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Enhancement
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Resolution: Withdrawn
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P4
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8-shenandoah, 11-shenandoah, 12, 13
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generic
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generic
Currently, object arraycopies requires up to 3 scans of the array:
1. Pre-barrier scans the dst array for SATB
2. Actual copy (using blit transfer)
3. Post-barrier scans the dst array again to update any from-space refs to to-space
This can be folded into a single loop which does the above per-element, and ensures to-space invariant before actually storing the object into the dst array. The latter would help other code that currently needs to deal with (temporary) from-space refs in arrays. SeeJDK-8222766.
1. Pre-barrier scans the dst array for SATB
2. Actual copy (using blit transfer)
3. Post-barrier scans the dst array again to update any from-space refs to to-space
This can be folded into a single loop which does the above per-element, and ensures to-space invariant before actually storing the object into the dst array. The latter would help other code that currently needs to deal with (temporary) from-space refs in arrays. See
- is blocked by
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- Closed
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- relates to
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- Closed
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JDK-8223244 Fix usage of ARRAYCOPY_DISJOINT decorator
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- Resolved
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