+ return NULL;
+
+ constraint->v = isl_vec_cow(constraint->v);
+ if (!constraint->v)
+ return isl_constraint_free(constraint);
+
+ isl_int_set(constraint->v->el[0], v);
+ return constraint;
+}
+
+/* Replace the constant term of "constraint" by "v".
+ */
+__isl_give isl_constraint *isl_constraint_set_constant_val(
+ __isl_take isl_constraint *constraint, __isl_take isl_val *v)
+{
+ constraint = isl_constraint_cow(constraint);
+ if (!constraint || !v)
+ goto error;
+ if (!isl_val_is_int(v))
+ isl_die(isl_constraint_get_ctx(constraint), isl_error_invalid,
+ "expecting integer value", goto error);
+ constraint->v = isl_vec_set_element_val(constraint->v, 0, v);
+ if (!constraint->v)
+ constraint = isl_constraint_free(constraint);
+ return constraint;
+error:
+ isl_val_free(v);
+ return isl_constraint_free(constraint);
+}
+
+__isl_give isl_constraint *isl_constraint_set_constant_si(
+ __isl_take isl_constraint *constraint, int v)
+{
+ constraint = isl_constraint_cow(constraint);
+ if (!constraint)
+ return NULL;
+
+ constraint->v = isl_vec_cow(constraint->v);
+ if (!constraint->v)
+ return isl_constraint_free(constraint);
+
+ isl_int_set_si(constraint->v->el[0], v);
+ return constraint;