> This PR addresses a performance degradation when constructing a new 
> MessageFormat that contains a subformat with a pattern that is not a 
> predefined style. This is due to internal logic which catches an IAE 
> specifically for subformat patterns. Perf tests for choice and number are not 
> grouped, since performance is directly tied to subformat creation.
> 
> M1 Mac - Perf (before):
> 
> 
> MessageFormatterBench.testSubformatChoice  thrpt   15   865.430 ±  6.766  
> ops/ms
> MessageFormatterBench.testSubformatNumber  thrpt   15  1021.808 ± 11.413  
> ops/ms
> 
> 
> M1 Mac - Perf (after):
> 
> 
> Benchmark                                   Mode  Cnt     Score    Error   
> Units
> MessageFormatterBench.testSubformatChoice  thrpt   15  1671.033 ± 55.012  
> ops/ms
> MessageFormatterBench.testSubformatNumber  thrpt   15  3275.727 ± 47.370  
> ops/ms

Justin Lu has updated the pull request incrementally with one additional commit 
since the last revision:

  Reflect suggestions from Naoto & Chen

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28806/files
  - new: https://git.openjdk.org/jdk/pull/28806/files/8eea336f..e56ffa12

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28806&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28806&range=01-02

  Stats: 8 lines in 1 file changed: 2 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/28806.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28806/head:pull/28806

PR: https://git.openjdk.org/jdk/pull/28806

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