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From "George Timoshenko (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-3405) [drlvm][jit][opt] redundant reservation of r13-r14-r15 for each method on EM64T
Date Tue, 20 Mar 2007 04:40:32 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

George Timoshenko updated HARMONY-3405:
---------------------------------------

    Attachment: r13-r14-r15_v2.patch

as r11 is not a callee save register we can use it insted of r14 and forget about reservation
at all.

> [drlvm][jit][opt] redundant reservation of r13-r14-r15 for each method on EM64T
> -------------------------------------------------------------------------------
>
>                 Key: HARMONY-3405
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3405
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: EM64T
>            Reporter: George Timoshenko
>         Attachments: r13-r14-r15.patch, r13-r14-r15_v2.patch
>
>
> Jitrino.OPT starts each method from 
> push r13
> push r14
> push r15
> and finishes it with
> pop r13
> pop r14
> pop r15
> r15 is not use by OPT at all
> r13 is used for some specific in codegen, that can be fixed
> r14 is used for transforming immediate calls to register form when target offset does
not fit inot 32 bits
> but push-pop of r14 can be ommitted when a method does not contain any direct calls

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