+void be_Perm_reduce(ir_node *perm, int new_size, int *map)
+{
+ ir_graph *irg = get_irn_irg(perm);
+ int n = get_irn_arity(perm);
+ be_reg_data_t *old_data = xmalloc(n * sizeof(old_data[0]));
+ be_node_attr_t *attr = get_irn_attr(perm);
+ ir_node **new_in = NEW_ARR_D(ir_node *, irg->obst, new_size + 1);
+
+ int i;
+
+ assert(be_is_Perm(perm));
+ assert(new_size <= n);
+
+ /* save the old register data */
+ memcpy(old_data, attr->reg_data, n * sizeof(old_data[0]));
+
+ /* compose the new in array and set the new register data directly in place */
+ for (i = 0; i < n; ++i) {
+ int idx = map[i];
+ if (idx >= 0) {
+ new_in[idx] = get_irn_n(perm, i);
+ attr->reg_data[idx] = old_data[i];
+ }
+ }
+
+ free(old_data);
+ set_irn_in(perm, new_size, new_in);
+}
+