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  1. JDK
  2. JDK-8176894

Provide specialized implementation for default methods putIfAbsent, computeIfAbsent, computeIfPresent, compute, merge in TreeMap

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      TreeMap doesn't have specialized implementation for methods putIfAbsent(), computeIfAbsent(), computeIfPresent(), compute(). Default implementation frequently leads to twice tree traversal, that hurts performance.

      Implementation: http://cr.openjdk.java.net/~skuksenko/corelibs/utils/8176894/webrev.00/

      Suggested implementation improve performance of all 4 operations within 40%-100% (than higher cost of compare operation than more performance boost).

      Note: some of these operations are used in new HttpClient (JEP-110, jdk.incubator.httpclient). Performance speedup for HTTP/2 requests are within 5%-15% (depends on size of HTTP headers)

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            tvaleev Tagir Valeev
            skuksenko Sergey Kuksenko
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