > subset of instructions.
> 
> rats. which... yep i was avoiding that as it's quite a lot of small
> changes in lots of areas. including binutils.

oh, wait, I just thought of an easy workaround:

just set SVSHAPE3's offset to -1, which puts RS in RT - 1, this works since
SVSHAPE3 would have otherwise been set to always give zero as the remapped
index.

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