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From "Mikhail Fursov (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5743) [drlvm][jit][opt] Lazy reference compression/uncompression in Jitrino.OPT compiler
Date Sat, 19 Apr 2008 13:42:23 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-5743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Mikhail Fursov updated HARMONY-5743:

    Summary: [drlvm][jit][opt] Lazy reference compression/uncompression in Jitrino.OPT compiler
 (was: [drlvm][jit][opt])

> [drlvm][jit][opt] Lazy reference compression/uncompression in Jitrino.OPT compiler
> ----------------------------------------------------------------------------------
>                 Key: HARMONY-5743
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5743
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: EM64T
>            Reporter: George Timoshenko
>            Assignee: Mikhail Fursov
>            Priority: Minor
>         Attachments: autocompress_proto_21_Jan.patch
> In compressed mode OPT always uncompress a ref just after it is loaded from memory (from
> So each reference is uncompressed in the managed code.
> It is a convention in HLO. There are not dedicated instructions for compression/uncompression.
> IRBuilder generates LdField and its dst operand has type - UncompressedRef.
> It probably has sense not to uncompress ref if it is loaded just for NULL comparison
or storing to another field.
> To do this we need to generate Compress/Uncompress instructions explicitly during byte
code translation.

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