RFR: 8287794: Reverse*VNode::Identity problem [v4]

[Jatin Bhateja]

On Thu, 28 Jul 2022 07:20:51 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> I am not clear, if UseSVE=0 then why does "sve" feature getting populated during VM initialization?
>> Entire handling of applyIfCPUFeature* is based on white box CPU feature API which queries the feature list populated during VM initialization, we are not directly queries the target features seen in /proc/cpuinfo.
>
> Yeah, that's the difference from X86. `UseSVE` is a vm flag which lets user to choose whether use the sve feature or not. And the sve cpu feature is still there that will not been influenced by the VM flag.

I think we should not be enabling sve feature if user explicitly passes VM flag UseSVE = 0, may be it should be fixed separately.
  
Option 1 seems like a good interim solution to me, will update the patch.

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PR: https://git.openjdk.org/jdk/pull/9623