RFR: 8320448: Accelerate IndexOf using AVX2 [v48]

[Scott Gibbons]

On Thu, 30 May 2024 06:23:05 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/String/IndexOf.java line 35:
> 
>> 33:  * @requires vm.cpu.features ~= ".*avx2.*"
>> 34:  * @requires vm.compiler2.enabled
>> 35:  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xcomp -XX:-TieredCompilation -XX:UseAVX=2 -XX:+UnlockDiagnosticVMOptions -XX:+EnableX86ECoreOpts IndexOf
> 
> Same here: why is the test AVX2 specific? Could other platforms not also be "tickled" in interesting ways with this test?

There are two test blocks, so all platforms will be able to take advantage of the test via the first block.  I'm told that's how this works.

> test/jdk/java/lang/StringBuffer/IndexOf.java line 188:
> 
>> 186:      }
>> 187: 
>> 188:  }
> 
> It looks like you just indented basically the whole file by 1 space. Why?

I hadn't noticed this.  It's most likely an artifact of my editor as it wasn't intentional.  I'll change this back.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1620669257
PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1620679629