On 07/04/2018 16.06, Oleg Grenrus wrote:

I hope Hadrian topics qualify under "building GHC from source"?

Of course!

Hi, I'd also be happy to help. At the very least I can be around as a mentor, but if I can find a suitable hask I may also host a hacking session. Ömer 2018-04-08 16:01 GMT+03:00 Michal Terepeta :

On Sat, Apr 7, 2018 at 3:34 PM Niklas Hambüchen wrote:

...

Hi GHC devs,

The ZuriHac 2018 conference will feature a GHC DevOps track (which Andreas and I are coordinating), that will be all about fostering contributions to GHC and learning to hack it. There will be a room or two allocated at Zurihac for this purpose. [...] Please contact Andreas or me (on this list or privately) if you think you could help in any of these directions! If you're not sure, contact us anyway and tell us your idea!

Best, Niklas and Andreas ZuriHac 2018 GHC DevOps track coordinators

Hi Niklas, Andreas,

I'd be happy to help. :) I know a bit about the backend (e.g., cmm level), but it might be tricky to find there some smaller/self-contained projects that would fit ZuriHac. You've mentioned performance regression tests - maybe we could also work on improving nofib?

- Michal

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On 08/04/2018 15.01, Michal Terepeta wrote:

I'd be happy to help. :) I know a bit about the backend (e.g., cmm level), but it might be tricky to find there some smaller/self-contained projects that would fit ZuriHac.

Hey Michal, that's great. Is there a topic you would like to give a talk about, or a pet peeve task that you'd like to tick off with the help of new potential contributors in a hacking session? Other topics that might be nice and that you might know about are "How do I add a new primop to GHC", handling all the way from the call on the Haskell side to emitting the code, or (if I remember that correctly) checking out that issue that GHC doesn't do certain optimisations yet (such as emitting less-than-full-word instructions e.g. for adding two Word8s, or lack of some strength reductions as in [1]).

You've mentioned performance regression tests - maybe we could also work on improving nofib?

For sure! Shall we run a hacking session together where we let attendees work on both performance regression tests and nofib? It seems these two fit well together. Niklas [1]: https://stackoverflow.com/questions/23315001/maximizing-haskell-loop-perform...

Hey Michal, sorry for the late reply on my side too, I had a surprisingly busy weekend. I think what you propose is great, let's do it and allocate you a talk slot. Do you have a preferred time? I think having some improvisation in it is totally OK: After all, we're aiming at GHC beginners, so the point of the talks is to get them motivated and some ideas what topics they could work on. Best, Niklas On 28/05/2018 19.13, Michal Terepeta wrote:

Hi Niklas,

Sorry for slow reply - I'm totally snowed under at the moment.

I should be able to give some overview/examples of what are primops and how they go through the compilation pipeline. And talk a bit about the Cmm-level parts of GHC. But I won't have much time to prepare, so there might be fair amount of improvisation...

Are you coming to this week's HaskellerZ meetup? We could chat a bit more about this.

Cheers!