* the interference and conflict edges of all nodes in a qnode.
*/
static INLINE void qnode_max_ind_set(qnode_t *qn, const unit_t *ou) {
- ir_node **irns;
+ ir_node **safe, **unsafe;
+ int i, o, safe_count, safe_costs, unsafe_count, *unsafe_costs;
+ bitset_t *curr, *best;
int max, next, pos, curr_weight, best_weight = 0;
- bitset_t *best, *curr;
- irns = alloca((ou->node_count-1) * sizeof(*irns));
- best = bitset_alloca(ou->node_count-1);
- curr = bitset_alloca(ou->node_count-1);
+ /* 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 (qnode_are_conflicting(qn, ou->nodes[i], ou->nodes[o])) {
+ if (i!=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 brute force the best set out of the unsafe nodes*/
+ best = bitset_alloca(unsafe_count);
+ curr = bitset_alloca(unsafe_count);
- /* brute force the best set */
bitset_set_all(curr);
while ((max = bitset_popcnt(curr)) != 0) {
/* check if curr is a stable set */
- int i, o, is_stable_set = 1;
-
- /* copy the irns */
- i = 0;
+ for (i=bitset_next_set(curr, 0); i!=-1; i=bitset_next_set(curr, i+1))
+ for (o=bitset_next_set(curr, i); o!=-1; o=bitset_next_set(curr, o+1)) /* !!!!! difference to ou_max_ind_set_costs(): NOT (curr, i+1) */
+ if (qnode_are_conflicting(qn, 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)
- irns[i++] = ou->nodes[1+pos];
- assert(i==max);
+ curr_weight += unsafe_costs[pos];
- for(i=0; i<max; ++i)
- for(o=i; o<max; ++o) /* !!!!! difference to ou_max_ind_set_costs(): NOT o=i+1 */
- if (qnode_are_conflicting(qn, irns[i], irns[o])) {
- is_stable_set = 0;
- break;
- }
-
- if (is_stable_set) {
- /* calc current weigth */
- curr_weight = 0;
- bitset_foreach(curr, pos)
- curr_weight += ou->costs[1+pos];
-
- /* any better ? */
- if (curr_weight > best_weight) {
- best_weight = curr_weight;
- bitset_copy(best, curr);
- }
+ /* any better ? */
+ if (curr_weight > best_weight) {
+ best_weight = curr_weight;
+ bitset_copy(best, curr);
}
+no_stable_set:
bitset_minus1(curr);
}
/* transfer the best set into the qn */
- qn->mis_size = bitset_popcnt(best)+1;
- qn->mis_costs = best_weight;
- next = 0;
- qn->mis[next++] = ou->nodes[0]; /* the root is alwazs in a max stable set */
+ qn->mis_size = 1+safe_count+bitset_popcnt(best);
+ qn->mis_costs = safe_costs+best_weight;
+ qn->mis[0] = ou->nodes[0]; /* the root is alwazs in a max stable set */
+ next = 1;
+ for (i=0; i<safe_count; ++i)
+ qn->mis[next++] = safe[i];
bitset_foreach(best, pos)
- qn->mis[next++] = ou->nodes[1+pos];
+ qn->mis[next++] = unsafe[pos];
}
/**
#define MIN(a,b) ((a<b)?(a):(b))
#define MAX(a,b) ((a<b)?(b):(a))
+
/**
- * Computes the weight of a 'max independent set' wrt. ifg-edges only
- * (no coloring conflicts, no register constraints)
- * @return The costs 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 ou_max_ind_set_costs(unit_t *ou) {
- ir_node **irns;
- int max, pos, curr_weight, best_weight = 0;
+ 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];
+ }
+ }
- irns = alloca((ou->node_count-1) * sizeof(*irns));
- curr = bitset_alloca(ou->node_count-1);
- /* brute force the best set */
+
+ /* now brute force the best set out of the unsafe nodes*/
+ curr = bitset_alloca(unsafe_count);
+
bitset_set_all(curr);
while ((max = bitset_popcnt(curr)) != 0) {
/* check if curr is a stable set */
- int i, o, is_stable_set = 1;
-
- /* copy the irns */
- i = 0;
+ 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)
- irns[i++] = ou->nodes[1+pos];
- assert(i==max);
-
- for(i=0; i<max; ++i)
- for(o=i+1; o<max; ++o) /* !!!!! difference to qnode_max_ind_set(): NOT o=i */
- if (nodes_interfere(ou->co->chordal_env, irns[i], irns[o])) {
- is_stable_set = 0;
- break;
- }
+ curr_weight += unsafe_costs[pos];
- if (is_stable_set) {
- /* calc current weigth */
- curr_weight = 0;
- bitset_foreach(curr, pos)
- curr_weight += ou->costs[1+pos];
-
- /* any better ? */
- if (curr_weight > best_weight)
- best_weight = curr_weight;
+ /* any better ? */
+ if (curr_weight > best_weight) {
+ best_weight = curr_weight;
}
+no_stable_set:
bitset_minus1(curr);
}
- return best_weight;
+
+ return safe_costs+best_weight;
}
/**
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;
- DBG((dbg, LEVEL_1, " Adding costs for root %+F color %d\n", curr->nodes[0], root_col));
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, " Arg %+F color %d costs %d\n", curr->nodes[i], arg_col, curr->costs[i]));
+ DBG((dbg, LEVEL_1, " %3d for arg %+F color %d\n", curr->costs[i], curr->nodes[i], arg_col));
res += curr->costs[i];
}
}
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