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From "Egor Pasko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5597) [drlvm][jit][opt] Branch Translator zero comparison improvement
Date Sun, 23 Mar 2008 15:21:25 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581396#action_12581396
] 

Egor Pasko commented on HARMONY-5597:
-------------------------------------

Oh, signed shift! of course! sorry :)

> [drlvm][jit][opt] Branch Translator zero comparison improvement
> ---------------------------------------------------------------
>
>                 Key: HARMONY-5597
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5597
>             Project: Harmony
>          Issue Type: Improvement
>            Reporter: George Timoshenko
>            Assignee: Mikhail Fursov
>            Priority: Minor
>
> In the implementation of branch translator enhancement (HARMONY-5580)
> prevInst - can be lookuped more carefully than just:
> Inst * prevInst = inst->getPrevInst();
> +
> +                    if (prevInst && falseInst)
> There can be some insts that do not affect FALGS between CMP and BRANCH.
> And it is also correct when CMP belongs to another BB that is prior to the BRANCH's one.
(the only restriction is: FLAGS are safe from CMP to BRANCH)

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