[13] 8224539: C2 compilation fails during ArrayCopyNode optimizations with assert(i < _max) failed: oob: i=1, _max=1

Vladimir Ivanov vladimir.x.ivanov at oracle.com
Wed May 22 15:08:25 UTC 2019

> http://cr.openjdk.java.net/~thartmann/8224539/webrev.00/

Looks good.

Best regards,
Vladimir Ivanov

> The fix for JDK-8212243 [1] changed the implementation of the ArrayCopyNode optimizations to access
> the src/dst adr nodes to get the base:
> http://hg.openjdk.java.net/jdk/jdk/rev/e3d79743f57d#l10.10
> http://hg.openjdk.java.net/jdk/jdk/rev/e3d79743f57d#l10.23
> Now it can happen that either one is top if the array size is known and the offset is out of bounds.
> For example, with incremental inlining we might not know the constant array size once the
> ArrayCopyNode is created but only once we execute ideal transformations (see regression test). The
> ArrayCopyNode will eventually be removed because the range checks fail but control is still valid at
> the time when we hit the assert.
> Tested with regression test and relevant tiers (running).
> Thanks,
> Tobias
> [1] https://bugs.openjdk.java.net/browse/JDK-8212243

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