Unsafe vs MemorySegments / Bounds checking...

[Maurizio Cimadamore]

On 29/10/2024 18:35, Brian S O'Neill wrote:
> If you recall, I did send you a reproducer, and you did verify the 
> regression. This is what led you to come up with a strategy to define 
> a derived VarHandle. This helped somewhat, but you observed the 
> inliner giving up when the code was embedded in a very large method. 
> JDK 23 appears to have introduced a regression that has made this worse. 

The fact that you mention that 23 made it worse reminds me of [1], where 
a fix in 23 created an issue for adapted memory access var handles.

If I recall correctly, the workaround we suggested was _also_ using 
adapted var handles.

So I wonder if (a) you were already running into the issue in [1] and 
(b) because of that JDK 23 made it worse for you.

Did you have a chance to try your project with the latest JDK 24 build? 
Is the regression gone there? That would be useful to know regardless of 
the wider discussion.

Maurizio

[1] - 
https://mail.openjdk.org/pipermail/panama-dev/2024-September/020643.html