4 * Copyright: (c) Universitaet Karlsruhe
5 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
21 #include "bechordal_t.h"
22 #include "becopyopt.h"
23 #include "becopystat.h"
25 static firm_dbg_module_t *dbg = NULL;
27 #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)
29 #define MIN(a,b) ((a<b)?(a):(b))
30 #define MAX(a,b) ((a<b)?(b):(a))
33 * Computes the weight of a 'max independent set' wrt. ifg-edges only
34 * (no coloring conflicts, no register constraints)
35 * @return The costs of such a mis
36 * NOTE: Code adapted from becopyheur
37 * BETTER: Here we can be sure having a chordal graph to work on,
38 * so, for 'larger' opt-units we could use a special algorithm.
40 static int ou_max_ind_set_costs(unit_t *ou) {
42 int max, pos, curr_weight, best_weight = 0;
45 irns = alloca((ou->node_count-1) * sizeof(*irns));
46 curr = bitset_alloca(ou->node_count-1);
48 /* brute force the best set */
50 while ((max = bitset_popcnt(curr)) != 0) {
51 /* check if curr is a stable set */
52 int i, o, is_stable_set = 1;
56 bitset_foreach(curr, pos)
57 irns[i++] = ou->nodes[1+pos];
61 for(o=i+1; o<max; ++o) /* !!!!! difference to qnode_max_ind_set(): NOT o=i */
62 if (nodes_interfere(ou->co->chordal_env, irns[i], irns[o])) {
68 /* calc current weigth */
70 bitset_foreach(curr, pos)
71 curr_weight += ou->costs[1+pos];
74 if (curr_weight > best_weight)
75 best_weight = curr_weight;
84 * Builds an optimization unit for a given optimizable irn (root).
85 * This opt-unit is inserted in the main structure co.
86 * If an arg of root itself is optimizable process this arg before with a
87 * recursive call. For handling this situation and loops co->root is used
88 * to remember all roots.
90 static void co_append_unit(copy_opt_t *co, ir_node *root) {
93 struct list_head *tmp;
95 DBG((dbg, LEVEL_1, "\t Root: %n %N\n", root, root));
96 /* check if we encountered this root earlier */
97 if (pset_find_ptr(co->roots, root))
99 pset_insert_ptr(co->roots, root);
101 assert(is_curr_reg_class(root) && "node is in wrong register class!");
104 arity = get_irn_arity(root);
105 unit = xcalloc(1, sizeof(*unit));
107 unit->nodes = xmalloc((arity+1) * sizeof(*unit->nodes));
108 unit->costs = xmalloc((arity+1) * sizeof(*unit->costs));
109 unit->node_count = 1;
110 unit->nodes[0] = root;
111 INIT_LIST_HEAD(&unit->queue);
115 for (i=0; i<arity; ++i) {
117 ir_node *arg = get_irn_n(root, i);
119 assert(is_curr_reg_class(arg) && "Argument not in same register class.");
122 if (nodes_interfere(co->chordal_env, root, arg)) {
123 unit->inevitable_costs += co->get_costs(root, arg, i);
127 /* Else insert the argument of the phi to the members of this ou */
128 DBG((dbg, LEVEL_1, "\t Member: %n %N\n", arg, arg));
130 /* Check if arg has occurred at a prior position in the arg/list */
131 for (o=0; o<unit->node_count; ++o)
132 if (unit->nodes[o] == arg) {
137 if (!arg_pos) { /* a new argument */
138 /* insert node, set costs */
139 unit->nodes[unit->node_count] = arg;
140 unit->costs[unit->node_count] = co->get_costs(root, arg, i);
142 } else { /* arg has occured before in same phi */
143 /* increase costs for existing arg */
144 unit->costs[arg_pos] += co->get_costs(root, arg, i);
147 unit->nodes = xrealloc(unit->nodes, unit->node_count * sizeof(*unit->nodes));
148 unit->costs = xrealloc(unit->costs, unit->node_count * sizeof(*unit->costs));
149 } else if (is_Copy(co->chordal_env->arch_env, root)) {
150 assert(!nodes_interfere(co->chordal_env, root, get_Copy_src(root)));
151 unit->nodes[1] = get_Copy_src(root);
152 unit->costs[1] = co->get_costs(root, unit->nodes[1], -1);
153 unit->node_count = 2;
154 unit->nodes = xrealloc(unit->nodes, 2 * sizeof(*unit->nodes));
155 unit->costs = xrealloc(unit->costs, 2 * sizeof(*unit->costs));
157 assert(0 && "This is not an optimizable node!");
158 /* TODO add ou's for 2-addr-code instructions */
161 /* Determine the maximum costs this unit can cause: all_nodes_cost */
162 for(i=1; i<unit->node_count; ++i) {
163 unit->sort_key = MAX(unit->sort_key, unit->costs[i]);
164 unit->all_nodes_costs += unit->costs[i];
167 /* Determine the minimal costs this unit will cause: min_nodes_costs */
168 unit->min_nodes_costs += unit->all_nodes_costs - ou_max_ind_set_costs(unit);
170 /* Insert the new ou according to its sort_key */
172 while (tmp->next != &co->units && list_entry_units(tmp->next)->sort_key > unit->sort_key)
174 list_add(&unit->units, tmp);
177 static void co_collect_in_block(ir_node *block, void *env) {
178 copy_opt_t *co = env;
179 struct list_head *head = get_block_border_head(co->chordal_env, block);
182 list_for_each_entry_reverse(border_t, curr, head, list)
183 if (curr->is_def && curr->is_real && is_optimizable(co->chordal_env->arch_env, curr->irn))
184 co_append_unit(co, curr->irn);
187 static void co_collect_units(copy_opt_t *co) {
188 DBG((dbg, LEVEL_1, "\tCollecting optimization units\n"));
189 co->roots = pset_new_ptr(64);
190 dom_tree_walk_irg(co->chordal_env->irg, co_collect_in_block, NULL, co);
194 copy_opt_t *new_copy_opt(be_chordal_env_t *chordal_env, int (*get_costs)(ir_node*, ir_node*, int)) {
195 const char *s1, *s2, *s3;
199 dbg = firm_dbg_register("ir.be.copyopt");
200 firm_dbg_set_mask(dbg, DEBUG_LVL_CO);
202 co = xcalloc(1, sizeof(*co));
203 co->chordal_env = chordal_env;
204 co->get_costs = get_costs;
206 s1 = get_irp_prog_name();
207 s2 = get_entity_name(get_irg_entity(co->chordal_env->irg));
208 s3 = chordal_env->cls->name;
209 len = strlen(s1) + strlen(s2) + strlen(s3) + 5;
210 co->name = xmalloc(len);
211 snprintf(co->name, len, "%s__%s__%s", s1, s2, s3);
212 if (!strcmp(co->name, DEBUG_IRG))
213 firm_dbg_set_mask(dbg, DEBUG_IRG_LVL_CO);
215 firm_dbg_set_mask(dbg, DEBUG_LVL_CO);
217 INIT_LIST_HEAD(&co->units);
218 co_collect_units(co);
222 void free_copy_opt(copy_opt_t *co) {
225 list_for_each_entry_safe(unit_t, curr, tmp, &co->units, units) {
231 int is_optimizable_arg(const copy_opt_t *co, ir_node *irn) {
233 for(i=0, max=get_irn_n_outs(irn); i<max; ++i) {
234 ir_node *n = get_irn_out(irn, i);
235 if ((is_Phi(n) || is_Perm(co->chordal_env->arch_env, n)) && (irn == n || !nodes_interfere(co->chordal_env, irn, n)))
241 int get_costs_loop_depth(ir_node *root, ir_node* arg, int pos) {
244 ir_node *root_block = get_nodes_block(root);
246 assert(pos==-1 || is_Phi(root));
248 /* a perm places the copy in the same block as it resides */
249 loop = get_irn_loop(root_block);
251 /* for phis the copies are placed in the corresponding pred-block */
252 loop = get_irn_loop(get_Block_cfgpred_block(root_block, pos));
255 cost = 2*get_loop_depth(loop);
259 int get_costs_all_one(ir_node *root, ir_node* arg, int pos) {
263 int co_get_copy_costs(const copy_opt_t *co) {
267 list_for_each_entry(unit_t, curr, &co->units, units) {
268 int root_col = get_irn_col(co, curr->nodes[0]);
269 res += curr->inevitable_costs;
270 DBG((dbg, LEVEL_1, " Adding costs for root %+F color %d\n", curr->nodes[0], root_col));
271 for (i=1; i<curr->node_count; ++i) {
272 int arg_col = get_irn_col(co, curr->nodes[i]);
273 if (root_col != arg_col) {
274 DBG((dbg, LEVEL_1, " Arg %+F color %d costs %d\n", curr->nodes[i], arg_col, curr->costs[i]));
275 res += curr->costs[i];
282 int co_get_lower_bound(const copy_opt_t *co) {
285 list_for_each_entry(unit_t, curr, &co->units, units)
286 res += curr->inevitable_costs + curr->min_nodes_costs;