RFR: 8301958: Reduce Arrays.copyOf/-Range overheads [v9]
Claes Redestad
redestad at openjdk.org
Wed Feb 8 10:53:22 UTC 2023
> This patch adds special-cases to `Arrays.copyOf` and `Arrays.copyOfRange` to clone arrays when `newLength` or range inputs span the input array. This helps eliminate range checks and has been verified to help various String operations. Example:
>
> Baseline
>
> Benchmark (size) Mode Cnt Score Error Units
> StringConstructor.newStringFromArray 7 avgt 15 16.817 ± 0.369 ns/op
> StringConstructor.newStringFromArrayWithCharset 7 avgt 15 16.866 ± 0.449 ns/op
> StringConstructor.newStringFromArrayWithCharsetName 7 avgt 15 22.198 ± 0.396 ns/op
>
> Patch:
>
> Benchmark (size) Mode Cnt Score Error Units
> StringConstructor.newStringFromArray 7 avgt 15 14.666 ± 0.336 ns/op
> StringConstructor.newStringFromArrayWithCharset 7 avgt 15 14.582 ± 0.288 ns/op
> StringConstructor.newStringFromArrayWithCharsetName 7 avgt 15 20.339 ± 0.328 ns/op
Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
Add offset param to micro, reduce number of configurations and variants
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/12453/files
- new: https://git.openjdk.org/jdk/pull/12453/files/85b50169..350612d4
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=12453&range=08
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=12453&range=07-08
Stats: 13 lines in 1 file changed: 6 ins; 4 del; 3 mod
Patch: https://git.openjdk.org/jdk/pull/12453.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/12453/head:pull/12453
PR: https://git.openjdk.org/jdk/pull/12453
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