Re: regression on zOS between 5.4.8 to 5.5.0 on zOS

On Thu, Jan 22, 2026 at 9:50 AM Denis Dos Santos Silva <[email protected]> wrote:
>
> Thank you for the detailed explanation.
>
> Following up on your comments, I set up a clean sandbox environment to validate the behavior locally using the same simplified script.
>
> The setup completed successfully, and the tests ran as expected in this environment.

Hi, Thanks for this, but maybe I didn't stress this aspect properly:
For me it's only an issue on the combination of zOS AND 5.5.0.

The same SW stack and automated test works for me on AIX (which is
also Big Endian), Windows, Linux/x86_64, Linux/s390x, and
Linux/ppc64le
The previous stack, with 5.4.8 or even 5.2.2. worked OK on the above + zOS

My suspicion is that something about the structs, unions, and
shifting/masking around the representation of the stack is not as
portable as 5.4.8.
But I didn't get very far trying various de-optimizations in lobject.h
and lopcodes.h

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