On Fri, 8 Apr 2022 19:33:26 GMT, XenoAmess <d...@openjdk.java.net> wrote:
> 8284637: Improve String.join performance src/java.base/share/classes/java/lang/String.java line 3290: > 3288: value, > 3289: off << coder, > 3290: delimiterLengthWithCoder Is there any benefit to special casing short delimiters? 1..4 bytes? Arraycopy has a fixed overhead regardless of the delimiter length. I might expect a big payoff for coder = Latin1 and delimiter length == 1..2 compared to arraycopy. src/java.base/share/classes/java/lang/String.java line 3290: > 3288: value, > 3289: off << coder, > 3290: delimiterLengthWithCoder Is there any benefit to special casing short delimiters? 1..4 bytes? Arraycopy has a fixed overhead regardless of the delimiter length. I might expect a big payoff for coder = Latin1 and delimiter length == 1..2 compared to arraycopy. ------------- PR: https://git.openjdk.java.net/jdk/pull/8169
