use kill_node() instead of exchange to improve reduce_adr_usage()

[r18060]

diff --git a/ir/opt/ldstopt.c b/ir/opt/ldstopt.c
index ec264f2..07df1e9 100644 (file)
--- a/ir/opt/ldstopt.c
+++ b/ir/opt/ldstopt.c
@@ -391,7 +391,7 @@ static void handle_load_update(ir_node *load) {
                exchange(info->projs[pn_Load_M], mem);
                if (info->projs[pn_Load_X_regular])
                        exchange(info->projs[pn_Load_X_regular], new_r_Jmp(current_ir_graph, get_nodes_block(load)));
-               exchange(load, new_Bad());
+               kill_node(load);
                reduce_adr_usage(ptr);
        }
 }  /* handle_load_update */
@@ -523,7 +523,7 @@ static unsigned follow_Mem_chain(ir_node *load, ir_node *curr) {
                                if (info->projs[pn_Load_res])
                                        exchange(info->projs[pn_Load_res], value);
 
-                               exchange(load, new_Bad());
+                               kill_node(load);
                                reduce_adr_usage(ptr);
                                return res | DF_CHANGED;
                        }
@@ -572,7 +572,7 @@ static unsigned follow_Mem_chain(ir_node *load, ir_node *curr) {
                                        res |= CF_CHANGED;
                                }
 
-                               exchange(load, new_Bad());
+                               kill_node(load);
                                reduce_adr_usage(ptr);
                                return res |= DF_CHANGED;
                        }
@@ -700,7 +700,7 @@ static unsigned optimize_load(ir_node *load)
                        exchange(info->projs[pn_Load_X_regular], new_r_Jmp(current_ir_graph, get_nodes_block(load)));
                        res |= CF_CHANGED;
                }
-               exchange(load, new_Bad());
+               kill_node(load);
                reduce_adr_usage(ptr);
                return res | DF_CHANGED;
        }
@@ -726,7 +726,7 @@ static unsigned optimize_load(ir_node *load)
                if (info->projs[pn_Load_res])
                        exchange(info->projs[pn_Load_res], new_node);
 
-               exchange(load, new_Bad());
+               kill_node(load);
                reduce_adr_usage(ptr);
                return res | DF_CHANGED;
        }
@@ -776,7 +776,7 @@ static unsigned optimize_load(ir_node *load)
                                                        res |= DF_CHANGED;
                                                }
                                        }
-                                       exchange(load, new_Bad());
+                                       kill_node(load);
                                        reduce_adr_usage(ptr);
                                        return res;
                                } else {
@@ -812,7 +812,7 @@ static unsigned optimize_load(ir_node *load)
                                                        exchange(info->projs[pn_Load_res], copy_const_value(get_irn_dbg_info(load), c));
                                                        res |= DF_CHANGED;
                                                }
-                                               exchange(load, new_Bad());
+                                               kill_node(load);
                                                reduce_adr_usage(ptr);
                                                return res;
                                        } else {
@@ -895,7 +895,7 @@ static unsigned follow_Mem_chain_for_Store(ir_node *store, ir_node *curr) {
                        if (get_Store_volatility(pred) != volatility_is_volatile && !pred_info->projs[pn_Store_X_except]) {
                                DBG_OPT_WAW(pred, store);
                                exchange(pred_info->projs[pn_Store_M], get_Store_mem(pred));
-                               exchange(pred, new_Bad());
+                               kill_node(pred);
                                reduce_adr_usage(ptr);
                                return DF_CHANGED;
                        }
@@ -908,7 +908,7 @@ static unsigned follow_Mem_chain_for_Store(ir_node *store, ir_node *curr) {
                        if (! info->projs[pn_Store_X_except]) {
                                DBG_OPT_WAR(store, pred);
                                exchange(info->projs[pn_Store_M], mem);
-                               exchange(store, new_Bad());
+                               kill_node(store);
                                reduce_adr_usage(ptr);
                                return DF_CHANGED;
                        }