}
}
+/* Coalesce potential copies via PHI arguments. */
-/* Reduce the number of live ranges in MAP. Live range information is
- returned if FLAGS indicates that we are combining temporaries, otherwise
- NULL is returned. The only partitions which are associated with actual
- variables at this point are those which are forced to be coalesced for
- various reason. (live on entry, live across abnormal edges, etc.). */
-
-static tree_live_info_p
-coalesce_ssa_name (var_map map, int flags)
+static void
+coalesce_phi_operands (var_map map, coalesce_list_p cl)
{
- unsigned num, x, i;
- sbitmap live;
- tree var, phi;
- root_var_p rv;
- tree_live_info_p liveinfo;
- var_ann_t ann;
- conflict_graph graph;
basic_block bb;
- coalesce_list_p cl = NULL;
- sbitmap_iterator sbi;
-
- if (num_var_partitions (map) <= 1)
- return NULL;
-
- liveinfo = calculate_live_on_entry (map);
- calculate_live_on_exit (liveinfo);
- rv = root_var_init (map);
-
- /* Remove single element variable from the list. */
- root_var_compact (rv);
-
- cl = create_coalesce_list (map);
+ tree phi;
- /* Add all potential copies via PHI arguments to the list. */
FOR_EACH_BB (bb)
{
for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
{
tree res = PHI_RESULT (phi);
int p = var_to_partition (map, res);
+ int x;
+
if (p == NO_PARTITION)
continue;
- for (x = 0; x < (unsigned)PHI_NUM_ARGS (phi); x++)
+
+ for (x = 0; x < PHI_NUM_ARGS (phi); x++)
{
tree arg = PHI_ARG_DEF (phi, x);
int p2;
}
}
}
+}
- /* Coalesce all the result decls together. */
- var = NULL_TREE;
- i = 0;
- for (x = 0; x < num_var_partitions (map); x++)
+/* Coalesce all the result decls together. */
+
+static void
+coalesce_result_decls (var_map map, coalesce_list_p cl)
+{
+ unsigned int i, x;
+ tree var = NULL;
+
+ for (i = x = 0; x < num_var_partitions (map); x++)
{
tree p = partition_to_var (map, x);
- if (TREE_CODE (SSA_NAME_VAR(p)) == RESULT_DECL)
+ if (TREE_CODE (SSA_NAME_VAR (p)) == RESULT_DECL)
{
if (var == NULL_TREE)
{
false));
}
}
+}
+
+/* Coalesce matching constraints in asms. */
+
+static void
+coalesce_asm_operands (var_map map, coalesce_list_p cl)
+{
+ basic_block bb;
+
+ FOR_EACH_BB (bb)
+ {
+ block_stmt_iterator bsi;
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ {
+ tree stmt = bsi_stmt (bsi);
+ unsigned long noutputs, i;
+ tree *outputs, link;
+
+ if (TREE_CODE (stmt) != ASM_EXPR)
+ continue;
+
+ noutputs = list_length (ASM_OUTPUTS (stmt));
+ outputs = (tree *) alloca (noutputs * sizeof (tree));
+ for (i = 0, link = ASM_OUTPUTS (stmt); link;
+ ++i, link = TREE_CHAIN (link))
+ outputs[i] = TREE_VALUE (link);
+
+ for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
+ {
+ const char *constraint
+ = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+ tree input = TREE_VALUE (link);
+ char *end;
+ unsigned long match;
+ int p1, p2;
+
+ if (TREE_CODE (input) != SSA_NAME && !DECL_P (input))
+ continue;
+
+ match = strtoul (constraint, &end, 10);
+ if (match >= noutputs || end == constraint)
+ continue;
+
+ if (TREE_CODE (outputs[match]) != SSA_NAME
+ && !DECL_P (outputs[match]))
+ continue;
+
+ p1 = var_to_partition (map, outputs[match]);
+ if (p1 == NO_PARTITION)
+ continue;
+ p2 = var_to_partition (map, input);
+ if (p2 == NO_PARTITION)
+ continue;
+
+ add_coalesce (cl, p1, p2, coalesce_cost (REG_BR_PROB_BASE,
+ maybe_hot_bb_p (bb),
+ false));
+ }
+ }
+ }
+}
+
+/* Reduce the number of live ranges in MAP. Live range information is
+ returned if FLAGS indicates that we are combining temporaries, otherwise
+ NULL is returned. The only partitions which are associated with actual
+ variables at this point are those which are forced to be coalesced for
+ various reason. (live on entry, live across abnormal edges, etc.). */
+
+static tree_live_info_p
+coalesce_ssa_name (var_map map, int flags)
+{
+ unsigned num, x;
+ sbitmap live;
+ root_var_p rv;
+ tree_live_info_p liveinfo;
+ conflict_graph graph;
+ coalesce_list_p cl = NULL;
+ sbitmap_iterator sbi;
+
+ if (num_var_partitions (map) <= 1)
+ return NULL;
+
+ liveinfo = calculate_live_on_entry (map);
+ calculate_live_on_exit (liveinfo);
+ rv = root_var_init (map);
+
+ /* Remove single element variable from the list. */
+ root_var_compact (rv);
+
+ cl = create_coalesce_list (map);
+
+ coalesce_phi_operands (map, cl);
+ coalesce_result_decls (map, cl);
+ coalesce_asm_operands (map, cl);
/* Build a conflict graph. */
graph = build_tree_conflict_graph (liveinfo, rv, cl);
/* First, coalesce all live on entry variables to their root variable.
This will ensure the first use is coming from the correct location. */
- live = sbitmap_alloc (num_var_partitions (map));
+ num = num_var_partitions (map);
+ live = sbitmap_alloc (num);
sbitmap_zero (live);
/* Set 'live' vector to indicate live on entry partitions. */
- num = num_var_partitions (map);
for (x = 0 ; x < num; x++)
{
- var = partition_to_var (map, x);
+ tree var = partition_to_var (map, x);
if (default_def (SSA_NAME_VAR (var)) == var)
SET_BIT (live, x);
}
partition. */
EXECUTE_IF_SET_IN_SBITMAP (live, 0, x, sbi)
{
- var = root_var (rv, root_var_find (rv, x));
- ann = var_ann (var);
+ tree var = root_var (rv, root_var_find (rv, x));
+ var_ann_t ann = var_ann (var);
/* If these aren't already coalesced... */
if (partition_to_var (map, x) != var)
{