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Annotation of researchv8dc/libF77/pow_zi.c, revision 1.1

1.1     ! root        1: #include "complex"
        !             2: 
        !             3: pow_zi(p, a, b)        /* p = a**b  */
        !             4: dcomplex *p, *a;
        !             5: long int *b;
        !             6: {
        !             7: long int n;
        !             8: double t;
        !             9: dcomplex x;
        !            10: static dcomplex one = {1.0, 0.0};
        !            11: 
        !            12: n = *b;
        !            13: p->dreal = 1;
        !            14: p->dimag = 0;
        !            15: 
        !            16: if(n == 0)
        !            17:        return;
        !            18: if(n < 0)
        !            19:        {
        !            20:        n = -n;
        !            21:        z_div(&x, &one, a);
        !            22:        }
        !            23: else
        !            24:        {
        !            25:        x.dreal = a->dreal;
        !            26:        x.dimag = a->dimag;
        !            27:        }
        !            28: 
        !            29: for( ; ; )
        !            30:        {
        !            31:        if(n & 01)
        !            32:                {
        !            33:                t = p->dreal * x.dreal - p->dimag * x.dimag;
        !            34:                p->dimag = p->dreal * x.dimag + p->dimag * x.dreal;
        !            35:                p->dreal = t;
        !            36:                }
        !            37:        if(n >>= 1)
        !            38:                {
        !            39:                t = x.dreal * x.dreal - x.dimag * x.dimag;
        !            40:                x.dimag = 2 * x.dreal * x.dimag;
        !            41:                x.dreal = t;
        !            42:                }
        !            43:        else
        !            44:                break;
        !            45:        }
        !            46: }

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