RFR(M): 8076188 Optimize arraycopy out for non escaping destination

Roland Westrelin roland.westrelin at oracle.com
Tue Apr 21 13:02:13 UTC 2015


This patch tries to eliminate ArrayCopyNodes (for instance clones, array clones, arraycopy and copyOf) when the destination of the copy doesn’t escape:

- during escape analysis, ArrayCopyNodes don’t cause the destination of the copy to be marked as escaping anymore
- a load to the destination of a copy may be replaced by a load from the source during IGVN
- during macro expansion, ArrayCopyNodes don’t stop allocation from being eliminated and can themselves be eliminated 


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