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Posted to commits@harmony.apache.org by "Evgeniya Maenkova (JIRA)" <ji...@apache.org> on 2008/02/11 17:36:11 UTC
[jira] Closed: (HARMONY-5478) [classlib] [luni]
Math.floor/ceil/rint can be implemented w/o JNI calls
[ https://issues.apache.org/jira/browse/HARMONY-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Evgeniya Maenkova closed HARMONY-5478.
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Works, as expected. Thanks, Aleksey
> [classlib] [luni] Math.floor/ceil/rint can be implemented w/o JNI calls
> -----------------------------------------------------------------------
>
> Key: HARMONY-5478
> URL: https://issues.apache.org/jira/browse/HARMONY-5478
> Project: Harmony
> Issue Type: Improvement
> Components: Classlib
> Reporter: Evgeniya Maenkova
> Assignee: Alexey Petrenko
> Attachments: luni.math.2
>
>
> With this improvement the test mentioned below shows 17% boost on my laptop.
> package math;
> public class Floor {
> public static void main(String[] args) {
> double d1 = -123123.234;
> double d2 = 1231233.123123;
> double d3 = 23423.23;
> for (int i = 0; i < 2500 * 2500; i ++) {
> Math.floor(d3);
> Math.ceil(d1);
> Math.rint(d1);
> Math.floor(d2);
> Math.ceil(d2);
> Math.rint(d2);
> Math.floor(d3);
> Math.ceil(d3);
> Math.rint(d3);
> }
>
> long start = System.currentTimeMillis();
> for (int i = 0; i < 2500 * 2500; i ++) {
> Math.floor(d3);
> Math.ceil(d1);
> Math.rint(d1);
> Math.floor(d2);
> Math.ceil(d2);
> Math.rint(d2);
> Math.floor(d3);
> Math.ceil(d3);
> Math.rint(d3);
> }
> System.out.println("floor result: " + (System.currentTimeMillis() - start));
> }
> }
> Administrator@EGMAENKO-MOBL /cygdrive/c/ecl_311_ws/MicroBenches/bin1
> $ /cygdrive/c/home_test/temp_builds/egm_r618602/bin/java -Xem:server math.Floor
> floor result: 17359
> Administrator@EGMAENKO-MOBL /cygdrive/c/ecl_311_ws/MicroBenches/bin1
> $ /cygdrive/c/home_test/temp_builds/egm_r618602_Mj_Mc/bin/java -Xem:server math
> .Floor
> floor result: 14876
> Administrator@EGMAENKO-MOBL /cygdrive/c/ecl_311_ws/MicroBenches/bin1
> $
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