#include "iredges_t.h"
#include "irtools.h"
-/* Defined in iropt.c */
-pset *new_identities (void);
-void del_identities (pset *value_table);
-void add_identities (pset *value_table, ir_node *node);
-
/*------------------------------------------------------------------*/
/* apply optimizations of iropt to all nodes. */
/*------------------------------------------------------------------*/
if (optimized != n) exchange (n, optimized);
}
+/**
+ * Do local optimizations for a node.
+ *
+ * @param n the IR-node where to start. Typically the End node
+ * of a graph
+ *
+ * @note current_ir_graph must be set
+ */
static INLINE void do_local_optimize(ir_node *n) {
/* Handle graph state */
assert(get_irg_phase_state(current_ir_graph) != phase_building);
irg_walk(n, firm_clear_link, optimize_in_place_wrapper, NULL);
}
+/* Applies local optimizations (see iropt.h) to all nodes reachable from node n */
void local_optimize_node(ir_node *n) {
ir_graph *rem = current_ir_graph;
current_ir_graph = get_irn_irg(n);
*/
static void kill_dead_blocks(ir_node *block, void *env)
{
- if (get_Block_dom_depth(block) < 0)
- if (block != get_irg_end_block(current_ir_graph)) {
- /* we don't want that the end block of graphs with
- endless loops is marked bad (although it is of course */
- set_Block_dead(block);
- }
+ if (get_Block_dom_depth(block) < 0) {
+ /*
+ * Note that the new dominance code correctly handles
+ * the End block, i.e. it is always reachable from Start
+ */
+ set_Block_dead(block);
+ }
}
void
ir_graph *rem = current_ir_graph;
current_ir_graph = irg;
- if (get_irg_dom_state(current_ir_graph) == dom_consistent)
+ if (get_irg_dom_state(irg) == dom_consistent)
irg_block_walk_graph(irg, NULL, kill_dead_blocks, NULL);
do_local_optimize(get_irg_end(irg));
if (optimized != n) {
const ir_edge_t *edge;
- exchange(n, optimized);
- foreach_out_edge(optimized, edge) {
+ foreach_out_edge(n, edge) {
ir_node *succ = get_edge_src_irn(edge);
if (get_irn_link(succ) != waitq) {
set_irn_link(succ, waitq);
}
}
+ exchange(n, optimized);
}
}
void optimize_graph_df(ir_graph *irg) {
- pdeq *waitq = new_pdeq();
- int state = edges_activated(irg);
+ pdeq *waitq = new_pdeq();
+ int state = edges_activated(irg);
+ ir_graph *rem = current_ir_graph;
+
+ current_ir_graph = irg;
if (! state)
edges_activate(irg);
if (! state)
edges_deactivate(irg);
+
+ current_ir_graph = rem;
}
graveyard_obst = irg->obst;
/* A new obstack, where the reachable nodes will be copied to. */
- rebirth_obst = xmalloc (sizeof(*rebirth_obst));
+ rebirth_obst = xmalloc(sizeof(*rebirth_obst));
current_ir_graph->obst = rebirth_obst;
obstack_init (current_ir_graph->obst);
current_ir_graph->last_node_idx = 0;
- /* We also need a new hash table for cse */
- del_identities (irg->value_table);
- irg->value_table = new_identities ();
+ /* We also need a new value table for CSE */
+ del_identities(irg->value_table);
+ irg->value_table = new_identities();
/* Copy the graph from the old to the new obstack */
copy_graph_env(1);