isl_basic_set_solve_ilp: fix handling of sets with equalities

First, the input set should be protected from being modified,
and second, the test for whether a solution is requested was wrong.

diff --git a/isl_ilp.c b/isl_ilp.c
index 3aa10bd..15110c1 100644 (file)
--- a/isl_ilp.c
+++ b/isl_ilp.c
@@ -250,6 +250,7 @@ static enum isl_lp_result solve_ilp_with_eq(struct isl_basic_set *bset, int max,
        struct isl_mat *T = NULL;
        struct isl_vec *v;
 
+       bset = isl_basic_set_copy(bset);
        dim = isl_basic_set_total_dim(bset);
        v = isl_vec_alloc(bset->ctx, 1 + dim);
        if (!v)
@@ -261,12 +262,13 @@ static enum isl_lp_result solve_ilp_with_eq(struct isl_basic_set *bset, int max,
                goto error;
        res = isl_basic_set_solve_ilp(bset, max, v->el, opt, sol_p);
        isl_vec_free(v);
-       if (res == isl_lp_ok && *sol_p) {
+       if (res == isl_lp_ok && sol_p) {
                *sol_p = isl_mat_vec_product(T, *sol_p);
                if (!*sol_p)
                        res = isl_lp_error;
        } else
                isl_mat_free(T);
+       isl_basic_set_free(bset);
        return res;
 error:
        isl_mat_free(T);