#include "iredges_t.h"
#include "irgwalk.h"
#include "irprintf_t.h"
+#include "irbitset.h"
#include "beutil.h"
#include "belive_t.h"
+#include "besched_t.h"
+
+#define DBG_MODULE "firm.be.liveness"
FIRM_IMPL2(is_live_in, int, const ir_node *, const ir_node *)
FIRM_IMPL2(is_live_out, int, const ir_node *, const ir_node *)
live_irg_data_offset = register_additional_graph_data(sizeof(irn_live_t));
}
+/**
+ * Mark a node as live-in in a block.
+ */
static INLINE void mark_live_in(ir_node *block, const ir_node *irn)
{
_get_or_set_live(block, irn, live_state_in);
}
+/**
+ * Mark a node as live-out in a block.
+ */
static INLINE void mark_live_out(ir_node *block, const ir_node *irn)
{
_get_or_set_live(block, irn, live_state_out | live_state_end);
}
+/**
+ * Mark a node as live-end in a block.
+ */
static INLINE void mark_live_end(ir_node *block, const ir_node *irn)
{
_get_or_set_live(block, irn, live_state_end);
* @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(ir_node *def, ir_node *block,
- pset *visited, int is_true_out)
+static void live_end_at_block(ir_node *def, ir_node *block, bitset_t *visited, int is_true_out)
{
- mark_live_end(block, def);
- if(is_true_out)
- mark_live_out(block, def);
+ mark_live_end(block, def);
+ if(is_true_out)
+ mark_live_out(block, def);
- if(!pset_find_ptr(visited, block)) {
+ if(!bitset_contains_irn(visited, block)) {
+ bitset_add_irn(visited, block);
- pset_insert_ptr(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(get_nodes_block(def) != block) {
- int i, n;
+ mark_live_in(block, def);
- mark_live_in(block, def);
-
- for(i = 0, n = get_irn_arity(block); i < n; ++i)
- live_end_at_block(def, get_Block_cfgpred_block(block, i), visited, 1);
- }
+ for(i = 0, n = get_Block_n_cfgpreds(block); i < n; ++i)
+ live_end_at_block(def, get_Block_cfgpred_block(block, i), visited, 1);
+ }
- }
+ }
}
/**
* @param irn The node (value).
* @param env Ignored.
*/
-static void liveness_for_node(ir_node *irn, void *env)
-{
- const ir_edge_t *edge;
- ir_node *def_block;
- pset *visited;
-
- /* Don't compute liveness information for non-data nodes. */
- if(!is_data_node(irn))
- return;
-
- visited = pset_new_ptr(512);
- def_block = get_nodes_block(irn);
-
- /* Go over all uses of the value */
- foreach_out_edge(irn, edge) {
- ir_node *use = edge->src;
- ir_node *use_block;
-
- /*
- * If the usage is no data node, skip this use, since it does not
- * affect the liveness of the node.
- */
- if(!is_data_node(use))
- continue;
-
- /* Get the block where the usage is in. */
- use_block = get_nodes_block(use);
-
- /*
- * If the use is a phi function, determine the corresponding block
- * through which the value reaches the phi function and mark the
- * value as live out of that block.
- */
- if(is_Phi(use)) {
+static void liveness_for_node(ir_node *irn, void *data)
+{
+ bitset_t *visited = data;
+ const ir_edge_t *edge;
+ ir_node *def_block;
+
+ /* Don't compute liveness information for non-data nodes. */
+ if(!is_data_node(irn))
+ return;
+
+ bitset_clear_all(visited);
+ def_block = get_nodes_block(irn);
+
+ /* Go over all uses of the value */
+ foreach_out_edge(irn, edge) {
+ ir_node *use = edge->src;
+ ir_node *use_block;
+
+ /*
+ * If the usage is no data node, skip this use, since it does not
+ * affect the liveness of the node.
+ */
+ if(!is_data_node(use))
+ continue;
+
+ /* Get the block where the usage is in. */
+ use_block = get_nodes_block(use);
+
+ /*
+ * If the use is a phi function, determine the corresponding block
+ * through which the value reaches the phi function and mark the
+ * value as live out of that block.
+ */
+ if(is_Phi(use)) {
ir_node *pred_block = get_Block_cfgpred_block(use_block, edge->pos);
live_end_at_block(irn, pred_block, visited, 0);
- }
-
- /*
- * Else, the value is live in at this block. Mark it and call live
- * out on the predecessors.
- */
- else if(def_block != use_block) {
- int i, n;
+ }
- mark_live_in(use_block, irn);
+ /*
+ * Else, the value is live in at this block. Mark it and call live
+ * out on the predecessors.
+ */
+ else if(def_block != use_block) {
+ int i, n;
- for(i = 0, n = get_irn_arity(use_block); i < n; ++i) {
- ir_node *pred_block = get_nodes_block(get_irn_n(use_block, i));
- live_end_at_block(irn, pred_block, visited, 1);
- }
- }
- }
+ mark_live_in(use_block, irn);
- del_pset(visited);
+ for(i = 0, n = get_Block_n_cfgpreds(use_block); i < n; ++i) {
+ ir_node *pred_block = get_Block_cfgpred_block(use_block, i);
+ live_end_at_block(irn, pred_block, visited, 1);
+ }
+ }
+ }
}
+/**
+ * Compare two live entries.
+ */
static int cmp_irn_live(const void *a, const void *b, size_t size)
{
const irn_live_t *p = a;
return !(p->block == q->block && p->irn == q->irn);
}
+static int (*old_dump_block_func)(ir_node *self, FILE *F, dump_reason_t reason) = NULL;
+
+static int dump_block_func(ir_node *self, FILE *F, dump_reason_t reason)
+{
+ switch(reason) {
+ case dump_node_opcode_txt:
+ fprintf(F, get_irn_opname(self));
+ break;
+ case dump_node_mode_txt:
+ fprintf(F, get_irn_modename(self));
+ break;
+ case dump_node_nodeattr_txt:
+ break;
+ case dump_node_info_txt:
+ if(!get_irg_live_info(get_irn_irg(self))->live)
+ return 0;
+#if 0
+ fprintf(F, "liveness information:\n");
+ {
+ irn_live_t *li;
+ live_foreach(self, li) {
+ ir_fprintf(F, "%+F", li->irn);
+ if(live_is_in(li))
+ fprintf(F, " in");
+ if(live_is_end(li))
+ fprintf(F, " end");
+ if(live_is_out(li))
+ fprintf(F, " out");
+
+ fprintf(F, "\n");
+ }
+ }
+#endif
+ }
+
+ return 0;
+}
+
+/* Compute the inter block liveness for a graph. */
void be_liveness(ir_graph *irg)
{
- irg_live_info_t *live_info = get_irg_live_info(irg);
- if(live_info->live)
- del_set(live_info->live);
+ bitset_t *visited = bitset_irg_malloc(irg);
+ irg_live_info_t *live_info = get_irg_live_info(irg);
+ if(live_info->live)
+ del_set(live_info->live);
- live_info->live = new_set(cmp_irn_live, 8192);
- irg_walk_graph(irg, liveness_for_node, NULL, NULL);
+ live_info->live = new_set(cmp_irn_live, 8192);
+ irg_walk_graph(irg, liveness_for_node, NULL, visited);
+
+ old_dump_block_func = op_Block->ops.dump_node;
+ op_Block->ops.dump_node = dump_block_func;
+
+ bitset_free(visited);
}
+/**
+ * Pre-walker: dump liveness data to a file
+ */
static void dump_liveness_walker(ir_node *bl, void *data)
{
FILE *f = data;
}
}
+/* Dump the liveness information for a graph. */
void be_liveness_dump(ir_graph *irg, FILE *f)
{
irg_block_walk_graph(irg, dump_liveness_walker, NULL, f);
}
+/* Dump the liveness information for a graph. */
void be_liveness_dumpto(ir_graph *irg, const char *cls_name)
{
FILE *f;
}
}
+/**
+ * Walker: checks the every predecessors of a node dominate
+ * the note.
+ */
static void dom_check(ir_node *irn, void *data)
{
if(!is_Block(irn) && irn != get_irg_end(get_irn_irg(irn))) {
}
}
+/* Check, if the SSA dominance property is fulfilled. */
void be_check_dominance(ir_graph *irg)
{
irg_walk_graph(irg, dom_check, NULL, NULL);
}
+
+pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live)
+{
+ int i, n;
+ ir_node *x;
+ FIRM_DBG_REGISTER(firm_dbg_module_t *dbg, DBG_MODULE);
+
+ DEBUG_ONLY(
+ DBG((dbg, LEVEL_1, "%+F\n", irn));
+ for(x = pset_first(live); x; x = pset_next(live))
+ DBG((dbg, LEVEL_1, "\tlive: %+F\n", x));
+ )
+
+ /* You should better break out of your loop when hitting the first phi function. */
+ assert(!is_Phi(irn) && "liveness_transfer produces invalid results for phi nodes");
+
+ if(arch_irn_consider_in_reg_alloc(arch_env, cls, irn)) {
+ ir_node *del = pset_remove_ptr(live, irn);
+ assert(irn == del);
+ }
+
+ for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ ir_node *op = get_irn_n(irn, i);
+
+ if(arch_irn_consider_in_reg_alloc(arch_env, cls, op))
+ pset_insert_ptr(live, op);
+ }
+
+ return live;
+}
+
+pset *be_liveness_end_of_block(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live)
+{
+ irn_live_t *li;
+
+ live_foreach(bl, li) {
+ ir_node *irn = (ir_node *) li->irn;
+ if(live_is_end(li) && arch_irn_consider_in_reg_alloc(arch_env, cls, irn))
+ pset_insert_ptr(live, irn);
+ }
+
+ return live;
+}
+
+pset *be_liveness_nodes_live_at(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live)
+{
+ const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
+ ir_node *irn;
+
+ be_liveness_end_of_block(arch_env, cls, bl, live);
+ sched_foreach_reverse(bl, irn) {
+ /*
+ * If we encounter the node we want to insert the Perm after,
+ * exit immediately, so that this node is still live
+ */
+ if(irn == pos)
+ return live;
+
+ be_liveness_transfer(arch_env, cls, irn, live);
+ }
+
+ return live;
+}
projects / libfirm / blobdiff