RFR: 8320448: Accelerate IndexOf using AVX2 [v48]

[Volodymyr Paprotski]

On Thu, 30 May 2024 13:56:30 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Control question: Are we confident with this potentially going into JDK 23 or should we rather postpone to JDK 24? The fork is next week.
>
>> Control question: Are we confident with this potentially going into JDK 23 or should we rather postpone to JDK 24? The fork is next week.
> 
> I would hold off. @asgibbons it may pass our tests, and your extensive testing. But you never know what the fuzzer can find over a few weeks once it runs with your changes. I have made that experience many times. Let's just give it a few days, and then we have one JDK version less to worry about for backports on possible follow-up bugs ;)

@eme64 I guess to add some confidence.. we did also 'test it independently' to catch blind spots. i.e. `String/IndexOf.java` is from me. I tried to be as paranoid as possible with non-random strings. Passed everything I could throw at it..

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PR Comment: https://git.openjdk.org/jdk/pull/16753#issuecomment-2139882544