[Haskell-cafe] sharing

Carter Schonwald carter.schonwald at gmail.com
Wed Feb 5 22:06:34 UTC 2020

it looks like bluespec open sourced their tool chain (though its build
system is a tad confusing when i tried to build it on my mac )

the clash build setup process looks positively relaxing by comparison :)
On Wed, Feb 5, 2020 at 12:40 PM Tom Schouten <tom at zwizwa.be> wrote:

> On 2/5/20 10:39 AM, Carter Schonwald wrote:
> Try using clash, its its own thing, and overanalysis might be more
> challenging than just trying it out
> Fair point.
> - There is another Functional HDL that solves this using some unsafe
>> reference trick to keep track of the sharing. I believe it is C╬╗aSH but I'm
>> not sure. I believe you can get away with this because the semantics is
>> pure so in practice doesn't cause any inconsistencies, but it really
>> doesn't sound like something I would do without some kind of proof that it
>> is actually ok. If it is ok, it would probably make sense to abstract this
>> in a library. Maybe someone has done that already?
> I was able to recover some information from my notes. I ran into this a
> while ago, then decided to keep the implementation simple and just use
> Monads:
> A survey in Andy Gill's presentation on observable sharing:
> http://www.ittc.ku.edu/~andygill/talks/20090903-hask.pdf
> Just checked the Clash website and there is a link to Christiaan Baaij's
> master thesis, which has a description of the sharing problem in Appendix C:
> https://essay.utwente.nl/59482/1/scriptie_C_Baaij.pdf
> I think there is probably a use for a generic library that can do this
> kind of sharing recovery. Still I'm not quite happy with the "can be unsafe
> in some cases" remarks and would like to learn more. However there might be
> a tradeoff to use this as a simplified interface to something that is
> implemented in a safe monadic style under the hood.
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