Difference between [jdk20] Thread.ensureMaterializedForStackWalk and Blackhole.

[dean.long at oracle.com]

My understanding is that they are similar, but disable different 
optimizations.  A blackhole is to disable dead-code elimination, while 
ensureMaterializedForStackWalk is to disable scalarization.

dl

On 1/29/24 12:15 AM, shami wrote:
> Hello,
>
> I am trying to understand the JDK20 intrinsic - 
> Thread.ensureMaterializedForStackWalk 
> (https://github.com/openjdk/jdk/pull/10952/files).
>
> It seems to be functionally equivalent to the /Blackhole.consume/ 
> intrinsic.
>
> Is there any subtle difference(s) between the two, or can one be 
> implemented using the other?
>
> Thanks in advance.
> Shami.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mail.openjdk.org/pipermail/hotspot-compiler-dev/attachments/20240130/27054a75/attachment.htm>