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From "Xiaoming Gu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-6024) [drlvm][jit] Incorrect generated instruction in peephole opt for MOV
Date Thu, 20 Nov 2008 05:18:44 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-6024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiaoming Gu updated HARMONY-6024:
---------------------------------

    Attachment: H6024-V1.patch

This message is for V1 patch.

Some code is added to generate pseudo copy instruction if the original two MOV are both pseudo.

(The patch for H6016 is included.) 

> [drlvm][jit] Incorrect generated instruction in peephole opt for MOV
> --------------------------------------------------------------------
>
>                 Key: HARMONY-6024
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6024
>             Project: Harmony
>          Issue Type: Bug
>         Environment: IA32 Windows
>            Reporter: Xiaoming Gu
>         Attachments: H6024-V1.patch
>
>
> In the case 1 of peephole opt for MOV in Ia32PeepHole.cpp, the optimization is like following:
>         MOV opnd, opnd2             MOV opnd3, opnd2
>         MOV opnd3, opnd      =>
> The bug is the new MOV instruction is always generated by "newInst" even the original
MOV instructions are both pseudo copy, which will cause an assertion error later.

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