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From "Ilya Berezhniuk (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5098) Support for uncompressed heap references in gc
Date Fri, 16 Nov 2007 00:58:43 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12542920

Ilya Berezhniuk commented on HARMONY-5098:

Now I see that obj_info is used for storing current representation of reference - i.e. raw
pointers for uncompressed mode.
We can compress these pointers, but we will be forced to do this even in uncompressed mode
- the strange situation.

Object layout can be changed so that obj_info will be raw pointer (it will require proper
alignment and padding).
On the other side, it is not good too. Such changes depreciate compressed vtables; also such
changes in object layout agreement will affect VM code essentially, and will also affect other

So I agree, using compression for these pointers is much easier to implement; we can check
performance penalty.

> Support for uncompressed heap references in gc
> ----------------------------------------------
>                 Key: HARMONY-5098
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5098
>             Project: Harmony
>          Issue Type: New Feature
>          Components: DRLVM
>            Reporter: Rana Dasgupta
>         Attachments: H5098.uncompRef.patch, uncompress.patch
> JIRA issue for gc changes to support uncompressed 64 bit references

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