+ set_reg_value(in);
+ }
+}
+
+void be_peephole_new_node(ir_node * nw)
+{
+ be_liveness_introduce(lv, nw);
+}
+
+/**
+ * must be called from peephole optimisations before a node will be killed
+ * and its users will be redirected to new_node.
+ * so bepeephole can update its internal state.
+ *
+ * Note: killing a node and rewiring is only allowed if new_node produces
+ * the same registers as old_node.
+ */
+static void be_peephole_before_exchange(const ir_node *old_node,
+ ir_node *new_node)
+{
+ const arch_register_t *reg;
+ const arch_register_class_t *cls;
+ unsigned reg_idx;
+ unsigned cls_idx;
+
+ DB((dbg, LEVEL_1, "About to exchange and kill %+F with %+F\n", old_node, new_node));
+
+ if (current_node == old_node) {
+ /* next node to be processed will be killed. Its scheduling predecessor
+ * must be processed next. */
+ current_node = sched_next(current_node);
+ assert (!is_Bad(current_node));
+ }
+
+ if (!mode_is_data(get_irn_mode(old_node)))
+ return;
+
+ reg = arch_get_irn_register(old_node);
+ if (reg == NULL) {
+ panic("No register assigned at %+F", old_node);