[jira] Updated: (XERCESJ-1464) SymbolTable.hash uses only 27 bits, when 31 are available

["Michael Glavassevich (JIRA)" <xe...@xml.apache.org>]

     [ https://issues.apache.org/jira/browse/XERCESJ-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Glavassevich updated XERCESJ-1464:
------------------------------------------

    Component/s: Other

> SymbolTable.hash uses only 27 bits, when 31 are available
> ---------------------------------------------------------
>
>                 Key: XERCESJ-1464
>                 URL: https://issues.apache.org/jira/browse/XERCESJ-1464
>             Project: Xerces2-J
>          Issue Type: Improvement
>          Components: Other
>    Affects Versions: 2.10.0
>         Environment: any
>            Reporter: Roland Illig
>            Priority: Minor
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> The hash(...) functions mask out the five most significant bits. The usual approach is to only mask out the sign bit.
> This naturally raises the question whether the omission of one F in 0x7FF_FFFF was intentional or accidental.
> Even if it is changed to 0x7FFF_FFFF there shouldn't be large performance improvements since the distribution of the entries wouldn't be much better than now.
> In fact, I'm just curious why you chose 0x7FF_FFFF.

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