#include "irloop_t.h"
#include "xmalloc.h"
+#include "beutil.h"
#include "bechordal_t.h"
#include "becopyopt.h"
#include "becopystat.h"
#define is_curr_reg_class(irn) \
(arch_get_irn_reg_class(get_arch_env(co), \
- irn, arch_pos_make_out(0)) == co->chordal_env->cls)
+ irn, -1) == co->chordal_env->cls)
#define MIN(a,b) ((a<b)?(a):(b))
#define MAX(a,b) ((a<b)?(b):(a))
/**
* Determines a maximum weighted independent set with respect to
* the interference and conflict edges of all nodes in a qnode.
- * TODO: This runs in 2^n in worst case. Use a heuristic iff n>???
*/
static int ou_max_ind_set_costs(unit_t *ou) {
be_chordal_env_t *chordal_env = ou->co->chordal_env;
}
-
- /* 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 */
- 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;
+ /* 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);
+ no_stable_set:
+ bitset_minus1(curr);
+ }
}
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;
- struct list_head *tmp;
+ arch_register_req_t req;
- 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))
+ if (!is_curr_reg_class(irn))
+ return;
+ if (!is_optimizable(get_arch_env(co), irn, &req))
return;
- pset_insert_ptr(co->roots, root);
-
- assert(is_curr_reg_class(root) && "node is in wrong register class!");
- /* init unit */
- arity = get_irn_arity(root);
+ /* Init a new unit */
unit = xcalloc(1, sizeof(*unit));
unit->co = co;
- unit->nodes = xmalloc((arity+1) * sizeof(*unit->nodes));
- unit->costs = xmalloc((arity+1) * sizeof(*unit->costs));
unit->node_count = 1;
- unit->nodes[0] = root;
INIT_LIST_HEAD(&unit->queue);
- /* check all args */
- if (is_Phi(root) && mode_is_datab(get_irn_mode(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) {
- int o, arg_pos = 0;
- 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 (arg == irn)
continue;
- if (nodes_interfere(co->chordal_env, root, arg)) {
- unit->inevitable_costs += co->get_costs(root, arg, i);
+ 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: %n %N\n", arg, arg));
+ 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;
if (!arg_pos) { /* a new argument */
/* insert node, set costs */
unit->nodes[unit->node_count] = arg;
- unit->costs[unit->node_count] = co->get_costs(root, arg, i);
+ 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(root, arg, i);
+ unit->costs[arg_pos] += co->get_costs(irn, arg, i);
}
}
unit->nodes = xrealloc(unit->nodes, unit->node_count * sizeof(*unit->nodes));
unit->costs = xrealloc(unit->costs, unit->node_count * sizeof(*unit->costs));
- } else if (is_Copy(get_arch_env(co), root)) {
- assert(!nodes_interfere(co->chordal_env, root, get_Copy_src(root)));
- unit->nodes[1] = get_Copy_src(root);
- unit->costs[1] = co->get_costs(root, unit->nodes[1], -1);
- unit->node_count = 2;
- unit->nodes = xrealloc(unit->nodes, 2 * sizeof(*unit->nodes));
- unit->costs = xrealloc(unit->costs, 2 * sizeof(*unit->costs));
} else
- assert(0 && "This is not an optimizable node!");
- /* TODO add ou's for 2-addr-code instructions */
-
- /* 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];
- }
+ /* 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
- /* 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);
+ /* 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!");
- /* 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);
-}
+ /* 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(get_arch_env(co), 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(get_irg(co), 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, int (*get_costs)(ir_node*, ir_node*, int)) {
copy_opt_t *co;
dbg = firm_dbg_register("ir.be.copyopt");
- firm_dbg_set_mask(dbg, DEBUG_LVL_CO);
co = xcalloc(1, sizeof(*co));
co->chordal_env = chordal_env;
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_IRG_LVL_CO);
- else
- firm_dbg_set_mask(dbg, DEBUG_LVL_CO);
+ 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;
}
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) && mode_is_datab(get_irn_mode(n))) ||
- is_Perm(get_arch_env(co), 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;
}
ir_loop *loop;
ir_node *root_block = get_nodes_block(root);
- assert(pos==-1 || is_Phi(root));
- if (pos == -1) {
- /* a perm places the copy in the same block as it resides */
- loop = get_irn_loop(root_block);
- } else {
+ 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);
projects / libfirm / blobdiff