RFR: 8339290: Optimize ClassFile Utf8EntryImpl#writeTo [v8]

[Claes Redestad]

On Mon, 2 Sep 2024 15:27:59 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> Use fast path for ascii characters 1 to 127 to improve the performance of writing Utf8Entry to BufferWriter.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   typo

src/java.base/share/classes/java/lang/StringCoding.java line 39:

> 37: class StringCoding {
> 38:     private static final Unsafe UNSAFE = Unsafe.getUnsafe();
> 39:     private static final long POSITIVE_MASK = 0b1000000_1000000_1000000_1000000_1000000_1000000_1000000_1000000L;

Shouldn't this be `0b10000000_10000000_10000000_10000000_10000000_10000000_10000000_10000000L`? Either way this new method needs a sanity test.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20772#discussion_r1741141281