X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbecopyopt.c;h=d45ba4ca827ae0ac857b60c858924b521cec682a;hb=f804d333c7b5459c3c1a6bfc188ecdc54346be73;hp=667bf90bfcf60cbc342729793756efece7c8b609;hpb=8ccaa22c4f8f4585c5989bee969a75b7ac974032;p=libfirm

diff --git a/ir/be/becopyopt.c b/ir/be/becopyopt.c
index 667bf90bf..d45ba4ca8 100644
--- a/ir/be/becopyopt.c
+++ b/ir/be/becopyopt.c
@@ -15,184 +15,245 @@
 #endif
 
 #include "irprog.h"
+#include "irloop_t.h"
 
 #include "xmalloc.h"
+#include "beutil.h"
 #include "bechordal_t.h"
 #include "becopyopt.h"
 #include "becopystat.h"
 
-#define DEBUG_LVL 0 //SET_LEVEL_1
 static firm_dbg_module_t *dbg = NULL;
 
-#define is_curr_reg_class(irn) (arch_get_irn_reg_class(co->chordal_env->arch_env, irn, arch_pos_make_out(0)) == co->chordal_env->cls)
+#define is_curr_reg_class(irn) \
+  (arch_get_irn_reg_class(get_arch_env(co), \
+                          irn, -1) == co->chordal_env->cls)
 
 #define MIN(a,b) ((a<b)?(a):(b))
+#define MAX(a,b) ((a<b)?(b):(a))
+
 
 /**
- * Computes a 'max independent set' wrt. ifg-edges only (no coloring conflicts, no register constraints)
- * @return The size of such a mis
- * NOTE: Code adapted from becopyheur
- * BETTER: Here we can be sure having a chordal graph to work on, so for 'larger' opt-units we
- *         could use a special algorithm.
+ * Determines a maximum weighted independent set with respect to
+ * the interference and conflict edges of all nodes in a qnode.
  */
-static int get_ifg_mis_size(unit_t *ou) {
-	int all_size, curr_size, i, o;
-	int *which;
-	ir_node **curr, **all = alloca(ou->node_count * sizeof(*all));
-
-	/* all contains all nodes */
-	all_size = 0;
-	for (i=0; i<ou->node_count; ++i)
-		all[all_size++] = ou->nodes[i];
-
-	/* which[i] says which element to take out of all[] and put into curr[i] */
-	which = alloca(all_size*sizeof(*which));
-	for (curr_size=0; curr_size<all_size; ++curr_size)
-		which[curr_size] = curr_size;
-
-	/* stores the currently examined set */
-	curr = alloca(all_size*sizeof(*curr));
-
-	while (1) { /* this loop will terminate because at least a single node will be a max indep. set */
-		/* build current set */
-		for (i=0; i<curr_size; ++i)
-			curr[i] = all[which[all_size-curr_size+i]];
-
-		/* check current set */
-		for (i=0; i<curr_size; ++i)
-			for (o=i+1; o<curr_size; ++o)
-				if (nodes_interfere(ou->co->chordal_env, curr[i], curr[o]))
-					goto conflict_found;
-
-		/* We had no conflict. This is the (one) max indep. set */
-		return curr_size;
-
-conflict_found:
-		/* We had a conflict. Generate next set */
-		if (which[all_size-curr_size+1] == all_size-curr_size+1) {
-			curr_size--;
-			for (i=0; i<curr_size; ++i)
-				which[all_size-curr_size+i] = i;
-		} else {
-			int redo = 1;
-			while (redo) {
-				int pos = all_size;
-				do {
-					pos--;
-				} while (!(which[pos] = (which[pos]+1) % all_size));
-
-				for (i=pos+1; i<all_size; ++i)
-					which[i] = MIN(which[i-1]+1, all_size-1);
-
-				redo = 0;
-				for (i=all_size-curr_size; i<all_size-1; ++i)
-					if (which[i]>=which[i+1]) {
-						redo = 1;
-						break;
-					}
+static int ou_max_ind_set_costs(unit_t *ou) {
+	be_chordal_env_t *chordal_env = ou->co->chordal_env;
+	ir_node **safe, **unsafe;
+	int i, o, safe_count, safe_costs, unsafe_count, *unsafe_costs;
+	bitset_t *curr;
+	int max, pos, curr_weight, best_weight = 0;
+
+	/* assign the nodes into two groups.
+	 * safe: node has no interference, hence it is in every max stable set.
+	 * unsafe: node has an interference
+	 */
+	safe = alloca((ou->node_count-1) * sizeof(*safe));
+	safe_costs = 0;
+	safe_count = 0;
+	unsafe = alloca((ou->node_count-1) * sizeof(*unsafe));
+	unsafe_costs = alloca((ou->node_count-1) * sizeof(*unsafe_costs));
+	unsafe_count = 0;
+	for(i=1; i<ou->node_count; ++i) {
+		int is_safe = 1;
+		for(o=1; o<ou->node_count; ++o) {
+			if (i==o)
+				continue;
+			if (nodes_interfere(chordal_env, ou->nodes[i], ou->nodes[o])) {
+				unsafe_costs[unsafe_count] = ou->costs[i];
+				unsafe[unsafe_count] = ou->nodes[i];
+				++unsafe_count;
+				is_safe = 0;
+				break;
+			}
+		}
+		if (is_safe) {
+			safe_costs += ou->costs[i];
+			safe[safe_count++] = ou->nodes[i];
+		}
+	}
+
+
+	/* now compute the best set out of the unsafe nodes*/
+	if (unsafe_count > MIS_HEUR_TRIGGER) {
+		bitset_t *best = bitset_alloca(unsafe_count);
+		/* Heuristik: Greedy trial and error form index 0 to unsafe_count-1 */
+		for (i=0; i<unsafe_count; ++i) {
+			bitset_set(best, i);
+			/* check if it is a stable set */
+			for (o=bitset_next_set(best, 0); o!=-1 && o<i; o=bitset_next_set(best, o+1))
+				if (nodes_interfere(chordal_env, unsafe[i], unsafe[o])) {
+					bitset_clear(best, i); /* clear the bit and try next one */
+					break;
+				}
+		}
+		/* compute the weight */
+		bitset_foreach(best, pos)
+			best_weight += unsafe_costs[pos];
+	} else {
+		/* Exact Algorithm: Brute force */
+		curr = bitset_alloca(unsafe_count);
+		bitset_set_all(curr);
+		while ((max = bitset_popcnt(curr)) != 0) {
+			/* check if curr is a stable set */
+			for (i=bitset_next_set(curr, 0); i!=-1; i=bitset_next_set(curr, i+1))
+				for (o=bitset_next_set(curr, i+1); o!=-1; o=bitset_next_set(curr, o+1)) /* !!!!! difference to qnode_max_ind_set(): NOT (curr, i) */
+						if (nodes_interfere(chordal_env, unsafe[i], unsafe[o]))
+							goto no_stable_set;
+
+			/* if we arrive here, we have a stable set */
+			/* compute the weigth of the stable set*/
+			curr_weight = 0;
+			bitset_foreach(curr, pos)
+				curr_weight += unsafe_costs[pos];
+
+			/* any better ? */
+			if (curr_weight > best_weight) {
+				best_weight = curr_weight;
 			}
+
+	no_stable_set:
+			bitset_minus1(curr);
 		}
 	}
-	assert(0 && "How did you get here?");
+
+	return safe_costs+best_weight;
 }
 
-/**
- * Builds an optimization unit for a given optimizable irn (root).
- * This opt-unit is inserted in the main structure co.
- * If an arg of root itself is optimizable process this arg before with a
- * recursive call. For handling this situation and loops co->root is used
- * to remember all roots.
- */
-static void co_append_unit(copy_opt_t *co, ir_node *root) {
-	int i, arity;
+static void co_collect_units(ir_node *irn, void *env) {
+	copy_opt_t *co = env;
 	unit_t *unit;
-	DBG((dbg, LEVEL_1, "\t  Root: %n %N\n", root, root));
-	/* check if we encountered this root earlier */
-	if (pset_find_ptr(co->roots, root))
-		return;
-	pset_insert_ptr(co->roots, root);
+	arch_register_req_t req;
 
-	assert(is_curr_reg_class(root) && "node is in wrong register class!");
+	if (!is_curr_reg_class(irn))
+		return;
+	if (!is_optimizable(get_arch_env(co), irn, &req))
+		return;
 
-	/* init unit */
-	arity = get_irn_arity(root);
+	/* Init a new unit */
 	unit = xcalloc(1, sizeof(*unit));
 	unit->co = co;
-	unit->interf = 0;
 	unit->node_count = 1;
-	unit->nodes = xmalloc((arity+1) * sizeof(*unit->nodes));
-	unit->nodes[0] = root;
 	INIT_LIST_HEAD(&unit->queue);
 
-	/* check all args */
-	if (is_Phi(root)) {
+	/* Phi with some/all of its arguments */
+	if (is_Reg_Phi(irn)) {
+		int i, arity;
+
+		/* init */
+		arity = get_irn_arity(irn);
+		unit->nodes = xmalloc((arity+1) * sizeof(*unit->nodes));
+		unit->costs = xmalloc((arity+1) * sizeof(*unit->costs));
+		unit->nodes[0] = irn;
+
+		/* fill */
 		for (i=0; i<arity; ++i) {
-			ir_node *arg = get_irn_n(root, i);
+			int o, arg_pos;
+			ir_node *arg = get_irn_n(irn, i);
+
 			assert(is_curr_reg_class(arg) && "Argument not in same register class.");
-			if (arg != root) {
-				if (!nodes_interfere(co->chordal_env, root, arg)) {
-					DBG((dbg, LEVEL_1, "\t   Member: %n %N\n", arg, arg));
-					if (is_optimizable(co->chordal_env->arch_env, arg))
-						co_append_unit(co, arg);
-					unit->nodes[unit->node_count++] = arg;
-				} else
-					unit->interf++;
+			if (arg == irn)
+				continue;
+			if (nodes_interfere(co->chordal_env, irn, arg)) {
+				unit->inevitable_costs += co->get_costs(irn, arg, i);
+				continue;
+			}
+
+			/* Else insert the argument of the phi to the members of this ou */
+			DBG((dbg, LEVEL_1, "\t   Member: %+F\n", arg));
+
+			/* Check if arg has occurred at a prior position in the arg/list */
+			arg_pos = 0;
+			for (o=0; o<unit->node_count; ++o)
+				if (unit->nodes[o] == arg) {
+					arg_pos = o;
+					break;
+				}
+
+			if (!arg_pos) { /* a new argument */
+				/* insert node, set costs */
+				unit->nodes[unit->node_count] = arg;
+				unit->costs[unit->node_count] = co->get_costs(irn, arg, i);
+				unit->node_count++;
+			} else { /* arg has occured before in same phi */
+				/* increase costs for existing arg */
+				unit->costs[arg_pos] += co->get_costs(irn, arg, i);
 			}
 		}
 		unit->nodes = xrealloc(unit->nodes, unit->node_count * sizeof(*unit->nodes));
-	} else if (is_Copy(co->chordal_env->arch_env, root)) {
-		assert(!nodes_interfere(co->chordal_env, root, get_Copy_src(root)));
-		unit->nodes[unit->node_count++] = get_Copy_src(root);
-		unit->nodes = xrealloc(unit->nodes, 2 * sizeof(*unit->nodes));
+		unit->costs = xrealloc(unit->costs, unit->node_count * sizeof(*unit->costs));
+	} else
+
+	/* Proj of a perm with corresponding arg */
+	if (is_Perm_Proj(get_arch_env(co), irn)) {
+		assert(!nodes_interfere(co->chordal_env, irn, get_Copy_src(irn)));
+		unit->nodes = xmalloc(2 * sizeof(*unit->nodes));
+		unit->costs = xmalloc(2 * sizeof(*unit->costs));
+		unit->node_count = 2;
+		unit->nodes[0] = irn;
+		unit->nodes[1] = get_Copy_src(irn);
+		unit->costs[1] = co->get_costs(irn, unit->nodes[1], -1);
+	} else
+
+	/* Src == Tgt of a 2-addr-code instruction */
+	if (is_2addr_code(get_arch_env(co), irn, &req)) {
+		ir_node *other = req.other;
+		if (!nodes_interfere(co->chordal_env, irn, other)) {
+			unit->nodes = xmalloc(2 * sizeof(*unit->nodes));
+			unit->costs = xmalloc(2 * sizeof(*unit->costs));
+			unit->node_count = 2;
+			unit->nodes[0] = irn;
+			unit->nodes[1] = other;
+			unit->costs[1] = co->get_costs(irn, other, -120480);
+		}
 	} else
 		assert(0 && "This is not an optimizable node!");
 
-	list_add_tail(&unit->units, &co->units);
-	/* Init ifg_mis_size to node_count. So get_lower_bound returns correct results. */
-	unit->ifg_mis_size = get_ifg_mis_size(unit);
-}
+	/* Insert the new unit at a position according to its costs */
+	if (unit->node_count > 1) {
+		int i;
+		struct list_head *tmp;
 
-static void co_collect_in_block(ir_node *block, void *env) {
-	copy_opt_t *co = env;
-	struct list_head *head = get_block_border_head(co->chordal_env, block);
-	border_t *curr;
+		/* Determine the maximum costs this unit can cause: all_nodes_cost */
+		for(i=1; i<unit->node_count; ++i) {
+			unit->sort_key = MAX(unit->sort_key, unit->costs[i]);
+			unit->all_nodes_costs += unit->costs[i];
+		}
 
-	list_for_each_entry_reverse(border_t, curr, head, list)
-		if (curr->is_def && curr->is_real && is_optimizable(co->chordal_env->arch_env, curr->irn))
-			co_append_unit(co, curr->irn);
-}
+		/* Determine the minimal costs this unit will cause: min_nodes_costs */
+		unit->min_nodes_costs += unit->all_nodes_costs - ou_max_ind_set_costs(unit);
 
-static void co_collect_units(copy_opt_t *co) {
-	DBG((dbg, LEVEL_1, "\tCollecting optimization units\n"));
-	co->roots = pset_new_ptr(64);
-	dom_tree_walk_irg(co->chordal_env->irg, co_collect_in_block, NULL, co);
-	del_pset(co->roots);
+		/* Insert the new ou according to its sort_key */
+		tmp = &co->units;
+		while (tmp->next != &co->units && list_entry_units(tmp->next)->sort_key > unit->sort_key)
+			tmp = tmp->next;
+		list_add(&unit->units, tmp);
+	} else {
+		free(unit);
+	}
 }
 
-copy_opt_t *new_copy_opt(be_chordal_env_t *chordal_env) {
+copy_opt_t *new_copy_opt(be_chordal_env_t *chordal_env, int (*get_costs)(ir_node*, ir_node*, int)) {
 	const char *s1, *s2, *s3;
 	int len;
-        copy_opt_t *co;
+	copy_opt_t *co;
 
 	dbg = firm_dbg_register("ir.be.copyopt");
-	firm_dbg_set_mask(dbg, DEBUG_LVL);
 
 	co = xcalloc(1, sizeof(*co));
 	co->chordal_env = chordal_env;
+	co->get_costs = get_costs;
 
 	s1 = get_irp_prog_name();
-	s2 = get_entity_name(get_irg_entity(co->chordal_env->irg));
+	s2 = get_entity_name(get_irg_entity(get_irg(co)));
 	s3 = chordal_env->cls->name;
 	len = strlen(s1) + strlen(s2) + strlen(s3) + 5;
 	co->name = xmalloc(len);
 	snprintf(co->name, len, "%s__%s__%s", s1, s2, s3);
-	if (!strcmp(co->name, DEBUG_IRG))
-		firm_dbg_set_mask(dbg, DEBUG_LVL_CO);
-	else
-		firm_dbg_set_mask(dbg, DEBUG_LVL);
 
+	DBG((dbg, LEVEL_1, "\tCollecting optimization units\n"));
 	INIT_LIST_HEAD(&co->units);
-	co_collect_units(co);
+	irg_walk_graph(get_irg(co), co_collect_units, NULL, co);
 	return co;
 }
 
@@ -201,89 +262,98 @@ void free_copy_opt(copy_opt_t *co) {
 	xfree(co->name);
 	list_for_each_entry_safe(unit_t, curr, tmp, &co->units, units) {
 		xfree(curr->nodes);
+		xfree(curr->costs);
 		xfree(curr);
 	}
 }
 
 int is_optimizable_arg(const copy_opt_t *co, ir_node *irn) {
-	int i, max;
-	for(i=0, max=get_irn_n_outs(irn); i<max; ++i) {
-		ir_node *n = get_irn_out(irn, i);
-		if ((is_Phi(n) || is_Perm(co->chordal_env->arch_env, n)) && (irn == n || !nodes_interfere(co->chordal_env, irn, n)))
-			return 1;
+	arch_env_t *aenv = co->chordal_env->main_env->arch_env;
+	const ir_edge_t *edge;
+
+	foreach_out_edge(irn, edge) {
+		ir_node *n = edge->src;
+		arch_register_req_t req;
+
+		arch_get_register_req(aenv, &req, n, -1);
+
+		if(	(	(req.type == arch_register_req_type_should_be_same && req.other == irn) ||
+				is_Reg_Phi(n) ||
+				is_Perm(get_arch_env(co), n)
+			) && (irn == n || !nodes_interfere(co->chordal_env, irn, n)))
+				return 1;
 	}
+
 	return 0;
 }
 
-int co_get_copy_count(const copy_opt_t *co) {
+int get_costs_loop_depth(ir_node *root, ir_node* arg, int pos) {
+	int cost = 0;
+	ir_loop *loop;
+	ir_node *root_block = get_nodes_block(root);
+
+	if (is_Phi(root)) {
+		/* for phis the copies are placed in the corresponding pred-block */
+		loop = get_irn_loop(get_Block_cfgpred_block(root_block, pos));
+	} else {
+		/* a perm places the copy in the same block as it resides */
+		loop = get_irn_loop(root_block);
+	}
+	if (loop) {
+		int d = get_loop_depth(loop);
+		cost = d*d;
+	}
+	return cost+1;
+}
+
+int get_costs_all_one(ir_node *root, ir_node* arg, int pos) {
+	return 1;
+}
+
+int co_get_max_copy_costs(const copy_opt_t *co) {
 	int i, res = 0;
 	unit_t *curr;
+
 	list_for_each_entry(unit_t, curr, &co->units, units) {
-		int root_col = get_irn_col(co, curr->nodes[0]);
-		res += curr->interf;
-		DBG((dbg, LEVEL_1, "%n %N has %d intf\n", curr->nodes[0], curr->nodes[0], curr->interf));
+		res += curr->inevitable_costs;
 		for (i=1; i<curr->node_count; ++i)
-			if (root_col != get_irn_col(co, curr->nodes[i])) {
-				DBG((dbg, LEVEL_1, "  %n %N\n", curr->nodes[i], curr->nodes[i]));
-				res++;
-			}
+			res += curr->costs[i];
 	}
 	return res;
 }
 
-int co_get_lower_bound(const copy_opt_t *co) {
+int co_get_inevit_copy_costs(const copy_opt_t *co) {
 	int res = 0;
 	unit_t *curr;
-	list_for_each_entry(unit_t, curr, &co->units, units)
-		res += curr->interf + curr->node_count - curr->ifg_mis_size;
-	return res;
-}
 
-int co_get_interferer_count(const copy_opt_t *co) {
-	int res = 0;
-	unit_t *curr;
 	list_for_each_entry(unit_t, curr, &co->units, units)
-		res += curr->interf;
+		res += curr->inevitable_costs;
 	return res;
 }
 
-/**
- * Needed for result checking
- */
-static void co_collect_for_checker(ir_node *block, void *env) {
-	copy_opt_t *co = env;
-	struct list_head *head = get_block_border_head(co->chordal_env, block);
-	border_t *curr;
-
-	list_for_each_entry_reverse(border_t, curr, head, list)
-		if (curr->is_def && curr->is_real && is_curr_reg_class(curr->irn))
-			obstack_ptr_grow(&co->ob, curr->irn);
-}
+int co_get_copy_costs(const copy_opt_t *co) {
+	int i, res = 0;
+	unit_t *curr;
 
-/**
- * This O(n^2) checker checks if
- * 	two ifg-connected nodes have the same color
- * 	register constraint are satisfied
- */
-void co_check_allocation(copy_opt_t *co) {
-	ir_node **nodes, *n1, *n2;
-	int i, o;
-
-	obstack_init(&co->ob);
-	dom_tree_walk_irg(co->chordal_env->irg, co_collect_for_checker, NULL, co);
-	obstack_ptr_grow(&co->ob, NULL);
-
-	nodes = (ir_node **) obstack_finish(&co->ob);
-	for (i = 0, n1 = nodes[i]; n1; n1 = nodes[++i]) {
-		assert(arch_reg_is_allocatable(co->chordal_env->arch_env, n1, arch_pos_make_out(0),
-			arch_get_irn_register(co->chordal_env->arch_env, n1, 0)) && "Constraint does not hold");
-		for (o = i+1, n2 = nodes[o]; n2; n2 = nodes[++o])
-			if (nodes_interfere(co->chordal_env, n1, n2)
-          && get_irn_col(co, n1) == get_irn_col(co, n2)) {
-				DBG((dbg, 0, "Error in graph %s: %n %d  and  %n %d have the same color %d.\n", co->name, n1, get_irn_graph_nr(n1), n2, get_irn_graph_nr(n2), get_irn_col(co, n1)));
-				assert(0 && "Interfering values have the same color!");
+	list_for_each_entry(unit_t, curr, &co->units, units) {
+		int root_col = get_irn_col(co, curr->nodes[0]);
+		DBG((dbg, LEVEL_1, "  %3d costs for root %+F color %d\n", curr->inevitable_costs, curr->nodes[0], root_col));
+		res += curr->inevitable_costs;
+		for (i=1; i<curr->node_count; ++i) {
+			int arg_col = get_irn_col(co, curr->nodes[i]);
+			if (root_col != arg_col) {
+				DBG((dbg, LEVEL_1, "  %3d for arg %+F color %d\n", curr->costs[i], curr->nodes[i], arg_col));
+				res += curr->costs[i];
 			}
+		}
 	}
-	obstack_free(&co->ob, NULL);
-	DBG((dbg, 2, "The checker seems to be happy!\n"));
+	return res;
+}
+
+int co_get_lower_bound(const copy_opt_t *co) {
+	int res = 0;
+	unit_t *curr;
+	list_for_each_entry(unit_t, curr, &co->units, units)
+		res += curr->inevitable_costs + curr->min_nodes_costs;
+	return res;
 }