Hi Claes,
yes please. Thumbs up. :-)
Best,
Michael
Am 28.09.2016 um 13:48 schrieb Claes Redestad
<claes.redes...@oracle.com>:
Hi,
as discussed recently on hotspot-compiler-dev[1], having a private
class with no default constructor can lead to C2 failing to inline, due
to the synthetic bridge constructor using a dummy argument of an
uninitialized class. This is really a problem in C2, as well as
something which could ultimately be resolved by nestmates...
However, there is an easy workaround in adding an empty
package-private constructor. In the most recently found case - a
microbenchmark stressing MethodHandles.iteratedLoop - adding this to
ArrayList$Itr lead to a 2.5-3x speedup.
This is me asking nicely to do a quick-fix for this in
java.util.ArrayList$Itr now:
Bug: https://bugs.openjdk.java.net/browse/JDK-8166840
Webrev: http://cr.openjdk.java.net/~redestad/8166840/webrev.01/
Thanks!
/Claes
[1]
http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-September/024407.html
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