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From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5464) [drlvm] vm helper improvement for better performance
Date Thu, 07 Feb 2008 09:45:08 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566522#action_12566522
] 

Alexey Varlamov commented on HARMONY-5464:
------------------------------------------

Maksim, are you sure the patch is workable? 
I've got an assertion on HelloWorld: 
Exception raised while initializing helper class org/apache/harmony/drlvm/VMHelper

> [drlvm] vm helper improvement for better performance
> ----------------------------------------------------
>
>                 Key: HARMONY-5464
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5464
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: Hope it works everywhere
>            Reporter: Maksim Ananjev
>            Assignee: Alexey Varlamov
>            Priority: Minor
>         Attachments: HARMONY_5464.patch
>
>
> The issue deals with "load interface vtable support".  Returning zero address and not
generating NPE if the object is null is safe in terms of preserving program semantics(the
exception will be generatedon the first method invocation) and allows profitable code transformations
such as hoisting vm helper outside the loop body. This is our current convention which touches
all variants of this helper. If it changes, all variants must be fixed
> The patch also includes osr_path enabling because it depends on this feature.

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