JDK-8282429 accidentally removed an optimization (JDK-8240094) that ensured StringBuilder/StringBuffer::toString returns `""` when the builders are empty.
Name Cnt Base Error Test Error Unit Change StringBuffers.emptyToString 5 12,289 ± 0,384 9,883 ± 0,721 ns/op 1,24x (p = 0,000*) :gc.alloc.rate 1862,398 ± 57,647 0,007 ± 0,000 MB/sec 0,00x (p = 0,000*) :gc.alloc.rate.norm 24,000 ± 0,000 0,000 ± 0,000 B/op 0,00x (p = 0,000*) :gc.count 31,000 0,000 counts :gc.time 21,000 ms StringBuilders.emptyToString 5 4,146 ± 0,567 0,646 ± 0,003 ns/op 6,42x (p = 0,000*) :gc.alloc.rate 9208,656 ± 1234,399 0,007 ± 0,000 MB/sec 0,00x (p = 0,000*) :gc.alloc.rate.norm 40,000 ± 0,000 0,000 ± 0,000 B/op 0,00x (p = 0,000*) :gc.count 96,000 0,000 counts :gc.time 64,000 ms * = significant ------------- Commit messages: - Copyrights - 8325730: StringBuilder.toString allocation for the empty String Changes: https://git.openjdk.org/jdk/pull/17931/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17931&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8325730 Stats: 53 lines in 5 files changed: 14 ins; 31 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/17931.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17931/head:pull/17931 PR: https://git.openjdk.org/jdk/pull/17931
