bool self_recursive;
bool uninlinable;
int growth;
+ int cap;
};
|| !opt_for_fn (e->caller->decl, optimize))
{
d->uninlinable = true;
+ if (d->cap < INT_MAX)
+ return true;
continue;
}
if (e->recursive_p ())
{
d->self_recursive = true;
+ if (d->cap < INT_MAX)
+ return true;
continue;
}
d->growth += estimate_edge_growth (e);
+ if (d->growth > d->cap)
+ return true;
}
return false;
}
+/* Return estimated savings for eliminating offline copy of NODE by inlining
+ it everywhere. */
+
+static int
+offline_size (struct cgraph_node *node, ipa_size_summary *info)
+{
+ if (!DECL_EXTERNAL (node->decl))
+ {
+ if (node->will_be_removed_from_program_if_no_direct_calls_p ())
+ return info->size;
+ /* COMDAT functions are very often not shared across multiple units
+ since they come from various template instantiations.
+ Take this into account. */
+ else if (DECL_COMDAT (node->decl)
+ && node->can_remove_if_no_direct_calls_p ())
+ return (info->size
+ * (100 - PARAM_VALUE (PARAM_COMDAT_SHARING_PROBABILITY))
+ + 50) / 100;
+ }
+ return 0;
+}
/* Estimate the growth caused by inlining NODE into all callees. */
int
estimate_growth (struct cgraph_node *node)
{
- struct growth_data d = { node, false, false, 0 };
- class ipa_size_summary *info = ipa_size_summaries->get (node);
+ struct growth_data d = { node, false, false, 0, INT_MAX };
+ ipa_size_summary *info = ipa_size_summaries->get (node);
- node->call_for_symbol_and_aliases (do_estimate_growth_1, &d, true);
+ if (node->call_for_symbol_and_aliases (do_estimate_growth_1, &d, true))
+ return 1;
/* For self recursive functions the growth estimation really should be
infinity. We don't want to return very large values because the growth
return zero or negative growths. */
if (d.self_recursive)
d.growth = d.growth < info->size ? info->size : d.growth;
- else if (DECL_EXTERNAL (node->decl) || d.uninlinable)
- ;
- else
- {
- if (node->will_be_removed_from_program_if_no_direct_calls_p ())
- d.growth -= info->size;
- /* COMDAT functions are very often not shared across multiple units
- since they come from various template instantiations.
- Take this into account. */
- else if (DECL_COMDAT (node->decl)
- && node->can_remove_if_no_direct_calls_p ())
- d.growth -= (info->size
- * (100 - PARAM_VALUE (PARAM_COMDAT_SHARING_PROBABILITY))
- + 50) / 100;
- }
+ else if (!d.uninlinable)
+ d.growth -= offline_size (node, info);
return d.growth;
}
/* Verify if there are fewer than MAX_CALLERS. */
static bool
-check_callers (cgraph_node *node, int *max_callers)
+check_callers (cgraph_node *node, int *growth, int *n, int offline,
+ int min_size, struct cgraph_edge *known_edge)
{
ipa_ref *ref;
for (cgraph_edge *e = node->callers; e; e = e->next_caller)
{
- (*max_callers)--;
- if (!*max_callers
- || cgraph_inline_failed_type (e->inline_failed) == CIF_FINAL_ERROR)
+ edge_growth_cache_entry *entry;
+
+ if (e == known_edge)
+ continue;
+ if (cgraph_inline_failed_type (e->inline_failed) == CIF_FINAL_ERROR)
+ return true;
+ if (edge_growth_cache != NULL
+ && (entry = edge_growth_cache->get (e)) != NULL
+ && entry->size != 0)
+ *growth += entry->size - (entry->size > 0);
+ else
+ {
+ class ipa_call_summary *es = ipa_call_summaries->get (e);
+ if (!es)
+ return true;
+ *growth += min_size - es->call_stmt_size;
+ if (--(*n) < 0)
+ return false;
+ }
+ if (*growth > offline)
return true;
}
- FOR_EACH_ALIAS (node, ref)
- if (check_callers (dyn_cast <cgraph_node *> (ref->referring), max_callers))
- return true;
+ if (*n > 0)
+ FOR_EACH_ALIAS (node, ref)
+ if (check_callers (dyn_cast <cgraph_node *> (ref->referring), growth, n,
+ offline, min_size, known_edge))
+ return true;
return false;
}
-/* Make cheap estimation if growth of NODE is likely positive knowing
- EDGE_GROWTH of one particular edge.
- We assume that most of other edges will have similar growth
- and skip computation if there are too many callers. */
+/* Decide if growth of NODE is positive. This is cheaper than calculating
+ actual growth. If edge growth of KNOWN_EDGE is known
+ it is passed by EDGE_GROWTH. */
bool
-growth_likely_positive (struct cgraph_node *node,
- int edge_growth)
+growth_positive_p (struct cgraph_node *node,
+ struct cgraph_edge * known_edge, int edge_growth)
{
- int max_callers;
struct cgraph_edge *e;
- gcc_checking_assert (edge_growth > 0);
+
+ ipa_size_summary *s = ipa_size_summaries->get (node);
/* First quickly check if NODE is removable at all. */
- if (DECL_EXTERNAL (node->decl))
- return true;
- if (!node->can_remove_if_no_direct_calls_and_refs_p ()
- || node->address_taken)
+ int offline = offline_size (node, s);
+ if (offline <= 0 && known_edge && edge_growth > 0)
return true;
- max_callers = ipa_size_summaries->get (node)->size * 4 / edge_growth + 2;
+ int min_size = ipa_fn_summaries->get (node)->min_size;
+ int n = 10;
+ int min_growth = known_edge ? edge_growth : 0;
for (e = node->callers; e; e = e->next_caller)
{
- max_callers--;
- if (!max_callers
- || cgraph_inline_failed_type (e->inline_failed) == CIF_FINAL_ERROR)
+ edge_growth_cache_entry *entry;
+
+ if (cgraph_inline_failed_type (e->inline_failed) == CIF_FINAL_ERROR)
+ return true;
+ if (e == known_edge)
+ continue;
+ if (edge_growth_cache != NULL
+ && (entry = edge_growth_cache->get (e)) != NULL
+ && entry->size != 0)
+ min_growth += entry->size - (entry->size > 0);
+ else
+ {
+ class ipa_call_summary *es = ipa_call_summaries->get (e);
+ if (!es)
+ return true;
+ min_growth += min_size - es->call_stmt_size;
+ if (--n <= 0)
+ break;
+ }
+ if (min_growth > offline)
return true;
}
ipa_ref *ref;
- FOR_EACH_ALIAS (node, ref)
- if (check_callers (dyn_cast <cgraph_node *> (ref->referring), &max_callers))
- return true;
-
- /* Unlike for functions called once, we play unsafe with
- COMDATs. We can allow that since we know functions
- in consideration are small (and thus risk is small) and
- moreover grow estimates already accounts that COMDAT
- functions may or may not disappear when eliminated from
- current unit. With good probability making aggressive
- choice in all units is going to make overall program
- smaller. */
- if (DECL_COMDAT (node->decl))
- {
- if (!node->can_remove_if_no_direct_calls_p ())
+ if (n > 0)
+ FOR_EACH_ALIAS (node, ref)
+ if (check_callers (dyn_cast <cgraph_node *> (ref->referring),
+ &min_growth, &n, offline, min_size, known_edge))
return true;
- }
- else if (!node->will_be_removed_from_program_if_no_direct_calls_p ())
- return true;
- return estimate_growth (node) > 0;
+ struct growth_data d = { node, false, false, 0, offline };
+ if (node->call_for_symbol_and_aliases (do_estimate_growth_1, &d, true))
+ return true;
+ if (d.self_recursive || d.uninlinable)
+ return true;
+ return (d.growth > offline);
}
&& !opt_for_fn (e->caller->decl, flag_inline_functions)
&& growth >= PARAM_VALUE (PARAM_MAX_INLINE_INSNS_SMALL))
{
- /* growth_likely_positive is expensive, always test it last. */
+ /* growth_positive_p is expensive, always test it last. */
if (growth >= inline_insns_single (e->caller, false)
- || growth_likely_positive (callee, growth))
+ || growth_positive_p (callee, e, growth))
{
e->inline_failed = CIF_NOT_DECLARED_INLINED;
want_inline = false;
|| growth >= inline_insns_auto (e->caller, true)
|| !big_speedup_p (e)))
{
- /* growth_likely_positive is expensive, always test it last. */
+ /* growth_positive_p is expensive, always test it last. */
if (growth >= inline_insns_single (e->caller, false)
- || growth_likely_positive (callee, growth))
+ || growth_positive_p (callee, e, growth))
{
if (opt_for_fn (e->caller->decl, optimize) >= 3)
e->inline_failed = CIF_MAX_INLINE_INSNS_AUTO_LIMIT;
/* If call is cold, do not inline when function body would grow. */
else if (!e->maybe_hot_p ()
&& (growth >= inline_insns_single (e->caller, false)
- || growth_likely_positive (callee, growth)))
+ || growth_positive_p (callee, e, growth)))
{
e->inline_failed = CIF_UNLIKELY_CALL;
want_inline = false;
if (!node->call_for_symbol_and_aliases (has_caller_p, NULL, true))
return false;
/* Inlining into all callers would increase size? */
- if (estimate_growth (node) > 0)
+ if (growth_positive_p (node, NULL, INT_MIN) > 0)
return false;
/* All inlines must be possible. */
if (node->call_for_symbol_and_aliases (check_callers, &has_hot_call,
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