+ for (i = get_irn_arity(irn) - 1; i >= 0; --i) {
+ ir_node *op = get_irn_n(irn, i);
+ ir_node *copy;
+ const arch_register_t *reg;
+ const arch_register_req_t *req;
+
+ if (arch_get_irn_reg_class(aenv, irn, i) != env->cls)
+ continue;
+
+ reg = arch_get_irn_register(aenv, op);
+
+ if (reg == NULL || !arch_register_type_is(reg, ignore))
+ continue;
+ if(arch_register_type_is(reg, joker))
+ continue;
+
+ req = arch_get_register_req(aenv, irn, i);
+ if (!arch_register_req_is(req, limited))
+ continue;
+
+ if (rbitset_is_set(req->limited, reg->index))
+ continue;
+
+ copy = be_new_Copy(env->cls, env->irg, bl, op);
+ be_stat_ev("constr_copy", 1);
+
+ sched_add_before(irn, copy);
+ set_irn_n(irn, i, copy);
+ DBG((dbg, LEVEL_3, "inserting ignore arg copy %+F for %+F pos %d\n", copy, irn, i));
+ }
+
+ insn = chordal_scan_insn(env, irn);
+