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phases: improve performance of _retractboundary
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Authored by joerg.sonnenberger on Jun 18 2020, 4:23 PM.

Details

Summary

The old version repeatedly converts nodes to revisions, which is a
moderately expensive operation. Mapping all new changes once to
revisions and back at the end reduces the time spend in _retractboundary
during the unbundling of NetBSD's src from 67s to 17s.

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