RFC (S) 8076758: new StringBuilder().append(String).toString() should be recognized by OptimizeStringConcat

Aleksey Shipilev aleksey.shipilev at oracle.com
Fri Aug 28 10:12:20 UTC 2015


I would like to see this one fixed, because it touches on pending String
improvements in JDK:

Here is a proof-of-concept patch:

It passes JPRT and fixes the performance issues in microbenchmarks, but
I'm not sure the code change is completely correct, given the history of
OptimizeStringConcat bugs. Could anyone from a compiler team chime in?


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