JDK-6431242 : Optimize Integer.reverseBytes()
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 6
- Priority: P3
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2006-05-27
- Updated: 2010-04-03
- Resolved: 2006-11-14
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 6 | JDK 7 | Other |
|---|---|---|
6u4Fixed  |
7Fixed |
hs10Fixed |
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Description
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().
Comments
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