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Quick Lists
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Bug ID:
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6752257
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Votes
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0
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Synopsis
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Use NOT instead of XOR -1 on x86
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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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hs14(b06)
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State
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10-Fix Delivered,
request for enhancement
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Priority:
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4-Low
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Related Bugs
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Submit Date
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24-SEP-2008
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Description
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On x86, use NOT instead of XOR -1 when possible.
XOR reg, -1 is 3 bytes, while NOT reg is 2 bytes. Both are 1 cycle. Don't expect earth shattering gains but it is smaller code.
Posted Date : 2008-09-24 21:33:43.0
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Work Around
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N/A
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Evaluation
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Give it a try.
Posted Date : 2008-09-24 21:33:43.0
http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/b744678d4d71
Posted Date : 2008-10-10 19:26:35.0
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Comments
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PLEASE NOTE: JDK6 is formerly known as Project Mustang
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