| Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
|---|---|---|---|---|---|---|
| JDK-8178210 | 10 | Martin Doerr | P2 | Resolved | Fixed | b04 |
We have observed that C2 generates implicit null checks for write accesses to the heap base even though it was not protected (narrow_oop_use_implicit_null_checks = false).
The problem showed up on AIX with -XX:HeapBaseMinAddress=32g. ReservedHeapSpace::establish_noaccess_prefix protects the base area on almost all platforms, but not on AIX (in some case).
PhaseCFG::implicit_null_check needs to skip the transformation in this case.
The problem showed up on AIX with -XX:HeapBaseMinAddress=32g. ReservedHeapSpace::establish_noaccess_prefix protects the base area on almost all platforms, but not on AIX (in some case).
PhaseCFG::implicit_null_check needs to skip the transformation in this case.
- backported by
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JDK-8178210 C2: Invalid ImplicitNullChecks with non-protected heap base
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- Resolved
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