On 12 April 2018 at 22:45, John McIntosh <johnmci at smalltalkconsulting.com>
wrote:

> Actually it is a 64bit compiled application that works with 32bit images,
> there was also a 64bit application that works with 64bit images. However
> was Eliot points out the format of a 64bit image is different because it
> has other immediate types, and different context structures. The original
> 64bit image type didn't have any of those changes.
>

​The Spur image, yes.

But we're only talking about running a 32 bit image on a 64 bit VM. Here's
a refresher on the terminology:

http://squeakvm.org/squeak64/faq.html​

- Bert -



>
>
> On Thu, Apr 12, 2018 at 1:34 PM, Bert Freudenberg <bert at freudenbergs.de>
> wrote:
>
>>
>>
>> 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 -​
>>
>>
>>
>>
>>
>
>
> --
> ============================================================
> ===============
> John M. McIntosh. Corporate Smalltalk Consulting Ltd
> https://www.linkedin.com/in/smalltalk
> ============================================================
> ===============
>
>
>
>
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