Hi,
this patch optimizes setup of the default strategy for indified String
concat to setup and use fewer intermediary MHs when some arguments are
non-char primitives.
Webrev: http://cr.openjdk.java.net/~redestad/8212597/jdk.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8212597
I've cleaned up of the associated StringConcatHelper to remove the
mixCoder methods no longer in use, along with a small adjustment to the
HelloClasslist tool to exercise more concatenation shapes. With the fix
to https://bugs.openjdk.java.net/browse/JDK-8212201 in place this build
tool always emit the latest bytecode, which ensures ISC is exercised and
part of the feedback loop. This makes sure that input to jlink is kept
relevant and up-to-date, and by adding a number of common concatenation
shapes we reduce the startup overhead in a few common cases.
Testing: ran all String tests locally, sanity JDK tier 1+2 testing on
primary platforms
Thanks!
/Claes
