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From "Vera Petrashkova (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-2873) [drlvm][jit][opt] frem and drem instructions return incorrect result when divisor is Float/Double MIN_VALUE
Date Tue, 26 Dec 2006 08:32:21 GMT
[drlvm][jit][opt] frem and drem instructions return incorrect result when divisor is Float/Double
MIN_VALUE
-----------------------------------------------------------------------------------------------------------

                 Key: HARMONY-2873
                 URL: http://issues.apache.org/jira/browse/HARMONY-2873
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
         Environment: Linux and Windows
            Reporter: Vera Petrashkova


The following test demonstrates that frem and drem instructions return incorrect result when
divisor
is correspondently Float or Double MIN_VALUE. The result equals to dividend.
This issue is reproducible only on Jitrino/OPT.
On  interpreter and on Jitrino/JET result is equal to 0.0.

---------------------test.java---------------
public class test {
    public static void main(String[] args) {
        float f1 = 5.5f;
        float f2 = Float.MIN_VALUE;
        float ff = f1 % f2;
        System.out.println( ff == 0.0f ? 
                       "Float test passed. "+f1+" % "+f2+" = "+ff : 
                       "Float test failed. "+f1+" % "+f2+" = "+ff +" instead of 0.0" );

        double d1 = 3.3d;
        double d2 = Double.MIN_VALUE;
        double dd = d1 % d2;
        System.out.println( dd == 0.0d ? 
                       "Double test passed. "+d1+" % "+d2+" = "+dd : 
                       "Double test failed. "+d1+" % "+d2+" = "+dd +" instead of 0.0" );
    }
}
------------------------
Output is:
Float test failed. 5.5 % 1.4E-45 = 5.5 instead of 0.0
Double test failed. 3.3 % 4.9E-324 = 3.3 instead of 0.0


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