RFR: 8375443: AVX-512: Disabling through UseSHA doesn't affect UseSHA3Intrinsics [v3]

[Manuel Hässig]

On Wed, 21 Jan 2026 12:32:12 GMT, Ramkumar Sunderbabu <rsunderbabu at openjdk.org> wrote:

>> test/hotspot/jtreg/compiler/arguments/TestUseSHA3IntrinsicsWithUseSHADisabled.java line 32:
>> 
>>> 30:  * @requires vm.flagless
>>> 31:  * @requires os.arch == "amd64" | os.arch == "x86_64"
>>> 32:  * @requires vm.cpu.features ~= ".*avx512f.*" & vm.cpu.features ~= ".*avx512bw.*"
>> 
>> It would be great to also test that the warning is emitted when `-XX:+UseSHA3Intrinsics` is passed, but is not supported by the CPU. You could remove this line and detect the features using `WHITE_BOX.getCPUFeatures()`.
>
> the properties are set already using WhiteBox.getCPUFeatures()
> https://github.com/openjdk/jdk/blob/983ae96f60c935aa52f482d21ae6a0d947679541/test/lib/jdk/test/whitebox/cpuinfo/CPUInfo.java#L53C39-L53C53

Right. But ideally, the test would not only run on machines where AVX512 is supported and check the warning on unsupported machines for complete coverage of the flag handling.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29266#discussion_r2712429391