assert that heur 3 assigns an existing register

diff --git a/ir/be/becopyheur3.c b/ir/be/becopyheur3.c
index c79f77e..62320ae 100644 (file)
--- a/ir/be/becopyheur3.c
+++ b/ir/be/becopyheur3.c
@@ -198,7 +198,10 @@ int co_solve_heuristic_java(copy_opt_t *co)
                if(bitset_is_set(nodes, idx)) {
                        unsigned t_idx             = node_map[idx];
                        unsigned col               = inv_col_map[be_java_coal_get_color(coal, t_idx)];
-                       const arch_register_t *reg = &co->cls->regs[col];
+                       const arch_register_t *reg;
+
+                       assert(col < n_regs);
+                       reg     = &co->cls->regs[col];
                        arch_set_irn_register(co->aenv, n, reg);
                }
        }