Test6855215.java

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/**
 * @test
 * @bug 6855215
 * @summary Calculation error (NaN) after about 1500 calculations
 *
 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:UseSSE=0 compiler.c1.Test6855215
 */

package compiler.c1;

public class Test6855215 {
    private double m;
    private double b;

    public static double log10(double x) {
        return Math.log(x) / Math.log(10);
    }

    void calcMapping(double xmin, double xmax, double ymin, double ymax) {
        m = (ymax - ymin) / (log10(xmax) - log10(xmin));
        b = (log10(xmin) * ymax - log10(xmax) * ymin);
    }

    public static void main(String[] args) {
        Test6855215 c = new Test6855215();
        for (int i = 0; i < 30000; i++) {
            c.calcMapping(91, 121, 177, 34);
            if (c.m != c.m) {
                throw new InternalError();
            }
        }
    }
}