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Annotation of researchv8dc/cmd/map/libmap/cubrt.c, revision 1.1.1.1

1.1       root        1: double fabs();
                      2: double cubrt(a)
                      3: double a;
                      4: {
                      5:        double x,y,x1;
                      6:        if(a==0) 
                      7:                return(0.);
                      8:        y = 1;
                      9:        if(a<0) {
                     10:                y = -y;
                     11:                a = -a;
                     12:        }
                     13:        while(a<1) {
                     14:                a *= 8;
                     15:                y /= 2;
                     16:        }
                     17:        while(a>1) {
                     18:                a /= 8;
                     19:                y *= 2;
                     20:        }
                     21:        x = 1;
                     22:        do {
                     23:                x1 = x;
                     24:                x = (2*x1+a/(x1*x1))/3;
                     25:        } while(fabs(x-x1)>10.e-15);
                     26:        return(x*y);
                     27: }

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