From: bugzilla-daemon@libre-soc.org
To: libre-riscv-dev@lists.libre-riscv.org
Subject: [libre-riscv-dev] [Bug 316] bperm TODO
Date: Tue, 19 May 2020 19:30:51 +0000
Message-ID: <bug-316-13-YYBJzjunN7@https.bugs.libre-soc.org/> (raw)
In-Reply-To: <bug-316-13@https.bugs.libre-soc.org/>
https://bugs.libre-soc.org/show_bug.cgi?id=316
--- Comment #51 from Cole Poirier <colepoirier@gmail.com> ---
(In reply to Michael Nolan from comment #50)
> I'm not sure I would. To me, a proof should be as simple as possible to
> understand, because you need to be able to check the proof against the
> specification. The existing proof is clear enough to allow it to be checked
> against the pseudocode, and doesn't take an inordinate amount of time, so I
> think it's fine to leave it as is.
Makes sense to me!
> So yeah, I'd say try hooking it up to main_stage and adding a test for it
> would be better than trying to "optimize" the proof. Especially since
> there's a bug in the module that the proof hasn't revealed (hint: it has to
> do with power's numbering of bits).
Is this the big-endian comment you left in the pseudo-code? Is that documented
in the spec? Looking at POWERISA v3.1 doesn't look like it notes this, unless
there is some esoteric notation that denotes this? Or POWERISA is just always
big-endian?
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