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From "Evgeniya Maenkova (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5478) [classlib] [luni] Math.floor/ceil/rint can be implemented w/o JNI calls
Date Fri, 08 Feb 2008 23:48:08 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Evgeniya Maenkova updated HARMONY-5478:
---------------------------------------

    Attachment: luni.math.2

patch for luni module

> [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
>         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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