RFR: 8320448: Accelerate IndexOf using AVX2 [v34]

[Vladimir Kozlov]

On Thu, 23 May 2024 21:50:15 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Scott Gibbons has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Addressing review comments
>
> src/hotspot/cpu/x86/stubGenerator_x86_64.cpp line 4250:
> 
>> 4248:   generate_chacha_stubs();
>> 4249: 
>> 4250:   if ((UseAVX == 2) && EnableX86ECoreOpts && VM_Version::supports_avx2()) {
> 
> `#ifdef COMPILER2` around this code to exclude JVMCI only case.

You don't need to check `VM_Version::supports_avx2()` because we reset `UseAVX` if avx2 is not supported.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1612361847