namespace autofdo
{
+/* Intermediate edge info used when propagating AutoFDO profile information.
+ We can't edge->count() directly since it's computed from edge's probability
+ while probability is yet not decided during propagation. */
+#define AFDO_EINFO(e) ((struct edge_info *) e->aux)
+class edge_info
+{
+public:
+ edge_info () : count_ (profile_count::zero ().afdo ()), annotated_ (false) {}
+ bool is_annotated () const { return annotated_; }
+ void set_annotated () { annotated_ = true; }
+ profile_count get_count () const { return count_; }
+ void set_count (profile_count count) { count_ = count; }
+private:
+ profile_count count_;
+ bool annotated_;
+};
+
/* Represent a source location: (function_decl, lineno). */
typedef std::pair<tree, unsigned> decl_lineno;
annotated->insert (bb);
}
-static bool
-is_edge_annotated (const edge e, const edge_set &annotated)
-{
- return annotated.find (e) != annotated.end ();
-}
-
-static void
-set_edge_annotated (edge e, edge_set *annotated)
-{
- annotated->insert (e);
-}
-
/* For a given BB, set its execution count. Attach value profile if a stmt
is not in PROMOTED, because we only want to promote an indirect call once.
Return TRUE if BB is annotated. */
edges' counts are known, then the basic block's unknown count can also be
calculated.
IS_SUCC is true if out edges of a basic blocks are examined.
- Update ANNOTATED_BB and ANNOTATED_EDGE accordingly.
+ Update ANNOTATED_BB accordingly.
Return TRUE if any basic block/edge count is changed. */
static bool
-afdo_propagate_edge (bool is_succ, bb_set *annotated_bb,
- edge_set *annotated_edge)
+afdo_propagate_edge (bool is_succ, bb_set *annotated_bb)
{
basic_block bb;
bool changed = false;
profile_count total_known_count = profile_count::zero ().afdo ();
FOR_EACH_EDGE (e, ei, is_succ ? bb->succs : bb->preds)
- if (!is_edge_annotated (e, *annotated_edge))
- num_unknown_edge++, unknown_edge = e;
- else
- total_known_count += e->count ();
+ {
+ gcc_assert (AFDO_EINFO (e) != NULL);
+ if (! AFDO_EINFO (e)->is_annotated ())
+ num_unknown_edge++, unknown_edge = e;
+ else
+ total_known_count += AFDO_EINFO (e)->get_count ();
+ }
- if (num_unknown_edge == 0)
+ /* Be careful not to annotate block with no successor in special cases. */
+ if (num_unknown_edge == 0 && total_known_count > bb->count)
{
- if (total_known_count > bb->count)
- {
- bb->count = total_known_count;
- changed = true;
- }
- if (!is_bb_annotated (bb, *annotated_bb))
- {
- set_bb_annotated (bb, annotated_bb);
- changed = true;
- }
+ bb->count = total_known_count;
+ if (!is_bb_annotated (bb, *annotated_bb))
+ set_bb_annotated (bb, annotated_bb);
+ changed = true;
}
else if (num_unknown_edge == 1 && is_bb_annotated (bb, *annotated_bb))
{
- unknown_edge->probability
- = total_known_count.probability_in (bb->count);
- set_edge_annotated (unknown_edge, annotated_edge);
- changed = true;
+ if (bb->count > total_known_count)
+ AFDO_EINFO (unknown_edge)->set_count (bb->count - total_known_count);
+ else
+ AFDO_EINFO (unknown_edge)->set_count (profile_count::zero().afdo ());
+ AFDO_EINFO (unknown_edge)->set_annotated ();
+ changed = true;
}
}
return changed;
goto BB3
In this case, we need to propagate through PHI to determine the edge
- count of BB1->BB.t1, BB.t1->BB.t2.
- Update ANNOTATED_EDGE accordingly. */
+ count of BB1->BB.t1, BB.t1->BB.t2. */
static void
-afdo_propagate_circuit (const bb_set &annotated_bb, edge_set *annotated_edge)
+afdo_propagate_circuit (const bb_set &annotated_bb)
{
basic_block bb;
FOR_ALL_BB_FN (bb, cfun)
bool check_value_one = (((integer_onep (cmp_rhs))
^ (gimple_cond_code (cmp_stmt) == EQ_EXPR))
^ ((e->flags & EDGE_TRUE_VALUE) != 0));
- if (!is_edge_annotated (e, *annotated_edge))
+ if (! AFDO_EINFO (e)->is_annotated ())
continue;
for (i = 0; i < gimple_phi_num_args (phi_stmt); i++)
{
continue;
total++;
only_one = ep;
- if (!e->probability.initialized_p ()
- && !is_edge_annotated (ep, *annotated_edge))
- {
- ep->probability = profile_probability::never ().afdo ();
- set_edge_annotated (ep, annotated_edge);
- }
- }
- if (total == 1 && !is_edge_annotated (only_one, *annotated_edge))
- {
- only_one->probability = e->probability;
- set_edge_annotated (only_one, annotated_edge);
- }
+ if (! (AFDO_EINFO (e)->get_count ()).nonzero_p ()
+ && ! AFDO_EINFO (ep)->is_annotated ())
+ {
+ AFDO_EINFO (ep)->set_count (profile_count::zero ().afdo ());
+ AFDO_EINFO (ep)->set_annotated ();
+ }
+ }
+ if (total == 1 && ! AFDO_EINFO (only_one)->is_annotated ())
+ {
+ AFDO_EINFO (only_one)->set_count (AFDO_EINFO (e)->get_count ());
+ AFDO_EINFO (only_one)->set_annotated ();
+ }
}
}
}
graph. We do the propagation iteratively until stablize. */
static void
-afdo_propagate (bb_set *annotated_bb, edge_set *annotated_edge)
+afdo_propagate (bb_set *annotated_bb)
{
basic_block bb;
bool changed = true;
{
changed = false;
- if (afdo_propagate_edge (true, annotated_bb, annotated_edge))
+ if (afdo_propagate_edge (true, annotated_bb))
changed = true;
- if (afdo_propagate_edge (false, annotated_bb, annotated_edge))
+ if (afdo_propagate_edge (false, annotated_bb))
changed = true;
- afdo_propagate_circuit (*annotated_bb, annotated_edge);
+ afdo_propagate_circuit (*annotated_bb);
}
}
probabilities. */
static void
-afdo_calculate_branch_prob (bb_set *annotated_bb, edge_set *annotated_edge)
+afdo_calculate_branch_prob (bb_set *annotated_bb)
{
+ edge e;
+ edge_iterator ei;
basic_block bb;
- bool has_sample = false;
-
- FOR_EACH_BB_FN (bb, cfun)
- {
- if (bb->count > profile_count::zero ())
- {
- has_sample = true;
- break;
- }
- }
-
- if (!has_sample)
- return;
calculate_dominance_info (CDI_POST_DOMINATORS);
calculate_dominance_info (CDI_DOMINATORS);
loop_optimizer_init (0);
+ FOR_ALL_BB_FN (bb, cfun)
+ {
+ gcc_assert (bb->aux == NULL);
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ {
+ gcc_assert (e->aux == NULL);
+ e->aux = new edge_info ();
+ }
+ }
+
afdo_find_equiv_class (annotated_bb);
- afdo_propagate (annotated_bb, annotated_edge);
+ afdo_propagate (annotated_bb);
FOR_EACH_BB_FN (bb, cfun)
{
- edge e;
- edge_iterator ei;
int num_unknown_succ = 0;
profile_count total_count = profile_count::zero ().afdo ();
FOR_EACH_EDGE (e, ei, bb->succs)
{
- if (!is_edge_annotated (e, *annotated_edge))
+ gcc_assert (AFDO_EINFO (e) != NULL);
+ if (! AFDO_EINFO (e)->is_annotated ())
num_unknown_succ++;
else
- total_count += e->count ();
+ total_count += AFDO_EINFO (e)->get_count ();
}
if (num_unknown_succ == 0 && total_count > profile_count::zero ())
{
- FOR_EACH_EDGE (e, ei, bb->succs)
- e->probability = e->count ().probability_in (total_count);
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ e->probability
+ = AFDO_EINFO (e)->get_count ().probability_in (total_count);
}
}
FOR_ALL_BB_FN (bb, cfun)
- bb->aux = NULL;
+ {
+ bb->aux = NULL;
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ if (AFDO_EINFO (e) != NULL)
+ {
+ delete AFDO_EINFO (e);
+ e->aux = NULL;
+ }
+ }
loop_optimizer_finalize ();
free_dominance_info (CDI_DOMINATORS);
{
basic_block bb;
bb_set annotated_bb;
- edge_set annotated_edge;
const function_instance *s
= afdo_source_profile->get_function_instance_by_decl (
current_function_decl);
profile_count max_count = ENTRY_BLOCK_PTR_FOR_FN (cfun)->count;
FOR_EACH_BB_FN (bb, cfun)
- {
- edge e;
- edge_iterator ei;
-
- /* As autoFDO uses sampling approach, we have to assume that all
- counters are zero when not seen by autoFDO. */
- bb->count = profile_count::zero ().afdo ();
- FOR_EACH_EDGE (e, ei, bb->succs)
- e->probability = profile_probability::uninitialized ();
-
- if (afdo_set_bb_count (bb, promoted_stmts))
- set_bb_annotated (bb, &annotated_bb);
- if (bb->count > max_count)
- max_count = bb->count;
- }
+ {
+ /* As autoFDO uses sampling approach, we have to assume that all
+ counters are zero when not seen by autoFDO. */
+ bb->count = profile_count::zero ().afdo ();
+ if (afdo_set_bb_count (bb, promoted_stmts))
+ set_bb_annotated (bb, &annotated_bb);
+ if (bb->count > max_count)
+ max_count = bb->count;
+ }
if (ENTRY_BLOCK_PTR_FOR_FN (cfun)->count
> ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb->count)
{
afdo_source_profile->mark_annotated (cfun->function_end_locus);
if (max_count > profile_count::zero ())
{
- afdo_calculate_branch_prob (&annotated_bb, &annotated_edge);
+ /* Calculate, propagate count and probability information on CFG. */
+ afdo_calculate_branch_prob (&annotated_bb);
update_max_bb_count ();
profile_status_for_fn (cfun) = PROFILE_READ;
}
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