On 12 April 2018 at 16:31, Tobias Pape <Das.Linux at gmx.de> wrote:

> Hi
>
> On 12.04.2018, at 16:05, Eliot Miranda <eliot.miranda at gmail.com> wrote:
>
> Hi Bert,
>
>
> On Apr 12, 2018, at 6:03 AM, Bert Freudenberg <bert at freudenbergs.de>
> wrote:
>
> If that's indeed the case we need to make a 64 bit VM for 32 bit images. I
> think this should be just a matter of picking the right compiler options.
>
>
> How so?  AFAIA it is not.  It means, for example, changing every memory
> access for an instance variable from 64 to 32 bits.  It is non-trivial.
>
>
> But wasn't that done once already?
>
> I see Squeak 5.7.4.1 (John Macintosh did it I think).
> Wich advertises itself as
>
> and worked very well. Not saying every bits are there for the present
> (spur etc)
> but at least, we have been there already at least once…
>

​Yep. Its just the 32 bit VM compiled on a 64 bit host. This worked without
big problems on the interpreter. I don't know what additional constraints
are imposed by Cog / Spur, but I thought at least for intel, the 32 bit
instruction set was a strict subset of x64, so there should be no big
problems.

- Bert -​
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