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Enhancement
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Resolution: Fixed
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P4
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None
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b15
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x86
| Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
|---|---|---|---|---|---|---|
| JDK-8006494 | 8 | Vladimir Kozlov | P4 | Resolved | Fixed | b74 |
| JDK-8017872 | 7u45 | Vladimir Kozlov | P4 | Closed | Fixed | b01 |
| JDK-8006378 | 7u40 | Vladimir Kozlov | P4 | Closed | Fixed | b10 |
| JDK-8006057 | hs24 | Vladimir Kozlov | P4 | Resolved | Fixed | b29 |
New x86 processors enhanced the operation of the REP MOVSB and REP STOSB instructions. A processors supports these enhancements if CPUID.(EAX=07H, ECX=0H):EBX[bit 9] is 1 (ERMS bit). VM uses stosq/stosd instructions to zero new java objects, replace them with fast-string stosb instructions when they are available. Note: we can't use REP MOVSB for arraycopy because it is not JMM compliant (not atomic and out of order).
- backported by
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JDK-8006057 use fast-string instructions on x86 for zeroing
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- Resolved
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- Resolved
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- Closed
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- Closed
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- relates to
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- Resolved
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