X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbeifg_std.c;h=6fe13610bea97451f1953a038c765cfb0dd4daac;hb=335c4762b4ac75793f3614d01c197a5289b4a946;hp=59860a67adfa44d568f4c6bae5ac7269999e5fa6;hpb=6122410ce4188a5aea78771c7f9d326ab416efd2;p=libfirm

diff --git a/ir/be/beifg_std.c b/ir/be/beifg_std.c
index 59860a67a..6fe13610b 100644
--- a/ir/be/beifg_std.c
+++ b/ir/be/beifg_std.c
@@ -6,6 +6,7 @@
  * Copyright (C) 2005 Universitaet Karlsruhe
  * Released under the GPL
  */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -19,6 +20,7 @@
 #include "irgwalk.h"
 
 #include "be_t.h"
+#include "belive_t.h"
 #include "bera.h"
 #include "beifg_t.h"
 #include "bechordal_t.h"
@@ -70,13 +72,22 @@ static void find_nodes(const void *self, void *iter) {
 	nodes_iter_t *it = iter;
 
 	obstack_init(&it->obst);
-	it->n    = 0;
-	it->curr = 0;
+	it->n     = 0;
+	it->curr  = 0;
+	it->env   = ifg->env;
 
 	irg_block_walk_graph(ifg->env->irg, nodes_walker, NULL, iter);
 	it->nodes = obstack_finish(&it->obst);
 }
 
+static INLINE void node_break(nodes_iter_t *it, int force)
+{
+	if((it->curr >= it->n || force) && it->nodes) {
+		obstack_free(&it->obst, NULL);
+		it->nodes = NULL;
+	}
+}
+
 static ir_node *get_next_node(void *iter)
 {
 	nodes_iter_t *it = iter;
@@ -85,10 +96,7 @@ static ir_node *get_next_node(void *iter)
 	if(it->curr < it->n)
 		res = it->nodes[it->curr++];
 
-	if(it->curr >= it-> n && it->nodes) {
-		obstack_free(&it->obst, NULL);
-		it->nodes = NULL;
-	}
+	node_break(it, 0);
 
 	return res;
 }
@@ -104,87 +112,82 @@ static ir_node *ifg_std_nodes_next(const void *self, void *iter)
 	return get_next_node(iter);
 }
 
+static void ifg_std_nodes_break(const void *self, void *iter)
+{
+	node_break(iter, 1);
+}
+
 typedef struct _adj_iter_t {
 	const be_chordal_env_t *env;
 	const ir_node *irn;
-	struct obstack obst;
-	int degree;
-	unsigned visited_nr;
-	unsigned build_list : 1;
-
-	int curr;
-	ir_node **neighbours;
+	int reached_end;
+	pset *neighbours;
 } adj_iter_t;
 
 static void find_neighbour_walker(ir_node *block, void *data)
 {
 	adj_iter_t *it          = data;
-	unsigned visited        = it->visited_nr;
 	struct list_head *head  = get_block_border_head(it->env, block);
 
 	border_t *b;
 	int has_started = 0;
 
+	if(!is_live_in(block, it->irn) && block != get_nodes_block(it->irn))
+		return;
+
 	foreach_border_head(head, b) {
 		ir_node *irn = b->irn;
 
-		if(irn == it->irn)
-			has_started = b->is_def;
-
-		/*
-		 * If the def/use of the node is inside the live range
-		 * of the node in question, they interfere.
-		 * To avoid that a node is added twice, we record the
-		 * visit in the visited number provided by core firm.
-		 */
-		else if(has_started && get_irn_visited(irn) < visited) {
-			if(it->build_list)
-				obstack_ptr_grow(&it->obst, irn);
-
-			set_irn_visited(irn, visited);
-			it->degree++;
+		if(irn == it->irn) {
+			if(b->is_def)
+				has_started = 1;
+			else
+				break; /* if we reached the end of the node's lifetime we can safely break */
+		}
+		else if(b->is_def) {
+			/* if any other node than the one in question starts living, add it to the set */
+			pset_insert_ptr(it->neighbours, irn);
 		}
+		else if(!has_started) {
+			/* we only delete, if the live range in question has not yet started */
+			pset_remove_ptr(it->neighbours, irn);
+		}
+
 	}
 }
 
-static void find_neighbours(const ifg_std_t *ifg, adj_iter_t *it, const ir_node *irn, int build_list)
+static void find_neighbours(const ifg_std_t *ifg, adj_iter_t *it, const ir_node *irn)
 {
-	if(build_list)
-		obstack_init(&it->obst);
+	it->env         = ifg->env;
+	it->irn         = irn;
+	it->neighbours  = pset_new_ptr(16);
+	it->reached_end = 0;
 
-	it->env        = ifg->env;
-	it->irn        = irn;
-	it->degree     = 0;
-	it->visited_nr = get_irg_visited(ifg->env->irg) + 1;
-	it->build_list = build_list;
-	it->neighbours = NULL;
-	it->curr       = 0;
-
-	set_irg_visited(ifg->env->irg, it->visited_nr);
 	dom_tree_walk(get_nodes_block(irn), find_neighbour_walker, NULL, it);
+}
 
-	if(build_list)
-		it->neighbours = obstack_finish(&it->obst);
+static INLINE void neighbours_break(adj_iter_t *it, int force)
+{
+	if((it->reached_end || force) && it->neighbours) {
+		del_pset(it->neighbours);
+		it->neighbours = NULL;
+	}
 }
 
 static ir_node *get_next_neighbour(adj_iter_t *it) {
-	ir_node *res = NULL;
-
-	if(it->curr < it->degree)
-		res = it->neighbours[it->curr++];
+	ir_node *res = pset_next(it->neighbours);
 
-	if(it->curr >= it->degree && it->neighbours) {
-		obstack_free(&it->obst, NULL);
-		it->neighbours = NULL;
-	}
+	it->reached_end = res == NULL;
+	neighbours_break(it, 0);
 
 	return res;
 }
 
 static ir_node *ifg_std_neighbours_begin(const void *self, void *iter, const ir_node *irn)
 {
-	find_neighbours(self, iter, irn, 1);
-	return get_next_neighbour(iter);
+	adj_iter_t *it = iter;
+	find_neighbours(self, iter, irn);
+	return pset_first(it->neighbours);
 }
 
 static ir_node *ifg_std_neighbours_next(const void *self, void *iter)
@@ -192,21 +195,148 @@ static ir_node *ifg_std_neighbours_next(const void *self, void *iter)
 	return get_next_neighbour(iter);
 }
 
+static void ifg_std_neighbours_break(const void *self, void *iter)
+{
+	neighbours_break(iter, 1);
+}
+
+typedef struct _cliques_iter_t {
+	struct obstack ob;
+	const be_chordal_env_t *cenv;
+	ir_node **buf;
+	ir_node **blocks;
+	int n_blocks, blk;
+	struct list_head *bor;
+	pset *living;
+} cliques_iter_t;
+
+static INLINE void free_clique_iter(cliques_iter_t *it) {
+	it->n_blocks = -1;
+	obstack_free(&it->ob, NULL);
+	del_pset(it->living);
+}
+
+static void get_blocks_dom_order(ir_node *blk, void *env) {
+	cliques_iter_t *it = env;
+	obstack_ptr_grow(&it->ob, blk);
+}
+
+#define pset_foreach(pset, irn)  for(irn=pset_first(pset); irn; irn=pset_next(pset))
+
+
+/**
+ * NOTE: Be careful when changing this function!
+ *       First understand the control flow of consecutive calls.
+ */
+static INLINE int get_next_clique(cliques_iter_t *it) {
+
+	/* continue in the block we left the last time */
+	for (; it->blk < it->n_blocks; it->blk++) {
+		int output_on_shrink = 0;
+		struct list_head *head = get_block_border_head(it->cenv, it->blocks[it->blk]);
+
+		/* on entry to a new block set the first border ... */
+		if (!it->bor)
+			it->bor = head->prev;
+
+		/* ... otherwise continue with the border we left the last time */
+		for (; it->bor != head; it->bor = it->bor->prev) {
+			border_t *b = list_entry(it->bor, border_t, list);
+
+			/* if its a definition irn starts living */
+			if (b->is_def) {
+				pset_insert_ptr(it->living, b->irn);
+				if (b->is_real)
+					output_on_shrink = 1;
+			} else
+
+			/* if its the last usage the irn dies */
+			{
+				/* before shrinking the set, return the current maximal clique */
+				if (output_on_shrink) {
+					int count = 0;
+					ir_node *irn;
+
+					/* fill the output buffer */
+					pset_foreach(it->living, irn)
+						it->buf[count++] = irn;
+
+					assert(count > 0 && "We have a 'last usage', so there must be sth. in it->living");
+
+					return count;
+				}
+
+				pset_remove_ptr(it->living, b->irn);
+			}
+		}
+
+		it->bor = NULL;
+		assert(0 == pset_count(it->living) && "Something has survived! (At the end of the block it->living must be empty)");
+	}
+
+	if (it->n_blocks != -1)
+		free_clique_iter(it);
+
+	return -1;
+}
+
+static int ifg_std_cliques_begin(const void *self, void *iter, ir_node **buf)
+{
+	const ifg_std_t *ifg = self;
+	cliques_iter_t *it = iter;
+	ir_node *start_bl = get_irg_start_block(ifg->env->irg);
+
+	obstack_init(&it->ob);
+	dom_tree_walk(start_bl, get_blocks_dom_order, NULL, it);
+
+	it->cenv     = ifg->env;
+	it->buf      = buf;
+	it->n_blocks = obstack_object_size(&it->ob) / sizeof(void *);
+	it->blocks   = obstack_finish(&it->ob);
+	it->blk      = 0;
+	it->bor      = NULL;
+	it->living   = pset_new_ptr(2 * arch_register_class_n_regs(it->cenv->cls));
+
+	return get_next_clique(it);
+}
+
+static int ifg_std_cliques_next(const void *self, void *iter)
+{
+	return get_next_clique(iter);
+}
+
+static void ifg_std_cliques_break(const void *self, void *iter)
+{
+	free_clique_iter(iter);
+}
+
+
 static int ifg_std_degree(const void *self, const ir_node *irn)
 {
 	adj_iter_t it;
-	find_neighbours(self, &it, irn, 0);
-	return it.degree;
+	int degree;
+	find_neighbours(self, &it, irn);
+	degree = pset_count(it.neighbours);
+	neighbours_break(&it, 1);
+	return degree;
 }
 
 static const be_ifg_impl_t ifg_std_impl = {
-	MAX(sizeof(adj_iter_t), sizeof(nodes_iter_t)),
+	sizeof(nodes_iter_t),
+	sizeof(adj_iter_t),
+	sizeof(cliques_iter_t),
+
 	ifg_std_free,
 	ifg_std_connected,
 	ifg_std_neighbours_begin,
 	ifg_std_neighbours_next,
+	ifg_std_neighbours_break,
 	ifg_std_nodes_begin,
 	ifg_std_nodes_next,
+	ifg_std_nodes_break,
+	ifg_std_cliques_begin,
+	ifg_std_cliques_next,
+	ifg_std_cliques_break,
 	ifg_std_degree
 };