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From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-5040) [drlvm] Java field ordering must be preserved
Date Mon, 29 Oct 2007 14:42:50 GMT
[drlvm] Java field ordering must be preserved
---------------------------------------------

                 Key: HARMONY-5040
                 URL: https://issues.apache.org/jira/browse/HARMONY-5040
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
            Reporter: Aleksey Shipilev


Current implementation of class support in Harmony sorts the class fields decrementally by
size to avoid misalignment. However, it's done with quicksort which is known to be unstable
(e.g. there are no guarantees that order of elements with equal keys will not be changed).
That lead to shaking Java field order which could be optimized to achieve the spatial locality.


Proposed patch changes the sorting algorithm to bubblesort, which is known to be stable. That's
performance-safe since average field count is not high.

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