RFR: 8320448: Accelerate IndexOf using AVX2 [v48]

[Emanuel Peter]

On Thu, 30 May 2024 06:21:36 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Scott Gibbons has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove duplicate vm.compiler2.enabled
>
> test/jdk/java/lang/StringBuffer/ECoreIndexOf.java line 29:
> 
>> 27:  * @requires vm.cpu.features ~= ".*avx2.*"
>> 28:  * @requires vm.compiler2.enabled
>> 29:  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+EnableX86ECoreOpts -XX:UseAVX=2 -Xbatch -XX:-TieredCompilation -XX:CompileCommand=dontinline,ECoreIndexOf.indexOfKernel ECoreIndexOf
> 
> Does this test really need to be `avx2` specific? Does it even need to be C2 specific?
> Or can this run on all platforms?

Would be a shame to spend so much time on writing a test and then not apply it everywhere ;)

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PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1620017891