RFR: 8319429: Resetting MXCSR flags degrades ecore [v2]

[Volodymyr Paprotski]

On Tue, 7 Nov 2023 02:52:46 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> Volodymyr Paprotski has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   move option to x86-specific section
>
> src/hotspot/cpu/x86/vm_version_x86.cpp line 862:
> 
>> 860:   // Check if processor has Intel Ecore
>> 861:   if (FLAG_IS_DEFAULT(DoEcoreOpt) && is_intel() && cpu_family() == 6 &&
>> 862:     (_model == 0x97 || _model == 0xAC || _model == 0xAF)) {
> 
> Model 0x97 corresponds to ADL Hybrid Core converged ISA target where DoEcodeOpt enabling will depend on the core over which VM initialization thread executes.

On hybrid platforms, it will be enabled on both Pcore and Ecore. Performance is essentially unchanged on Pcore

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PR Review Comment: https://git.openjdk.org/jdk/pull/16504#discussion_r1384293314