we need last_uses even without preferences

[r26517]

diff --git a/ir/be/benewalloc.c b/ir/be/benewalloc.c
index c19b1ef..453beb7 100644 (file)
--- a/ir/be/benewalloc.c
+++ b/ir/be/benewalloc.c
@@ -364,7 +364,8 @@ static void analyze_block(ir_node *block, void *data)
                if (is_Phi(node))
                        break;
 
-               check_defs(&live_nodes, weight, node);
+               if (create_preferences)
+                       check_defs(&live_nodes, weight, node);
 
                /* mark last uses */
                arity = get_irn_arity(node);
@@ -391,22 +392,24 @@ static void analyze_block(ir_node *block, void *data)
 
                be_liveness_transfer(cls, node, &live_nodes);
 
-               /* update weights based on usage constraints */
-               for (i = 0; i < arity; ++i) {
-                       const arch_register_req_t *req;
-                       const unsigned            *limited;
-                       ir_node                   *op = get_irn_n(node, i);
+               if (create_preferences) {
+                       /* update weights based on usage constraints */
+                       for (i = 0; i < arity; ++i) {
+                               const arch_register_req_t *req;
+                               const unsigned            *limited;
+                               ir_node                   *op = get_irn_n(node, i);
 
-                       if (!arch_irn_consider_in_reg_alloc(cls, op))
-                               continue;
+                               if (!arch_irn_consider_in_reg_alloc(cls, op))
+                                       continue;
 
-                       req = arch_get_register_req(node, i);
-                       if (!(req->type & arch_register_req_type_limited))
-                               continue;
+                               req = arch_get_register_req(node, i);
+                               if (!(req->type & arch_register_req_type_limited))
+                                       continue;
 
-                       limited = req->limited;
-                       give_penalties_for_limits(&live_nodes, weight * USE_FACTOR, limited,
-                                                 op);
+                               limited = req->limited;
+                               give_penalties_for_limits(&live_nodes, weight * USE_FACTOR, limited,
+                                                                                 op);
+                       }
                }
        }
 
@@ -1915,8 +1918,7 @@ static void be_straight_alloc_cls(void)
 
        be_clear_links(irg);
 
-       if (create_preferences)
-               irg_block_walk_graph(irg, NULL, analyze_block, NULL);
+       irg_block_walk_graph(irg, NULL, analyze_block, NULL);
        if (create_congruence_classes)
                combine_congruence_classes();