| Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
|---|---|---|---|---|---|---|
| JDK-2176732 | 7 | Yumin Qi | P3 | Closed | Fixed | b03 |
| JDK-2171794 | 6u4 | Yumin Qi | P3 | Resolved | Fixed | b03 |
Integer.reverseBytes() implements endianness conversion as:
public static int reverseBytes(int i) {
return ((i >>> 24) ) |
((i >> 8) & 0xFF00) |
((i << 8) & 0xFF0000) |
((i << 24));
}
Some architectures include instructions that do just that: BSWAP on x86 and LDUWA on SPARC, but HotSpot currently does not take advantage of them.
Similarly for Long.reverseBytes().
public static int reverseBytes(int i) {
return ((i >>> 24) ) |
((i >> 8) & 0xFF00) |
((i << 8) & 0xFF0000) |
((i << 24));
}
Some architectures include instructions that do just that: BSWAP on x86 and LDUWA on SPARC, but HotSpot currently does not take advantage of them.
Similarly for Long.reverseBytes().
- backported by
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JDK-2171794 Optimize Integer.reverseBytes()
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- Resolved
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- Closed
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- relates to
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JDK-6483694 nightly failure after 6431242 putback
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- Resolved
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-
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- Closed
-
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JDK-6431243 Optimize Integer.rotateLeft()
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- Resolved
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- Closed
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(1 relates to)