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

[Vladimir Ivanov]

Looks good.

Best regards,
Vladimir Ivanov

On 4/21/15 4:02 PM, Roland Westrelin wrote:
> http://cr.openjdk.java.net/~roland/8076188/webrev.00/
>
> 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
>
> Roland.
>