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From "Maksim Ananjev (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5464) [drlvm] vm helper improvement for better performance
Date Thu, 07 Feb 2008 10:05:08 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566535#action_12566535
] 

Maksim Ananjev commented on HARMONY-5464:
-----------------------------------------

Alexey.

I have solid level of confidence about this patch. I tested in debug and release mode on Apache
Xerces J, Linux 32 bit. –°ould you please provide more details on the assertion i.e. platform
and command line? 

> [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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