[FFM performance] Intermediate buffer allocation when returning structs

[Matthias Ernst]

Disabling the intrinsics appears to both fix the scalar replacement and the
crasher:

java -XX:DisableIntrinsic=_Continuation_pin --add-opens
java.base/jdk.internal.misc=ALL-UNNAMED --add-opens
java.base/jdk.internal.vm=ALL-UNNAMED -Xlog:gc Repro
[0.078s][info][gc] Using G1
################# Expect allocations #################
################# Expect silence(release) or crash(fastdebug)
#################
################# Done. #################


On Fri, Jan 17, 2025 at 3:10 PM Alan Bateman <alan.bateman at oracle.com>
wrote:

> On 17/01/2025 13:48, Maurizio Cimadamore wrote:
> >
> > Thanks Matthias, adding loom-dev
> >
> The intrinsics for pin/unpin are new in JDK 24. Can you do a quick test
> with -XX:DisableIntrinsic=_Continuation_pin to see if it reproduces?
>
> -Alan
>
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