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From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3189) [drlvm][jit][opt] code patching works incorrectly on EM64T
Date Wed, 14 Mar 2007 13:47:09 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12480773
] 

Alexey Varlamov commented on HARMONY-3189:
------------------------------------------

Applied HARMONY-3189-version-3-SP1.patch at r518137 to address current performance degradation.
I suppose we should keep this issue open until full resolution.

> [drlvm][jit][opt] code patching works incorrectly on EM64T
> ----------------------------------------------------------
>
>                 Key: HARMONY-3189
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3189
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: EM64T
>            Reporter: George Timoshenko
>         Assigned To: Alexey Varlamov
>         Attachments: HARMONY-3189-version-3-SP1.patch, HARMONY-3189-version-3.patch,
HARMONY-3189.patch
>
>
> fixing HARMONY-2881  triggered a serious problem:
> code patching mecanizm can not work when the target addres of call instruction is 64
bit long. (such addresses appeares after fixing 2881)
> there is no CALL inst with 64-bit immediate operand on EM64T.
> So all direct calls are turned into:
> MOV a reg, immediate target addr;
> CALL the reg;
> this issue devoted to fixing code patching mecanizm on EM64T

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