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From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-2247) [drlvm][jit][performance] System::arraycopy by 'rep move' instruction
Date Wed, 22 Nov 2006 14:56:03 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-2247?page=comments#action_12451949 ] 
            
Alexey Varlamov commented on HARMONY-2247:
------------------------------------------

Yep, now ~20% faster on pure IA32 box and negligible (~1%) speedup on em64 machine (32 bit
OS).

> [drlvm][jit][performance] System::arraycopy by 'rep move' instruction
> ---------------------------------------------------------------------
>
>                 Key: HARMONY-2247
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2247
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: ia32
>            Reporter: George Timoshenko
>         Assigned To: Alexey Varlamov
>         Attachments: arraycopy_rep_move_SVN.diff, ArraycopyTest.java
>
>
> Currenlty Jitrino::OPT instead of 'System::arraycopy' call generates a loop that copies
arrays with respective checks.
> The improvements is in replacing the loop by 'rep move' instruction which is available
on ia32.
> (This is possible as the instruction is now supported in Encoder. See the patch for HARMONY-2223)

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