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From "Evgeniya Maenkova (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-5480) [drlvm][jit] Some of java.lang.Math methods could be implemented by api_magics
Date Sat, 09 Feb 2008 14:05:07 GMT
[drlvm][jit] Some of java.lang.Math methods could be implemented by api_magics
------------------------------------------------------------------------------

                 Key: HARMONY-5480
                 URL: https://issues.apache.org/jira/browse/HARMONY-5480
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
            Reporter: Evgeniya Maenkova
         Attachments: MathTest.java, vm.math.patch2

The patch gives >7x speedup on my laptop on test mentioned below:

package math;

public class MathTest {
	static void f() {
		Math.abs(-123987.1236d);
		Math.asin(0.7);
		Math.acos(0.7);		
		Math.log(123.123);
		Math.log10(123.123);
		Math.log1p(123.123);		
		Math.sin(12312.123);
		Math.cos(12312.123);
		Math.sqrt(234234.234234);
		Math.tan(234234.12342134);
		Math.atan(2347.234);
		Math.atan2(231.123, 0);
		Math.abs(-123.1231123f);				
	}
    public static void main(String[] args) {    	
    	System.out.println("Warmup started....");
    	for (int i = 0; i < 2500 * 2500; i ++) {
		     f();
		}
    	for (int i = 0; i < 250 * 2500; i ++) {
		     f();
		}
    	System.out.println("Warmup ended....");
    	long start = System.currentTimeMillis();		
		for (int i = 0; i < 2500 * 2500; i ++) {
    		f();
		}
		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_Mj_Mc/bin/java -XX:jit.arg.Math
_as_magic=true -Xem:server math.MathTest
Warmup started....
Warmup ended....
floor result: 4875

Administrator@EGMAENKO-MOBL /cygdrive/c/ecl_311_ws/MicroBenches/bin1
$ /cygdrive/c/home_test/temp_builds/egm_r618602_Mj_Mc/bin/java -XX:jit.arg.Math
_as_magic=false -Xem:server math.MathTest
Warmup started....
Warmup ended....
floor result: 34141




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