isl_qpolynomial_from_aff: create private copy of divs

Otherwise, reduce_divs could end up modifying the divs of the input isl_aff.

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>

diff --git a/isl_polynomial.c b/isl_polynomial.c
index 046b63a..ff3196f 100644 (file)
--- a/isl_polynomial.c
+++ b/isl_polynomial.c
@@ -2973,6 +2973,7 @@ __isl_give isl_qpolynomial *isl_qpolynomial_from_aff(__isl_take isl_aff *aff)
 
        isl_mat_free(qp->div);
        qp->div = isl_mat_copy(aff->ls->div);
+       qp->div = isl_mat_cow(qp->div);
        if (!qp->div)
                goto error;