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Posted to commits@harmony.apache.org by "Aleksey Shipilev (JIRA)" <ji...@apache.org> on 2008/05/22 08:27:55 UTC

[jira] Closed: (HARMONY-5718) [classlib][luni][performance] j.u.IdentityHashMap ariphmetic improvements

     [ https://issues.apache.org/jira/browse/HARMONY-5718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Shipilev closed HARMONY-5718.
-------------------------------------

    Resolution: Duplicate

Duplicate of HARMONY-5771

> [classlib][luni][performance] j.u.IdentityHashMap ariphmetic improvements
> -------------------------------------------------------------------------
>
>                 Key: HARMONY-5718
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5718
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: Classlib
>            Reporter: Aleksey Shipilev
>         Attachments: cl-identityhashmap-rc1.patch, cl-identityhashmap-rc2.patch, cl-identityhashmap-rc3.patch, cl-identityhashmap-rc4.patch, cl-identityhashmap-rc5.patch
>
>
> Profiling and disassembly shows that much of the time on MT/ThreadLocalBench is spent on % and / operations in java.util.IdentityHashMap.(findIndex|getModuloHash). The dividers though are 2^k, so we can replace them with mask and shift operations.

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