RFR: 8356709: Avoid redundant String formatting in BigDecimal.valueOf(double) [v4]

[Raffaello Giulietti]

On Wed, 14 May 2025 14:39:37 GMT, Johannes Graham <duke at openjdk.org> wrote:

>> Optimize `BigDecimal.valueOf(double)` by using `FormattedFPDecimal` instead of converting to decimal string and then parsing it. This results in an approximate 6x improvement for me.
>
> Johannes Graham has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - Update src/java.base/share/classes/jdk/internal/math/FormattedFPDecimal.java
>    
>    Align better with spec
>    
>    Co-authored-by: Raffaello Giulietti <raffaello.giulietti at oracle.com>
>  - Update src/java.base/share/classes/jdk/internal/math/FormattedFPDecimal.java
>    
>    Better alignment with spec
>    
>    Co-authored-by: Raffaello Giulietti <raffaello.giulietti at oracle.com>
>  - Update src/java.base/share/classes/jdk/internal/math/FormattedFPDecimal.java
>    
>    Add another final
>    
>    Co-authored-by: Raffaello Giulietti <raffaello.giulietti at oracle.com>

Marked as reviewed by rgiulietti (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25173#pullrequestreview-2844337861