tree a55c36452f8f6b28c40f6c72c435dd788b29b5dc
parent 91a16c9d16178428fdbf405fb62fc953e9a28fa3
author Nikita Iashchenko <nikitai@google.com> 1634571851 +0100
committer Nikita Iashchenko <nikitai@google.com> 1634728850 +0000

OpenJDK 11: Add String.repeat()

Add native implementation for java.lang.String#repeat().

This implementation is 4.7-40.9 times faster (depending on how large
result string is) than naive StringBuilder implementation.

| Test             | Java, ns   | ART, ns    |  Gain |
|------------------+------------+------------+-------|
| len:1  reps:1m   | 15,553,793 | 379,730    | 40.96 |
| len:13 reps:10   | 724        | 154        |   4.7 |
| len:13 reps:100k | 7,099,111  | 553,559 ns | 12.82 |

Bug: 202962059
Test: atest CtsLibcoreOjTestCases:test.java.lang.String.StringRepeat
Test: atest LibcoreBenchmarkTests:libcore.benchmark.StringTest
Change-Id: I6535bb9201c14c455f0b13988e034919049e1222