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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2014/07/29 18:33:39 UTC

[jira] [Created] (LUCENE-5856) remove useless & 0x3f from *BitSet.get and company

Robert Muir created LUCENE-5856:
-----------------------------------

             Summary: remove useless & 0x3f from *BitSet.get and company
                 Key: LUCENE-5856
                 URL: https://issues.apache.org/jira/browse/LUCENE-5856
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Robert Muir


java specification says:

{quote}
If the promoted type of the left-hand operand is long, then only the six lowest-order bits of the right-hand operand are used as the shift distance. It is as if the right-hand operand were subjected to a bitwise logical AND operator & (§15.22.1) with the mask value 0x3f (0b111111). The shift distance actually used is therefore always in the range 0 to 63, inclusive.
{quote}

and x86 works the same way.

if we remove this, we just see less instructions with printassembly...



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