RFR: 8372685: C2 SuperWord: wrong requires in test after JDK-8371146

[Matthias Baesken]

On Fri, 28 Nov 2025 08:25:20 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> @MBaesken Thanks for the additional information!
>> 
>> I leave it up to you if you want to file an RFE for the error message. I don't have the expertise on Windows nor on GC.
>> 
>> Can you confirm that this change fixes your issue though? Because I could not reproduce the issue on my machine, so I'm relying on you here ;)
>
>> I leave it up to you if you want to file an RFE for the error message. I don't have the expertise on Windows nor on GC.
> 
> @xmas92 , @jsikstro  what do you think ?
> Is this about the 'ZGC requires Windows version 1803 or later'  message that surprised us a little bit because we see it on Windows server 2016 , but the 1803 looks like it refers to some update of good old Win 10 .

> @MBaesken 1803 seems to refer to both a Windows 10 and Windows Server 2016 (internal) release number/version. Here's a version list of the old semi-annual releases of Windows Server 2016: https://en.wikipedia.org/wiki/Windows_Server#Semi-Annual_releases_(discontinued)

Thanks !
The wikipedia says 'semi-annual releases do not include any desktop environments. Instead, they are restricted to the Nano Server configuration installed in a [Docker](https://en.wikipedia.org/wiki/Docker_(software)) [container](https://en.wikipedia.org/wiki/Containerization_(computing)),[[17]](https://en.wikipedia.org/wiki/Windows_Server#cite_note-thomasmaurer-17)[[29]](https://en.wikipedia.org/wiki/Windows_Server#cite_note-:0-29) and the Server Core configuration, licensed only to serve as a container host'   so this sounds like it is a rather special  'flavor' of  Win Server 2016 .
So maybe it is no wonder what we get the warning and have no VirtualAlloc2 on our Win Server 2016 test machine.

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PR Comment: https://git.openjdk.org/jdk/pull/28537#issuecomment-3588687610