set *changed_nodes; /**< contains node_stat_t's. */
} qnode_t;
-pset *pinned_global; /**< optimized nodes should not be altered any more */
+static pset *pinned_global; /**< optimized nodes should not be altered any more */
static int set_cmp_conflict_t(const void *x, const void *y, size_t size) {
const conflict_t *xx = x;
}
if (!arch_reg_is_allocatable(arch_env,
irn,
- arch_pos_make_out(0),
+ -1,
arch_register_for_index(cls, col)))
goto ret_imposs;
pset *live_ins = put_live_in(irn_bl, pset_new_ptr_default());
for (n = pset_first(live_ins); n; n = pset_next(live_ins)) {
DBG((dbg, LEVEL_4, "Checking %+F which is live-in at the block\n", n));
- if (arch_irn_has_reg_class(arch_env, n, arch_pos_make_out(0), cls)
+ if (arch_irn_has_reg_class(arch_env, n, -1, cls)
&& n != trigger && qnode_get_new_color(qn, n) == col
&& nodes_interfere(chordal_env, irn, n)) {
for (i = 0, max = get_irn_n_outs(curr_bl); i < max; ++i) {
ir_node *n = get_irn_out(curr_bl, i);
DBG((dbg, LEVEL_4, "Checking %+F defined in same block\n", n));
- if (arch_irn_has_reg_class(arch_env, n, arch_pos_make_out(0), cls)
+ if (arch_irn_has_reg_class(arch_env, n, -1, cls)
&& n != trigger && qnode_get_new_color(qn, n) == col
&& nodes_interfere(chordal_env, irn, n)) {
DBG((dbg, LEVEL_4, "\t %+F\ttroubles\n", n));
return 1;
}
+typedef int(*confl_f)(const ir_node *a, const ir_node *b, void *data);
+
+/**
+ * @param result Gets filled with the computed maximum independent set.
+ * @param count The size of input arrays / the number of nodes
+ * @param nodes A set of nodes to copmute the max. ind. set for
+ * @param weights Weights associated to the nodes in @p nodes
+ * @param confl Callback function to decide if two values interfere
+ * @param data Passed into all callbacks
+ * @return The size of the computed set
+ */
+//int max_ind_set(ir_node **result, int count, ir_node **nodes, int *weights, confl_f confl, void *data) {
+//
+//}
+
/**
* Determines a maximum weighted independent set with respect to
* the interference and conflict edges of all nodes in a qnode.
- * TODO: This runs in n! in worst case. Use a heuristic iff n>???
*/
static INLINE void qnode_max_ind_set(qnode_t *qn, const unit_t *ou) {
ir_node **safe, **unsafe;
- /* now brute force the best set out of the unsafe nodes*/
+ /* now compute the best set out of the unsafe nodes*/
best = bitset_alloca(unsafe_count);
- 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); 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)
- curr_weight += unsafe_costs[pos];
-
- /* any better ? */
- if (curr_weight > best_weight) {
- best_weight = curr_weight;
- bitset_copy(best, curr);
+
+ if (unsafe_count > MIS_HEUR_TRIGGER) {
+ /* 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 (qnode_are_conflicting(qn, 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); 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)
+ curr_weight += unsafe_costs[pos];
+
+ /* any better ? */
+ if (curr_weight > best_weight) {
+ best_weight = curr_weight;
+ bitset_copy(best, curr);
+ }
no_stable_set:
- bitset_minus1(curr);
+ bitset_minus1(curr);
+ }
}
/* transfer the best set into the qn */
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 */
+ qn->mis[0] = ou->nodes[0]; /* the root is always in a max stable set */
next = 1;
for (i=0; i<safe_count; ++i)
qn->mis[next++] = safe[i];
*/
static void ou_optimize(unit_t *ou) {
int i;
- qnode_t *curr, *tmp;
+ qnode_t *curr = NULL, *tmp;
bitset_t *pos_regs = bitset_alloca(ou->co->chordal_env->cls->n_regs);
DBG((dbg, LEVEL_1, "\tOptimizing unit:\n"));
/* init queue */
INIT_LIST_HEAD(&ou->queue);
- arch_get_allocatable_regs(get_arch_env(ou->co), ou->nodes[0], arch_pos_make_out(0), ou->co->chordal_env->cls, pos_regs);
+ arch_get_allocatable_regs(get_arch_env(ou->co), ou->nodes[0], -1, ou->co->chordal_env->cls, pos_regs);
bitset_foreach(pos_regs, i)
ou_insert_qnode(ou, new_qnode(ou, i));
projects / libfirm / blobdiff