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Quick Lists
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Bug ID:
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6431242
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Votes
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0
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Synopsis
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Optimize Integer.reverseBytes()
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Category
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hotspot:compiler2
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Reported Against
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Release Fixed
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hs10(b03),
6u4(b03) (Bug ID:2171794)
, 7(b03) (Bug ID:2176732)
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State
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10-Fix Delivered,
request for enhancement
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Priority:
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3-Medium
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Related Bugs
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6431243
,
6482634
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6483694
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Submit Date
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27-MAY-2006
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Description
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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().
Posted Date : 2006-05-27 01:05:51.0
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Work Around
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N/A
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Evaluation
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This is a candidate for intrinsification.
Posted Date : 2006-05-30 22:12:10.0
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Comments
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PLEASE NOTE: JDK6 is formerly known as Project Mustang
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