RFR: 8351994: Enable Extended EVEX to REX2/REX demotion when src and dst are the same [v22]

[Srinivas Vamsi Parasa]

On Wed, 21 May 2025 18:26:40 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Srinivas Vamsi Parasa has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix for UseAddressNop related failure
>
> src/hotspot/cpu/x86/vm_version_x86.cpp line 1635:
> 
>> 1633:       UseStoreImmI16 = false; // don't use it on Intel cpus
>> 1634:     }
>> 1635:     if (cpu_family() == 6 || cpu_family() == 15 || cpu_family() == 18 || cpu_family() == 19) {
> 
> This could be written as if (is_P6_or_later() || cpu_family() == 15)

This got fixed as well.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24431#discussion_r2101360424