RFR: 8214761: Bug in parallel Kahan summation implementation

Mon Apr 12 21:31:57 UTC 2021

On Mon, 12 Apr 2021 19:45:24 GMT, Ian Graves <igraves at openjdk.org> wrote:

> Fixes a bug where the compensated sum should be negated when added together in the merge step of a given collector. This impacts accuracy of parallel summations with Double streams and creates larger deviations from a standard sequential (ie non-parallel) compensated summation.

Duplicate of https://github.com/openjdk/jdk/pull/2988

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PR: https://git.openjdk.java.net/jdk/pull/3442