Пример #1
0
void
fmpz_poly_compose_divconquer(fmpz_poly_t res, 
                             const fmpz_poly_t poly1, const fmpz_poly_t poly2)
{
    const long len1 = poly1->length;
    const long len2 = poly2->length;
    long lenr;
    
    if (len1 == 0)
    {
        fmpz_poly_zero(res);
        return;
    }
    if (len1 == 1 || len2 == 0)
    {
        fmpz_poly_set_fmpz(res, poly1->coeffs);
        return;
    }
    
    lenr = (len1 - 1) * (len2 - 1) + 1;
    
    if (res != poly1 && res != poly2)
    {
        fmpz_poly_fit_length(res, lenr);
        _fmpz_poly_compose_divconquer(res->coeffs, poly1->coeffs, len1, 
                                                   poly2->coeffs, len2);
        _fmpz_poly_set_length(res, lenr);
        _fmpz_poly_normalise(res);
    }
    else
    {
        fmpz_poly_t t;
        fmpz_poly_init2(t, lenr);
        _fmpz_poly_compose_divconquer(t->coeffs, poly1->coeffs, len1,
                                                 poly2->coeffs, len2);
        _fmpz_poly_set_length(t, lenr);
        _fmpz_poly_normalise(t);
        fmpz_poly_swap(res, t);
        fmpz_poly_clear(t);
    }
}
Пример #2
0
void
_fmpz_poly_compose(fmpz * res, const fmpz * poly1, slong len1, 
                               const fmpz * poly2, slong len2)
{
    if (len1 == 1)
        fmpz_set(res, poly1);
    else if (len2 == 1)
        _fmpz_poly_evaluate_fmpz(res, poly1, len1, poly2);
    else if (len1 <= 4)
        _fmpz_poly_compose_horner(res, poly1, len1, poly2, len2);
    else
        _fmpz_poly_compose_divconquer(res, poly1, len1, poly2, len2);
}