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From "Pavel Ozhdikhin (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5515) [drlvm][jit][opt] Devirtualization should be reverted in case direct call was not inlined
Date Thu, 14 Feb 2008 14:21:08 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-5515?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pavel Ozhdikhin updated HARMONY-5515:
-------------------------------------

    Attachment: undevirt.patch

The patch passed "ant test" on Windows/IA32 debug build.

> [drlvm][jit][opt] Devirtualization should be reverted in case direct call was not inlined
> -----------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5515
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5515
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Pavel Ozhdikhin
>            Priority: Minor
>         Attachments: undevirt.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> The devirtualization optimization in Jitrino.OPT JIT compiler makes sense only if the
de-virtualized call is inlined. Otherwise it adds unnecessary overhead to a virtual call.
Direct call may not be inlined in case of it's large size, exhausted inlining bufget etc.
> The attached patch introduces a new optimization pass - undevirt, which removes direct
call branch in case the direct call was not inlined.

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