[Ping] RFR: 8176894 Provide specialized implementation for default methods putIfAbsent, computeIfAbsent, computeIfPresent, compute, merge in TreeMap
amaembo at gmail.com
Mon Jul 29 16:11:38 UTC 2019
A gentle reminder: please review the changeset and the CSR. Thanks!
With best regards,
On Mon, Jul 15, 2019 at 5:58 PM Tagir Valeev <amaembo at gmail.com> wrote:
> Please review the following patch:
> Also please review the associated CSR:
> The patch was originally submitted by Sergey Kuksenko in March 2017 and
> reviewed by some people:
> The latest patch submitted by Sergey is here:
> I asked Sergey why it was abandoned. Seems there were no particular reason
> and Sergey asked if I could pick up this work. I will be happy to finish it.
> Here's the list of differences between the latest Sergey patch and my
> - A bug is fixed in putIfAbsent implementation. TreeMap.java, lines 576
> and 596: `|| oldValue == null` condition added (the null value should be
> overwritten no matter what)
> - A testcase is added to cover this problem (InPlaceOpsCollisions.java,
> also checks HashMap and LinkedHashMap). Not sure if it's the best place for
> such test though. Probably a separate file would be better?
> - TreeMap.merge() implementation is added.
> - TreeMap is added to the FunctionalCMEs.java test (btw this file
> copyright says that it's a subject to Classpath exception which is probably
> - Simple microbenchmark is added: TreeMapUpdate.java
> My quick benchmarking shows that optimized version is indeed faster for
> the most of the tests and no regression is observed for put() method.
> Here's raw results of jdk13-ea+26 and jdk13-ea+26+patch if anybody is
> With best regards,
> Tagir Valeev.
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