* @brief Optimizations for a whole ir graph, i.e., a procedure.
* @author Christian Schaefer, Goetz Lindenmaier, Sebastian Felis,
* Michael Beck
- * @version $Id$
*/
#include "config.h"
#include "irgopt.h"
#include "irgmod.h"
#include "irgwalk.h"
+#include "ircons.h"
#include "adt/pdeq.h"
#include "iredges_t.h"
#include "irtools.h"
-/*------------------------------------------------------------------*/
-/* apply optimizations of iropt to all nodes. */
-/*------------------------------------------------------------------*/
-
/**
* A wrapper around optimize_inplace_2() to be called from a walker.
*/
if (get_opt_global_cse())
set_irg_pinned(irg, op_pin_state_floats);
- set_irg_outs_inconsistent(irg);
- set_irg_doms_inconsistent(irg);
- set_irg_loopinfo_inconsistent(irg);
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
/* Clean the value_table in irg for the CSE. */
new_identities(irg);
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 = rem;
}
+static void enqueue_node(ir_node *node, pdeq *waitq)
+{
+ if (get_irn_link(node) == waitq)
+ return;
+ pdeq_putr(waitq, node);
+ set_irn_link(node, waitq);
+}
+
+/**
+ * Enqueue all users of a node to a wait queue.
+ * Handles mode_T nodes.
+ */
+static void enqueue_users(ir_node *n, pdeq *waitq)
+{
+ foreach_out_edge(n, edge) {
+ ir_node *succ = get_edge_src_irn(edge);
+
+ enqueue_node(succ, waitq);
+
+ /* Also enqueue Phis to prevent inconsistencies. */
+ if (is_Block(succ)) {
+ foreach_out_edge(succ, edge2) {
+ ir_node *succ2 = get_edge_src_irn(edge2);
+
+ if (is_Phi(succ2)) {
+ enqueue_node(succ2, waitq);
+ }
+ }
+ } else if (get_irn_mode(succ) == mode_T) {
+ /* A mode_T node has Proj's. Because most optimizations
+ run on the Proj's we have to enqueue them also. */
+ enqueue_users(succ, waitq);
+ }
+ }
+}
+
/**
* Block-Walker: uses dominance depth to mark dead blocks.
*/
-static void kill_dead_blocks(ir_node *block, void *env)
+static void find_unreachable_blocks(ir_node *block, void *env)
{
- (void) env;
+ pdeq *waitq = (pdeq*) env;
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
- */
ir_graph *irg = get_irn_irg(block);
- exchange(block, get_irg_bad(irg));
+ ir_node *end = get_irg_end(irg);
+
+ foreach_block_succ(block, edge) {
+ ir_node *succ_block = get_edge_src_irn(edge);
+ enqueue_node(succ_block, waitq);
+ foreach_out_edge(succ_block, edge2) {
+ ir_node *succ = get_edge_src_irn(edge2);
+ if (is_Phi(succ))
+ enqueue_node(succ, waitq);
+ }
+ }
+ enqueue_node(end, waitq);
}
}
-/* Applies local optimizations (see iropt.h) to all nodes reachable from node n. */
void local_optimize_graph(ir_graph *irg)
{
ir_graph *rem = current_ir_graph;
current_ir_graph = rem;
}
-/**
- * Enqueue all users of a node to a wait queue.
- * Handles mode_T nodes.
- */
-static void enqueue_users(ir_node *n, pdeq *waitq)
-{
- const ir_edge_t *edge;
-
- foreach_out_edge(n, edge) {
- ir_node *succ = get_edge_src_irn(edge);
-
- if (get_irn_link(succ) != waitq) {
- pdeq_putr(waitq, succ);
- set_irn_link(succ, waitq);
- }
- if (get_irn_mode(succ) == mode_T) {
- /* A mode_T node has Proj's. Because most optimizations
- run on the Proj's we have to enqueue them also. */
- enqueue_users(succ, waitq);
- }
- }
-}
-
/**
* Data flow optimization walker.
* Optimizes all nodes and enqueue its users
}
}
-/* Applies local optimizations to all nodes in the graph until fixpoint. */
int optimize_graph_df(ir_graph *irg)
{
pdeq *waitq = new_pdeq();
ir_graph *rem = current_ir_graph;
ir_node *end;
- int state, changed;
current_ir_graph = irg;
- state = edges_assure(irg);
- assure_doms(irg);
-
- /* Clean the value_table in irg for the CSE. */
- new_identities(irg);
-
- if (get_opt_global_cse()) {
+ if (get_opt_global_cse())
set_irg_pinned(irg, op_pin_state_floats);
- }
- /* The following enables unreachable code elimination (=Blocks may be
- * Bad). We cannot enable it in global_cse nodes since we can't
- * determine a nodes block there and therefore can't remove all code
- * in unreachable blocks */
- set_irg_state(irg, IR_GRAPH_STATE_BAD_BLOCK);
- irg_block_walk_graph(irg, NULL, kill_dead_blocks, NULL);
+ /* enable unreachable code elimination */
+ assert(!irg_is_constrained(irg, IR_GRAPH_CONSTRAINT_OPTIMIZE_UNREACHABLE_CODE));
+ add_irg_constraints(irg, IR_GRAPH_CONSTRAINT_OPTIMIZE_UNREACHABLE_CODE);
+
+ new_identities(irg);
+ assure_edges(irg);
+ assure_doms(irg);
- /* invalidate info */
- set_irg_outs_inconsistent(irg);
- set_irg_doms_inconsistent(irg);
- set_irg_loopinfo_inconsistent(irg);
ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
-
- /* walk over the graph, but don't touch keep-alives */
irg_walk_graph(irg, NULL, opt_walker, waitq);
/* any optimized nodes are stored in the wait queue,
* so if it's not empty, the graph has been changed */
- changed = !pdeq_empty(waitq);
-
- /* finish the wait queue */
- while (! pdeq_empty(waitq)) {
- ir_node *n = (ir_node*)pdeq_getl(waitq);
- opt_walker(n, waitq);
+ while (!pdeq_empty(waitq)) {
+ /* finish the wait queue */
+ while (! pdeq_empty(waitq)) {
+ ir_node *n = (ir_node*)pdeq_getl(waitq);
+ opt_walker(n, waitq);
+ }
+ /* Calculate dominance so we can kill unreachable code
+ * We want this intertwined with localopts for better optimization (phase coupling) */
+ compute_doms(irg);
+ irg_block_walk_graph(irg, NULL, find_unreachable_blocks, waitq);
}
-
del_pdeq(waitq);
-
ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
- if (! state)
- edges_deactivate(irg);
+ /* disable unreachable code elimination */
+ clear_irg_constraints(irg, IR_GRAPH_CONSTRAINT_OPTIMIZE_UNREACHABLE_CODE);
+ add_irg_properties(irg, IR_GRAPH_PROPERTY_NO_UNREACHABLE_CODE);
+
+ /* invalidate infos */
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
+ edges_deactivate(irg);
/* Finally kill BAD and doublets from the keep alives.
- Doing this AFTER edges where deactivated saves cycles */
- end = get_irg_end(irg);
+ * Doing this AFTER edges where deactivated saves cycles */
+ end = get_irg_end(irg);
remove_End_Bads_and_doublets(end);
- clear_irg_state(irg, IR_GRAPH_STATE_BAD_BLOCK);
-
current_ir_graph = rem;
- return changed;
+
+ /* Note we do not have a reliable way to detect changes, since some
+ * localopt rules change the inputs of a node and do not return a new
+ * node, so we conservatively say true here */
+ return true;
+}
+
+void local_opts_const_code(void)
+{
+ ir_graph *irg = get_const_code_irg();
+ /* Clean the value_table in irg for the CSE. */
+ new_identities(irg);
+
+ walk_const_code(firm_clear_link, optimize_in_place_wrapper, NULL);
}
-/* Creates an ir_graph pass for optimize_graph_df. */
ir_graph_pass_t *optimize_graph_df_pass(const char *name)
{
return def_graph_pass_ret(name ? name : "optimize_graph_df", optimize_graph_df);
-} /* optimize_graph_df_pass */
+}