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From "Pavel Ozhdikhin (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-2607) [drlvm][jit][opt][performance] improve optimizer to simplify arithmetic calculations involving loops
Date Mon, 11 Dec 2006 14:04:24 GMT
[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


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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