RFR: 8315585: Optimization for decimal to string

[Johannes Graham]

On Mon, 27 Jan 2025 06:03:17 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> src/java.base/share/classes/java/math/BigDecimal.java line 3538:
>> 
>>> 3536:             return (signum < 0 ? "-0." : "0.").concat(intString);
>>> 3537:         } else if (insertionPoint > 0) { /* Point goes inside intVal */
>>> 3538:             buf = new StringBuilder();
>> 
>> Could calculate the precise size for the StringBuilder
>
> The performance will degrade if you precompute the length of the StringBuilder.

That’s interesting  - should the precomputed lengths be removed in the other ones as well?

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PR Review Comment: https://git.openjdk.org/jdk/pull/23310#discussion_r1930371369