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Posted to commits@harmony.apache.org by "Pavel Ozhdikhin (JIRA)" <ji...@apache.org> on 2006/12/11 15:06:22 UTC
[jira] Updated: (HARMONY-2607) [drlvm][jit][opt][performance]
improve optimizer to simplify arithmetic calculations involving loops
[ http://issues.apache.org/jira/browse/HARMONY-2607?page=all ]
Pavel Ozhdikhin updated HARMONY-2607:
-------------------------------------
Attachment: Test.java
The test is attached.
> [drlvm][jit][opt][performance] improve optimizer to simplify arithmetic calculations involving loops
> ----------------------------------------------------------------------------------------------------
>
> Key: HARMONY-2607
> URL: http://issues.apache.org/jira/browse/HARMONY-2607
> Project: Harmony
> Issue Type: Improvement
> Components: DRLVM
> Environment: Windows/IA32
> Reporter: Pavel Ozhdikhin
> Priority: Minor
> Attachments: Test.java
>
>
> In the attached test arithmetical calculations and loops may be safely eliminated in both methods test1() and test2().
> Indeed , the results below show that JRockit 1.5 can eliminate them - it faster executes the first run and don't spend time at all for a second:
> ================================
> JRockit 1.5 results:
> >C:\jrockit-jdk1.5.0\bin\java.exe -version
> java version "1.5.0"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
> BEA WebLogic JRockit(R) (build dra-38972-20041208-2001-win-ia32, R25.0.0-75, GC: System optimized over throughput (initial strategy single
> parpar))
> >C:\jrockit-jdk1.5.0\bin\java.exe Test
> 1st run: 203
> 2nd run: 0
> ================================
> DRLVM results:
> >C:\win_ia32_msvc_release\deploy\jre\bin\java.exe -version
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its licensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r483842, (Dec 11 2006), Windows/ia32/msvc 1310, release build
> http://incubator.apache.org/harmony
> C:\win_ia32_msvc_release\deploy\jre\bin\java.exe Test
> 1st run: 19734
> 2nd run: 14828
> ================================
> The optimizer should be able to eliminate such code if it does not have ane side-effect.
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