DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
-/* see comment in compute_liveness() */
-#define LV_COMPUTE_SORTED
#define LV_STD_SIZE 64
+
+/* if defined, use binary search for already live nodes, else linear */
#define LV_USE_BINARY_SEARCH
#undef LV_INTESIVE_CHECKS
register_node(lv, irn);
}
+static struct {
+ be_lv_t *lv; /**< The liveness object. */
+ ir_node *def; /**< The node (value). */
+ ir_node *def_block; /**< The block of def. */
+ bitset_t *visited; /**< A set were all visited blocks are recorded. */
+} re;
+
/**
* Mark a node (value) live out at a certain block. Do this also
* transitively, i.e. if the block is not the block of the value's
* definition, all predecessors are also marked live.
- * @param def The node (value).
* @param block The block to mark the value live out of.
- * @param visited A set were all visited blocks are recorded.
* @param is_true_out Is the node real out there or only live at the end
* of the block.
*/
-static void live_end_at_block(be_lv_t *lv, ir_node *def, ir_node *block, bitset_t *visited, int is_true_out)
+static void live_end_at_block(ir_node *block, int is_true_out)
{
+ be_lv_t *lv = re.lv;
+ ir_node *def = re.def;
+ bitset_t *visited;
+
mark_live_end(lv, block, def);
- if(is_true_out)
+ if (is_true_out)
mark_live_out(lv, block, def);
- if(!bitset_contains_irn(visited, block)) {
+ visited = re.visited;
+ if (!bitset_contains_irn(visited, block)) {
bitset_add_irn(visited, block);
/*
- * If this block is not the definition block, we have to go up
- * further.
- */
- if(get_nodes_block(def) != block) {
- int i, n;
+ * If this block is not the definition block, we have to go up
+ * further.
+ */
+ if (re.def_block != block) {
+ int i;
mark_live_in(lv, block, def);
- for(i = 0, n = get_Block_n_cfgpreds(block); i < n; ++i)
- live_end_at_block(lv, def, get_Block_cfgpred_block(block, i), visited, 1);
+ for (i = get_Block_n_cfgpreds(block) - 1; i >= 0; --i)
+ live_end_at_block(get_Block_cfgpred_block(block, i), 1);
}
-
}
}
* Liveness analysis for a value.
* Compute the set of all blocks a value is live in.
* @param irn The node (value).
- * @param walker walker data
*/
-static void liveness_for_node(ir_node *irn, lv_walker_t *walker)
+static void liveness_for_node(ir_node *irn)
{
- be_lv_t *lv = walker->lv;
- bitset_t *visited = walker->data;
const ir_edge_t *edge;
ir_node *def_block;
- bitset_clear_all(visited);
+ bitset_clear_all(re.visited);
def_block = get_nodes_block(irn);
+ re.def = irn;
+ re.def_block = def_block;
+
/* Go over all uses of the value */
foreach_out_edge(irn, edge) {
ir_node *use = edge->src;
*/
if (is_Phi(use)) {
ir_node *pred_block = get_Block_cfgpred_block(use_block, edge->pos);
- live_end_at_block(lv, irn, pred_block, visited, 0);
+ live_end_at_block(pred_block, 0);
}
/*
* out on the predecessors.
*/
else if (def_block != use_block) {
- int i, n;
+ int i;
- mark_live_in(lv, use_block, irn);
+ mark_live_in(re.lv, use_block, irn);
- for (i = 0, n = get_Block_n_cfgpreds(use_block); i < n; ++i) {
+ for (i = get_Block_n_cfgpreds(use_block) - 1; i >= 0; --i) {
ir_node *pred_block = get_Block_cfgpred_block(use_block, i);
- live_end_at_block(lv, irn, pred_block, visited, 1);
+ live_end_at_block(pred_block, 1);
}
}
}
*/
static void collect_liveness_nodes(ir_node *irn, void *data)
{
- struct obstack *obst = data;
+ ir_node **nodes = data;
if (is_liveness_node(irn))
- obstack_ptr_grow(obst, irn);
+ nodes[get_irn_idx(irn)] = irn;
}
-#ifdef LV_COMPUTE_SORTED
-/**
- * Compare two nodes by its node index.
- */
-static int node_idx_cmp(const void *a, const void *b)
-{
- const ir_node *p = *(ir_node **) a;
- const ir_node *q = *(ir_node **) b;
- int ia = get_irn_idx(p);
- int ib = get_irn_idx(q);
- return ia - ib;
-}
-#endif /* LV_COMPUTE_SORTED */
-
static void compute_liveness(be_lv_t *lv)
{
- struct obstack obst;
- lv_walker_t w;
ir_node **nodes;
int i, n;
stat_ev_tim_push();
- obstack_init(&obst);
- irg_walk_graph(lv->irg, NULL, collect_liveness_nodes, &obst);
- n = obstack_object_size(&obst) / sizeof(nodes[0]);
- nodes = obstack_finish(&obst);
+ n = get_irg_last_idx(lv->irg);
+ nodes = NEW_ARR_F(ir_node *, n);
+ memset(nodes, 0, sizeof(nodes[0]) * n);
/*
* inserting the variables sorted by their ID is probably
* more efficient since the binary sorted set insertion
* will not need to move around the data.
- * However, if sorting the variables a priori pays off
- * needs to be checked, hence the define.
*/
-#ifdef LV_COMPUTE_SORTED
- qsort(nodes, n, sizeof(nodes[0]), node_idx_cmp);
-#endif
+ irg_walk_graph(lv->irg, NULL, collect_liveness_nodes, nodes);
- w.lv = lv;
- w.data = bitset_obstack_alloc(&obst, get_irg_last_idx(lv->irg));
+ re.lv = lv;
+ re.visited = bitset_malloc(n);
- for (i = 0; i < n; ++i)
- liveness_for_node(nodes[i], &w);
+ for (i = 0; i < n; ++i) {
+ if (nodes[i] != NULL)
+ liveness_for_node(nodes[i]);
+ }
- obstack_free(&obst, NULL);
+ DEL_ARR_F(nodes);
+ free(re.visited);
register_hook(hook_node_info, &lv->hook_info);
stat_ev_tim_pop("be_lv_sets_cons");
}
{
/* Don't compute liveness information for non-data nodes. */
if (lv->nodes && is_liveness_node(irn)) {
- lv_walker_t w;
- w.lv = lv;
- w.data = bitset_malloc(get_irg_last_idx(lv->irg));
- liveness_for_node(irn, &w);
- bitset_free(w.data);
+ re.lv = lv;
+ re.visited = bitset_malloc(get_irg_last_idx(lv->irg));
+ liveness_for_node(irn);
+ bitset_free(re.visited);
}
}