RFR: 8328998: Encoding support for Intel APX extended general-purpose registers

[Steve Dohrmann]

On Mon, 15 Apr 2024 17:43:35 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> src/hotspot/cpu/x86/globals_x86.hpp line 236:
>> 
>>> 234:              "mitigations for the Intel JCC erratum")                       \
>>> 235:                                                                             \
>>> 236:   product(bool, UseAPX, false, EXPERIMENTAL,                                              \
>> 
>> Spacing to ``
>
> @steveatgh, do you plan to add code to `vm_version_x86.*` to check for presence of AVX and setting this flag accordingly?

Thanks @vnkozlov.  
Spacing fixed locally.
Regarding the UseAPX flag, yes, a subsequent PR (see JDK-8329030) will tie the logic of the flag in with querying the hardware features.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18476#discussion_r1567832686