RFR: 8367780: Enable UseAPX on Intel CPUs only when both APX_F and APX_NCI_NDD_NF cpuid features are present [v4]

[Jatin Bhateja]

On Thu, 25 Sep 2025 00:45:37 GMT, Srinivas Vamsi Parasa <sparasa at openjdk.org> wrote:

> > EMR>sde64 -dmr -ptr_raise -- java -XX:+PrintFlagsFinal -XX:+UnlockExperimentalVMOptions -XX:+UseAPX --version | grep APX
> > OpenJDK 64-Bit Server VM warning: UseAPX is not supported on this CPU, setting it to false
> 
> Hi Jatin,
> 
> Thank for informing about this issue! Sorry about the SDE issue. Will inform you once the public version of SDE which supports this feature is avalible.
> 
> Thanks, Vamsi

Thanks @vamsi-parasa, BTW, there should not be any urgency to push a patch for future enhancement in the absence of software emulation :-)

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PR Comment: https://git.openjdk.org/jdk/pull/27320#issuecomment-3335233685