RFR: 8334328: Reduce object allocation for FloatToDecimal and DoubleToDecimal [v8]

[Shaojin Wen]

On Sun, 16 Jun 2024 23:49:18 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> src/java.base/share/classes/jdk/internal/math/ToDecimal.java line 169:
>> 
>>> 167:     }
>>> 168: 
>>> 169:     /* Using the deprecated constructor enhances performance */
>> 
>> Enhances performance over what, `new String(str, 0, index, StandardCharsets.US_ASCII)`? Please specify.
>
> The previous version of the code is like this, which will affect Float.toString and Double.toString. If changed, it is necessary to add the Benchmark of Float.toString and Double.toString, so I don’t want to change this in this PR.

I followed your suggestion and changed it, but Coding uses ISO_8859_1. The performance of ISO_8859_1 is faster than that of the previously abandoned method.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19730#discussion_r1642037877