This PR changes the implementation of `Long.toUnsignedString(long, int)` for "default" radices, which avoids creating a `BigInteger` and makes use of `Long.divideUnsigned` and `Long.remainderUnsigned`.
I've run the test on `test/jdk/java/lang/Long/Unsigned.java` and it works correctly. I believe that there is no need to add more test cases. I've add a benchmark case to `test/micro/org/openjdk/bench/java/lang/Longs.java` for this method. Here is the benchmark result tested on my machine: Before (JDK 20.0.1): Benchmark (size) Mode Cnt Score Error Units Longs.toUnsignedStringNegative 500 avgt 15 6428.711 ± 63.142 us/op After: Benchmark (size) Mode Cnt Score Error Units Longs.toUnsignedStringNegative 500 avgt 15 3823.655 ± 146.171 us/op I've submitted a bug report for this to the [Java Bug Database](https://bugs.java.com/bugdatabase/). No CSR needed since the behavior is not changed. ------------- Commit messages: - Typo: indices -> radices - Merge branch 'optimize-unsigned-string' of https://github.com/yuantj/jdk-pr into optimize-unsigned-string - Merge branch 'openjdk:master' into optimize-unsigned-string - Merge branch 'openjdk:master' into optimize-unsigned-string - Add benchmark - Update Long.java Changes: https://git.openjdk.org/jdk/pull/14654/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14654&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8311009 Stats: 21 lines in 2 files changed: 20 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/14654.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14654/head:pull/14654 PR: https://git.openjdk.org/jdk/pull/14654
