Handled RegParams and Barriers better in constraint handling

[libfirm] / ir / be / becopyheur.c

diff --git a/ir/be/becopyheur.c b/ir/be/becopyheur.c
index 1dfb38f..3f642d2 100644 (file)
--- a/ir/be/becopyheur.c
+++ b/ir/be/becopyheur.c
@@ -525,6 +525,8 @@ static void ou_optimize(unit_t *ou) {
        arch_put_non_ignore_regs(aenv, cls, ign_regs);
        bitset_and(pos_regs, ign_regs);
 
+       assert(bitset_popcnt(pos_regs) != 0 && "No register is allowed for this node !!?");
+
        /* create new qnode */
        bitset_foreach(pos_regs, i)
                ou_insert_qnode(ou, new_qnode(ou, i));