[Vm-dev] Re: [Pharo-dev] 32 bits and 64 bits VM

[phil at highoctane.be]

On Fri, May 16, 2014 at 10:20 AM, Esteban Lorenzano <estebanlm at gmail.com>wrote:

>
> On 15 May 2014, at 18:46, Hilaire Fernandes <hilaire.fernandes at gmail.com>
> wrote:
>
> > Great.
> >
> > As we are discussing about build, is it possible to compile CogVM on 64
> > bits architecture as it is already the case for the interpreted SqueakVM
> > (https://packages.debian.org/sid/squeak-vm)?
>
> I do not understand. To compile a regular vm in a 64bits platform is
> trivial. You just need to have the 32bits library installed.
> But to have a 64bits vm that runs on 64bits… that’s another very different
> history:
>
> - you need a 64bits image (so trace, export, etc.)
>

ImageTracers are intriguing to me :-) Is this in some way relatable to Oz?
What's that project doing now? It was very interesting/useful. Guille?


> - you need to be 64bits word size aware (not so complicated, but a lot of
> work).
> - you need 64bits plugins (a lot of them)
> - you need 64bits JIT (or no JIT at all)
>
>
And...

* 64-bit aware hashing functions as the current ones are 32-bit centric.
So, not so trivial I'd say. (what's the plan?)

* special care of the Float which will be directly in a 64 bit "oop" - I
guess we'll face some fun here. Especially with the float plugin.

As a side note, I see that http://www.mpfr.org/ is supported by INRIA. WTF
aren't we considering this ? LGPL and INRIA may help getting some special
thing for Pharo.

Phil


> Some time ago there was an experimental 64bits interpreter vm (not even
> stack). Who worked with a special traced image.
> What squeak guys are doing in the link you provide is still building a
> 32bits vm.
>
> Now. In the agenda for this year is to work on a 64bits spur version. If
> everything is fine and the stars align properly, it will be ready around
> christmas.
>
> Esteban
>
>
> >
> > Hilaire
> >
> > Le 15/05/2014 18:24, Esteban Lorenzano a écrit :
> >> so yes… I integrated the fix, created a pull request, waited until
> validation… and then I forget to merge :S
> >> it should be in process to build now.
> >
> > --
> > Dr. Geo http://drgeo.eu
> >
> >
>
>
>
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