[Cuis-dev] Cuis won't launch on CogSpur Arm64 MacOS when not using mixed arithmetic

[Juan Vuletich]

Hi Alan,

On 11/3/2022 4:20 AM, Alan Dao via Cuis-dev wrote:
> Hey all,
>
> I've recently switched to an Arm64 Macbook. One of the first things I 
> did on it was launch the latest base image of Cuis (6.0-5542). To my 
> surprise, the Arm64 CogSpur VM crashes when launching the base image. 
> However, the Stack VM successfully launches the base image. I looked 
> at the crash.dmp and saw that the CogSpur crash was happening in 
> SystemDictionary>doMixedArithmetic. In the base image, this method is 
> called with a False value from SystemDictionary>doStartUp.
>
> I used the Stack VM to change the image such that 
> SystemDictionary>doMixedArithmetic is called with a True value. After 
> this, I was able to successfully launch the MixedArithmetic image on 
> my Arm64 Macbook.

This looks like a VM bug. You can confirm this by using Squeak or Pharo, 
and doing `Smalltalk doMixedArithmethic: false`. It should also crash. 
Same with the Cuis image you were able to start by setting it to true. 
If so, please report the bug in vm-dev: 
http://lists.squeakfoundation.org/mailman/listinfo/vm-dev

> Does anyone know why using mixed arithmetic isn't the default? To my 
> surprise, the base images for Pharo and Squeak were able to launch 
> without any modifications, so I'm assuming they're by default using 
> mixed arithmetic.

The explanation is in the comment at #doMixedArithmetic. Please take a 
look. It is about letting the image (and not the VM) handle arguably 
decisions WRT conversions between number types. If you find it cryptic 
or have further questions, please ask here.

> I've attached my crash.dmp to this email for those who're curious.
>
> Best,
> Alan

I'm pretty sure you are the first to exercise this corner of the VM. 
Please report in vm-dev. I'm sure they'll fix it.

Thanks,

-- 
Juan Vuletich
cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
linkedin.com/in/juan-vuletich-75611b3
twitter.com/JuanVuletich

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.cuis.st/mailman/archives/cuis-dev/attachments/20221103/15bcbfd1/attachment.htm>