RFR: JDK-8298813: [C2] Converting double to float cause a loss of precision and resulting crypto.aes scores fluctuate

[SUN Guoyun]

On Tue, 20 Dec 2022 01:33:35 GMT, SUN Guoyun <duke at openjdk.org> wrote:

>> Tests passed and performance results looks good. I think the other change that you proposed should not be part of this.
>
> @TobiHartmann Thank you for your review. I have one more question for you, How did you test SPECjvm2008 performance?  take the maximum or average value of multiple test results?

> @sunny868 We take the average value of multiple test runs.

How many times do I need to run SPECjvm2008? And is this average from all jvm2008 benchmarks or a single one? 
Are there any documentation or websites about performance testing for my reference?

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PR: https://git.openjdk.org/jdk/pull/11685