Implemented prologue/epilogue

[libfirm] / ir / be / belive.c

diff --git a/ir/be/belive.c b/ir/be/belive.c
index ce7d6b8..6d47244 100644 (file)
--- a/ir/be/belive.c
+++ b/ir/be/belive.c
@@ -14,6 +14,9 @@
 
 #include "beutil.h"
 #include "belive_t.h"
+#include "besched_t.h"
+
+#define DBG_MODULE "firm.be.liveness"
 
 FIRM_IMPL2(is_live_in, int, const ir_node *, const ir_node *)
 FIRM_IMPL2(is_live_out, int, const ir_node *, const ir_node *)
@@ -167,7 +170,7 @@ static int dump_block_func(ir_node *self, FILE *F, dump_reason_t reason)
        case dump_node_info_txt:
                if(!get_irg_live_info(get_irn_irg(self))->live)
                        return 0;
-
+#if 0
                fprintf(F, "liveness information:\n");
                {
                        irn_live_t *li;
@@ -183,6 +186,7 @@ static int dump_block_func(ir_node *self, FILE *F, dump_reason_t reason)
                                fprintf(F, "\n");
                        }
                }
+#endif
        }
 
        return 0;
@@ -266,3 +270,61 @@ void be_check_dominance(ir_graph *irg)
 {
        irg_walk_graph(irg, dom_check, NULL, NULL);
 }
+
+pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live)
+{
+       firm_dbg_module_t *dbg = firm_dbg_register(DBG_MODULE);
+       int i, n;
+       ir_node *x;
+
+       DBG((dbg, LEVEL_1, "%+F\n", irn));
+       for(x = pset_first(live); x; x = pset_next(live))
+               DBG((dbg, LEVEL_1, "\tlive: %+F\n", x));
+
+       if(arch_irn_consider_in_reg_alloc(arch_env, cls, irn))
+               pset_remove_ptr(live, irn);
+
+       for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+               ir_node *op = get_irn_n(irn, i);
+
+               if(arch_irn_consider_in_reg_alloc(arch_env, cls, op))
+                       pset_insert_ptr(live, op);
+       }
+
+       return live;
+}
+
+pset *be_liveness_end_of_block(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live)
+{
+       irn_live_t *li;
+
+       live_foreach(bl, li) {
+               ir_node *irn = (ir_node *) li->irn;
+               if(live_is_end(li) && arch_irn_consider_in_reg_alloc(arch_env, cls, irn))
+                       pset_insert_ptr(live, irn);
+       }
+
+       return live;
+}
+
+pset *be_liveness_nodes_live_at(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live)
+{
+       firm_dbg_module_t *dbg = firm_dbg_register(DBG_MODULE);
+       const ir_node *bl      = is_Block(pos) ? pos : get_nodes_block(pos);
+       ir_node *irn;
+
+       be_liveness_end_of_block(arch_env, cls, bl, live);
+
+       sched_foreach_reverse(bl, irn) {
+               /*
+                * If we encounter the node we want to insert the Perm after,
+                * exit immediately, so that this node is still live
+                */
+               if(irn == pos)
+                       return live;
+
+               be_liveness_transfer(arch_env, cls, irn, live);
+       }
+
+       return live;
+}