RFR: 8341697: C2: Register allocation inefficiency in tight loop [v6]

[Vladimir Kozlov]

On Mon, 14 Oct 2024 13:42:45 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

>> Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   refine comments + typo
>
> Thanks for the source code. That's really interesting, running the benchmark multiple times may give different results, and even when there is a difference in the observed throughputs, the 2 compiled methods are exactly the same. So I think we are running into different quirks here, probably due to the fact that this benchmark saturates the memory bandwidth.

@merykitty can you run this with regular Java benchmarks (SPECjvm, SPECjbb, Renaissance, DaCapo) to see if they are affected?

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

PR Comment: https://git.openjdk.org/jdk/pull/21472#issuecomment-2414619344