+typedef struct pressure_walker_env_t pressure_walker_env_t;
+struct pressure_walker_env_t {
+ be_irg_t *birg;
+ be_lv_t *lv;
+ double insn_count;
+ double regpressure;
+ int max_pressure;
+ const arch_register_class_t *cls;
+};
+
+static void check_reg_pressure_class(pressure_walker_env_t *env,
+ ir_node *block,
+ const arch_register_class_t *cls)
+{
+ be_irg_t *birg = env->birg;
+ ir_graph *irg = be_get_birg_irg(birg);
+ const arch_env_t *aenv = be_get_birg_arch_env(birg);
+ ir_node *irn;
+ ir_nodeset_t live_nodes;
+ int max_live;
+
+ ir_nodeset_init(&live_nodes);
+ be_liveness_end_of_block(env->lv, aenv, cls, block, &live_nodes);
+ max_live = ir_nodeset_size(&live_nodes);
+ env->regpressure += max_live;
+
+ sched_foreach_reverse(block, irn) {
+ int cnt;
+
+ if(is_Phi(irn))
+ break;
+
+ be_liveness_transfer(aenv, cls, irn, &live_nodes);
+ cnt = ir_nodeset_size(&live_nodes);
+ max_live = cnt < max_live ? max_live : cnt;
+ env->regpressure += cnt;
+ env->insn_count++;
+ }
+
+ if(max_live > env->max_pressure)
+ env->max_pressure = max_live;
+
+ stat_be_block_regpressure(irg, block, max_live, cls->name);
+ ir_nodeset_destroy(&live_nodes);
+}
+
+static void stat_reg_pressure_block(ir_node *block, void *data) {
+ pressure_walker_env_t *env = data;
+
+ check_reg_pressure_class(env, block, env->cls);
+}
+
+void be_do_stat_reg_pressure(be_irg_t *birg, const arch_register_class_t *cls) {
+ pressure_walker_env_t env;
+ ir_graph *irg = be_get_birg_irg(birg);
+ double average_pressure;
+
+ env.birg = birg;
+ env.insn_count = 0;
+ env.max_pressure = 0;
+ env.regpressure = 0;
+ be_liveness_assure_sets(be_assure_liveness(birg));
+ env.lv = be_get_birg_liveness(birg);
+ env.cls = cls;
+
+ /* Collect register pressure information for each block */
+ irg_block_walk_graph(irg, stat_reg_pressure_block, NULL, &env);
+
+ average_pressure = env.regpressure / env.insn_count;
+ stat_ev_emit("bechordal_average_register_pressure", average_pressure);
+ stat_ev_emit("bechordal_maximum_register_pressure", env.max_pressure);
+}
+
+
+
+
+typedef struct _estimate_irg_costs_env_t {
+ const arch_env_t *arch_env;
+ ir_exec_freq *execfreqs;
+ double costs;
+} estimate_irg_costs_env_t;