isl_tab_compute_reduced_basis: handle empty tables

diff --git a/basis_reduction_templ.c b/basis_reduction_templ.c
index bd5f842..7481798 100644 (file)
--- a/basis_reduction_templ.c
+++ b/basis_reduction_templ.c
@@ -60,6 +60,9 @@ struct isl_tab *isl_tab_compute_reduced_basis(struct isl_tab *tab)
        if (!tab)
                return NULL;
 
+       if (tab->empty)
+               return tab;
+
        ctx = tab->mat->ctx;
        dim = tab->n_var;
        B = tab->basis;