the function created by applying all the inline decisions already
present in the callgraph).
- We also provide accestor to the inline_summary datastructure and
+ We provide accestor to the inline_summary datastructure and
basic logic updating the parameters when inlining is performed.
+ The summaries are context sensitive. Context means
+ 1) partial assignment of known constant values of operands
+ 2) whether function is inlined into the call or not.
+ It is easy to add more variants. To represent function size and time
+ that depends on context (i.e. it is known to be optimized away when
+ context is known either by inlining or from IP-CP and clonning),
+ we use predicates. Predicates are logical formulas in
+ conjunctive-disjunctive form consisting of clauses. Clauses are bitmaps
+ specifying what conditions must be true. Conditions are simple test
+ of the form described above.
+
+ In order to make predicate (possibly) true, all of its clauses must
+ be (possibly) true. To make clause (possibly) true, one of conditions
+ it mentions must be (possibly) true. There are fixed bounds on
+ number of clauses and conditions and all the manipulation functions
+ are conservative in positive direction. I.e. we may lose precision
+ by thinking that predicate may be true even when it is not.
+
+ estimate_edge_size and estimate_edge_growth can be used to query
+ function size/time in the given context. inline_merge_summary merges
+ properties of caller and callee after inlining.
+
Finally pass_inline_parameters is exported. This is used to drive
computation of function parameters used by the early inliner. IPA
inlined performs analysis via its analyze_function method. */
#include "lto-streamer.h"
#include "ipa-inline.h"
-#define MAX_TIME 1000000000
+/* Estimate runtime of function can easilly run into huge numbers with many
+ nested loops. Be sure we can compute time * INLINE_SIZE_SCALE in integer.
+ For anything larger we use gcov_type. */
+#define MAX_TIME 1000000
+
+/* Number of bits in integer, but we really want to be stable across different
+ hosts. */
+#define NUM_CONDITIONS 32
+
+enum predicate_conditions
+{
+ predicate_false_condition = 0,
+ predicate_not_inlined_condition = 1,
+ predicate_first_dynamic_condition = 2
+};
+
+/* Special condition code we use to represent test that operand is compile time
+ constant. */
+#define IS_NOT_CONSTANT ERROR_MARK
/* Holders of ipa cgraph hooks: */
static struct cgraph_node_hook_list *function_insertion_hook_holder;
static struct cgraph_node_hook_list *node_removal_hook_holder;
static struct cgraph_2node_hook_list *node_duplication_hook_holder;
+static struct cgraph_edge_hook_list *edge_removal_hook_holder;
static void inline_node_removal_hook (struct cgraph_node *, void *);
static void inline_node_duplication_hook (struct cgraph_node *,
struct cgraph_node *, void *);
-/* VECtor holding inline summaries. */
-VEC(inline_summary_t,heap) *inline_summary_vec;
+/* VECtor holding inline summaries.
+ In GGC memory because conditions might point to constant trees. */
+VEC(inline_summary_t,gc) *inline_summary_vec;
+
+/* Cached node/edge growths. */
+VEC(int,heap) *node_growth_cache;
+VEC(edge_growth_cache_entry,heap) *edge_growth_cache;
+
+
+/* Return true predicate (tautology).
+ We represent it by empty list of clauses. */
+
+static inline struct predicate
+true_predicate (void)
+{
+ struct predicate p;
+ p.clause[0]=0;
+ return p;
+}
+
+
+/* Return predicate testing single condition number COND. */
+
+static inline struct predicate
+single_cond_predicate (int cond)
+{
+ struct predicate p;
+ p.clause[0]=1 << cond;
+ p.clause[1]=0;
+ return p;
+}
+
+
+/* Return false predicate. First clause require false condition. */
+
+static inline struct predicate
+false_predicate (void)
+{
+ return single_cond_predicate (predicate_false_condition);
+}
+
+
+/* Return predicate that is set true when function is not inlined. */
+static inline struct predicate
+not_inlined_predicate (void)
+{
+ return single_cond_predicate (predicate_not_inlined_condition);
+}
+
+
+/* Add condition to condition list CONDS. */
+
+static struct predicate
+add_condition (struct inline_summary *summary, int operand_num,
+ enum tree_code code, tree val)
+{
+ int i;
+ struct condition *c;
+ struct condition new_cond;
+
+ for (i = 0; VEC_iterate (condition, summary->conds, i, c); i++)
+ {
+ if (c->operand_num == operand_num
+ && c->code == code
+ && c->val == val)
+ return single_cond_predicate (i + predicate_first_dynamic_condition);
+ }
+ /* Too many conditions. Give up and return constant true. */
+ if (i == NUM_CONDITIONS - predicate_first_dynamic_condition)
+ return true_predicate ();
+
+ new_cond.operand_num = operand_num;
+ new_cond.code = code;
+ new_cond.val = val;
+ VEC_safe_push (condition, gc, summary->conds, &new_cond);
+ return single_cond_predicate (i + predicate_first_dynamic_condition);
+}
+
+
+/* Add clause CLAUSE into the predicate. */
+
+static inline void
+add_clause (struct predicate *p, clause_t clause)
+{
+ int i;
+ int insert_here = 0;
+ /* True clause. */
+ if (!clause)
+ return;
+
+ /* Flase clause makes the whole predicate false. Kill the other variants. */
+ if (clause & (1 << predicate_false_condition))
+ {
+ p->clause[0] = (1 << predicate_false_condition);
+ p->clause[1] = 0;
+ }
+ for (i = 0; i < MAX_CLAUSES; i++)
+ {
+ if (p->clause[i] == clause)
+ return;
+ if (!p->clause[i])
+ break;
+ if (p->clause[i] < clause && !insert_here)
+ insert_here = i;
+ }
+ /* We run out of variants. Be conservative in positive direciton. */
+ if (i == MAX_CLAUSES)
+ return;
+ /* Keep clauses ordered by index, so equivalence testing is easy. */
+ p->clause[i + 1] = 0;
+ for (;i > insert_here; i--)
+ p->clause[i] = p->clause[i - 1];
+ p->clause[insert_here] = clause;
+}
+
+
+/* Return P & P2. */
+
+static struct predicate
+and_predicates (struct predicate *p, struct predicate *p2)
+{
+ struct predicate out = *p;
+ int i;
+ for (i = 0; p2->clause[i]; i++)
+ add_clause (&out, p2->clause[i]);
+ return out;
+}
+
+
+/* Return P | P2. */
+
+static struct predicate
+or_predicates (struct predicate *p, struct predicate *p2)
+{
+ struct predicate out = true_predicate ();
+ int i,j;
+ /* If one of conditions is false, return the other. */
+ if (p2->clause[0] == 1 << predicate_false_condition)
+ {
+ gcc_checking_assert (!p2->clause[1]);
+ return *p;
+ }
+ if (p->clause[0] == 1 << predicate_false_condition)
+ {
+ gcc_checking_assert (!p->clause[1]);
+ return *p2;
+ }
+ for (i = 0; p->clause[i]; i++)
+ for (j = 0; p2->clause[j]; j++)
+ add_clause (&out, p->clause[i] | p2->clause[j]);
+ return out;
+}
+
+
+/* Return true if predicates are obviously equal. */
+
+static inline bool
+predicates_equal_p (struct predicate *p, struct predicate *p2)
+{
+ int i;
+ for (i = 0; p->clause[i]; i++)
+ if (p->clause[i] != p2->clause[i])
+ return false;
+ return !p2->clause[i];
+}
+
+
+/* Having partial truth assignment in POSSIBLE_TRUTHS, return false if predicate P
+ to be false. */
+
+static bool
+evaulate_predicate (struct predicate *p, clause_t possible_truths)
+{
+ int i;
+
+ /* True remains true. */
+ if (!p->clause[0])
+ return true;
+
+ /* See if we can find clause we can disprove. */
+ for (i = 0; p->clause[i]; i++)
+ if (!(p->clause[i] & possible_truths))
+ return false;
+ return true;
+}
+
+
+/* Dump conditional COND. */
+
+static void
+dump_condition (FILE *f, conditions conditions, int cond)
+{
+ condition *c;
+ if (cond == predicate_false_condition)
+ fprintf (f, "false");
+ else if (cond == predicate_not_inlined_condition)
+ fprintf (f, "not inlined");
+ else
+ {
+ c = VEC_index (condition, conditions, cond - predicate_first_dynamic_condition);
+ fprintf (f, "op%i", c->operand_num);
+ if (c->code == IS_NOT_CONSTANT)
+ {
+ fprintf (f, " not constant");
+ return;
+ }
+ fprintf (f, " %s ", op_symbol_code (c->code));
+ print_generic_expr (f, c->val, 1);
+ }
+}
+
+
+/* Dump clause CLAUSE. */
+
+static void
+dump_clause (FILE *f, conditions conds, clause_t clause)
+{
+ int i;
+ bool found = false;
+ fprintf (f, "(");
+ if (!clause)
+ fprintf (f, "true");
+ for (i = 0; i < NUM_CONDITIONS; i++)
+ if (clause & (1 << i))
+ {
+ if (found)
+ fprintf (f, " || ");
+ found = true;
+ dump_condition (f, conds, i);
+ }
+ fprintf (f, ")");
+}
+
+
+/* Dump predicate PREDICATE. */
+
+static void
+dump_predicate (FILE *f, conditions conds, struct predicate *pred)
+{
+ int i;
+ if (!pred->clause[0])
+ dump_clause (f, conds, 0);
+ else
+ for (i = 0; pred->clause[i]; i++)
+ {
+ if (i)
+ fprintf (f, " && ");
+ dump_clause (f, conds, pred->clause[i]);
+ }
+ fprintf (f, "\n");
+}
+
+
+/* Record SIZE and TIME under condition PRED into the inline summary. */
+
+static void
+account_size_time (struct inline_summary *summary, int size, int time, struct predicate *pred)
+{
+ size_time_entry *e;
+ bool found = false;
+ int i;
+
+ if (pred->clause[0] == (1 << predicate_false_condition))
+ return;
+
+ /* We need to create initial empty unconitional clause, but otherwie
+ we don't need to account empty times and sizes. */
+ if (!size && !time && summary->conds)
+ return;
+
+ /* Watch overflow that might result from insane profiles. */
+ if (time > MAX_TIME * INLINE_TIME_SCALE)
+ time = MAX_TIME * INLINE_TIME_SCALE;
+ gcc_assert (time >= 0);
+
+ for (i = 0; VEC_iterate (size_time_entry, summary->entry, i, e); i++)
+ if (predicates_equal_p (&e->predicate, pred))
+ {
+ found = true;
+ break;
+ }
+ if (i == 32)
+ {
+ i = 0;
+ found = true;
+ e = VEC_index (size_time_entry, summary->entry, 0);
+ gcc_assert (!e->predicate.clause[0]);
+ }
+ if (dump_file && (dump_flags & TDF_DETAILS) && (time || size))
+ {
+ fprintf (dump_file, "\t\tAccounting size:%3.2f, time:%3.2f on %spredicate:",
+ ((double)size) / INLINE_SIZE_SCALE, ((double)time) / INLINE_TIME_SCALE,
+ found ? "" : "new ");
+ dump_predicate (dump_file, summary->conds, pred);
+ }
+ if (!found)
+ {
+ struct size_time_entry new_entry;
+ new_entry.size = size;
+ new_entry.time = time;
+ new_entry.predicate = *pred;
+ VEC_safe_push (size_time_entry, gc, summary->entry, &new_entry);
+ }
+ else
+ {
+ e->size += size;
+ e->time += time;
+ if (e->time > MAX_TIME * INLINE_TIME_SCALE)
+ e->time = MAX_TIME * INLINE_TIME_SCALE;
+ }
+}
+
+
+/* Work out what conditions might be true at invocation of E. */
+
+static clause_t
+evaulate_conditions_for_edge (struct cgraph_edge *e, bool inline_p)
+{
+ clause_t clause = inline_p ? 0 : 1 << predicate_not_inlined_condition;
+ struct inline_summary *info = inline_summary (e->callee);
+ int i;
+
+ if (ipa_node_params_vector && info->conds
+ /* FIXME: it seems that we forget to get argument count in some cases,
+ probaby for previously indirect edges or so. */
+ && ipa_get_cs_argument_count (IPA_EDGE_REF (e)))
+ {
+ struct ipa_node_params *parms_info;
+ struct ipa_edge_args *args = IPA_EDGE_REF (e);
+ int i, count = ipa_get_cs_argument_count (args);
+ struct ipcp_lattice lat;
+ struct condition *c;
+ VEC (tree, heap) *known_vals = NULL;
+
+ if (e->caller->global.inlined_to)
+ parms_info = IPA_NODE_REF (e->caller->global.inlined_to);
+ else
+ parms_info = IPA_NODE_REF (e->caller);
+
+ VEC_safe_grow_cleared (tree, heap, known_vals, count);
+ for (i = 0; i < count; i++)
+ {
+ ipa_lattice_from_jfunc (parms_info, &lat, ipa_get_ith_jump_func (args, i));
+ if (lat.type == IPA_CONST_VALUE)
+ VEC_replace (tree, known_vals, i, lat.constant);
+ }
+ for (i = 0; VEC_iterate (condition, info->conds, i, c); i++)
+ {
+ tree val = VEC_index (tree, known_vals, c->operand_num);
+ tree res;
+
+ if (!val)
+ {
+ clause |= 1 << (i + predicate_first_dynamic_condition);
+ continue;
+ }
+ if (c->code == IS_NOT_CONSTANT)
+ continue;
+ res = fold_binary_to_constant (c->code, boolean_type_node, val, c->val);
+ if (res
+ && integer_zerop (res))
+ continue;
+ clause |= 1 << (i + predicate_first_dynamic_condition);
+ }
+ VEC_free (tree, heap, known_vals);
+ }
+ else
+ for (i = 0; i < (int)VEC_length (condition, info->conds); i++)
+ clause |= 1 << (i + predicate_first_dynamic_condition);
+
+ return clause;
+}
+
/* Allocate the inline summary vector or resize it to cover all cgraph nodes. */
if (VEC_length (inline_summary_t, inline_summary_vec)
<= (unsigned) cgraph_max_uid)
- VEC_safe_grow_cleared (inline_summary_t, heap,
+ VEC_safe_grow_cleared (inline_summary_t, gc,
inline_summary_vec, cgraph_max_uid + 1);
}
<= (unsigned)node->uid)
return;
info = inline_summary (node);
- info->estimated_growth = INT_MIN;
+ reset_node_growth_cache (node);
+ VEC_free (condition, gc, info->conds);
+ VEC_free (size_time_entry, gc, info->entry);
+ info->conds = NULL;
+ info->entry = NULL;
memset (info, 0, sizeof (inline_summary_t));
}
info = inline_summary (dst);
memcpy (info, inline_summary (src),
sizeof (struct inline_summary));
- info->estimated_growth = INT_MIN;
+ info->conds = VEC_copy (condition, gc, info->conds);
+ info->entry = VEC_copy (size_time_entry, gc, info->entry);
+}
+
+
+/* Keep edge cache consistent across edge removal. */
+
+static void
+inline_edge_removal_hook (struct cgraph_edge *edge, void *data ATTRIBUTE_UNUSED)
+{
+ reset_edge_growth_cache (edge);
+}
+
+
+/* Initialize growth caches. */
+
+void
+initialize_growth_caches (void)
+{
+ if (!edge_removal_hook_holder)
+ edge_removal_hook_holder =
+ cgraph_add_edge_removal_hook (&inline_edge_removal_hook, NULL);
+ if (cgraph_edge_max_uid)
+ VEC_safe_grow_cleared (edge_growth_cache_entry, heap, edge_growth_cache,
+ cgraph_edge_max_uid);
+ if (cgraph_max_uid)
+ VEC_safe_grow_cleared (int, heap, node_growth_cache, cgraph_max_uid);
+}
+
+
+/* Free growth caches. */
+
+void
+free_growth_caches (void)
+{
+ if (edge_removal_hook_holder)
+ cgraph_remove_edge_removal_hook (edge_removal_hook_holder);
+ VEC_free (edge_growth_cache_entry, heap, edge_growth_cache);
+ edge_growth_cache = 0;
+ VEC_free (int, heap, node_growth_cache);
+ node_growth_cache = 0;
}
+
static void
-dump_inline_summary (FILE *f, struct cgraph_node *node)
+dump_inline_summary (FILE * f, struct cgraph_node *node)
{
if (node->analyzed)
{
struct inline_summary *s = inline_summary (node);
+ size_time_entry *e;
+ int i;
fprintf (f, "Inline summary for %s/%i", cgraph_node_name (node),
node->uid);
if (DECL_DISREGARD_INLINE_LIMITS (node->decl))
fprintf (f, " inlinable");
if (s->versionable)
fprintf (f, " versionable");
- fprintf (f, "\n self time: %i, benefit: %i\n",
- s->self_time, s->time_inlining_benefit);
+ fprintf (f, "\n self time: %i\n",
+ s->self_time);
fprintf (f, " global time: %i\n", s->time);
- fprintf (f, " self size: %i, benefit: %i\n",
- s->self_size, s->size_inlining_benefit);
+ fprintf (f, " self size: %i\n",
+ s->self_size);
fprintf (f, " global size: %i\n", s->size);
fprintf (f, " self stack: %i\n",
- (int)s->estimated_self_stack_size);
- fprintf (f, " global stack: %i\n\n",
- (int)s->estimated_stack_size);
+ (int) s->estimated_self_stack_size);
+ fprintf (f, " global stack: %i\n",
+ (int) s->estimated_stack_size);
+ for (i = 0;
+ VEC_iterate (size_time_entry, s->entry, i, e);
+ i++)
+ {
+ fprintf (f, " size:%f, time:%f, predicate:",
+ (double) e->size / INLINE_SIZE_SCALE,
+ (double) e->time / INLINE_TIME_SCALE);
+ dump_predicate (f, s->conds, &e->predicate);
+ }
+ fprintf (f, "\n");
}
}
}
-/* Compute function body size parameters for NODE. */
+/* Return predicate that must be true when is E executable. */
+
+static struct predicate
+edge_execution_predicate (struct ipa_node_params *info,
+ struct inline_summary *summary,
+ edge e)
+{
+ struct predicate p = true_predicate ();
+ gimple last;
+ tree op;
+ int index;
+ enum tree_code code;
+
+ if (e->src == ENTRY_BLOCK_PTR)
+ return p;
+
+ last = last_stmt (e->src);
+ /* TODO: handle switch. */
+ if (!last
+ || gimple_code (last) != GIMPLE_COND)
+ return p;
+ if (!is_gimple_ip_invariant (gimple_cond_rhs (last)))
+ return p;
+ op = gimple_cond_lhs (last);
+ /* TODO: handle conditionals like
+ var = op0 < 4;
+ if (var != 0)
+ and __bulitin_constant_p. */
+ if (TREE_CODE (op) != SSA_NAME
+ || !SSA_NAME_IS_DEFAULT_DEF (op))
+ return p;
+ index = ipa_get_param_decl_index (info, SSA_NAME_VAR (op));
+ if (index == -1)
+ return p;
+ code = gimple_cond_code (last);
+
+ if (EDGE_TRUE_VALUE)
+ code = invert_tree_comparison (code,
+ HONOR_NANS (TYPE_MODE (TREE_TYPE (op))));
+
+ return add_condition (summary,
+ index,
+ gimple_cond_code (last),
+ gimple_cond_rhs (last));
+}
+
+static struct predicate
+will_be_nonconstant_predicate (struct ipa_node_params *info,
+ struct inline_summary *summary,
+ gimple stmt)
+{
+ struct predicate p = true_predicate ();
+ ssa_op_iter iter;
+ tree use;
+ struct predicate op_non_const;
+
+ /* What statments might be optimized away
+ when their arguments are constant
+ TODO: also trivial builtins, especially builtin_constant_p. */
+ if (gimple_code (stmt) != GIMPLE_ASSIGN
+ && gimple_code (stmt) != GIMPLE_COND
+ && gimple_code (stmt) != GIMPLE_SWITCH)
+ return p;
+
+ /* Stores and loads will stay anyway. */
+ if (gimple_vuse (stmt))
+ return p;
+
+ /* See if we understand all operands before we start
+ adding conditionals. */
+ FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE)
+ {
+ /* TODO: handle nested expressions and constant
+ array accesses. */
+ if (TREE_CODE (use) != SSA_NAME
+ || !SSA_NAME_IS_DEFAULT_DEF (use)
+ || ipa_get_param_decl_index (info, SSA_NAME_VAR (use)) < 0)
+ return p;
+ }
+ op_non_const = false_predicate ();
+ FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE)
+ {
+ p = add_condition (summary,
+ ipa_get_param_decl_index (info, SSA_NAME_VAR (use)),
+ IS_NOT_CONSTANT, NULL);
+ op_non_const = or_predicates (&p, &op_non_const);
+ }
+ return op_non_const;
+}
+
+
+/* Compute function body size parameters for NODE.
+ When EARLY is true, we compute only simple summaries without
+ non-trivial predicates to drive the early inliner. */
static void
-estimate_function_body_sizes (struct cgraph_node *node)
+estimate_function_body_sizes (struct cgraph_node *node, bool early)
{
gcov_type time = 0;
- gcov_type time_inlining_benefit = 0;
/* Estimate static overhead for function prologue/epilogue and alignment. */
int size = 2;
/* Benefits are scaled by probability of elimination that is in range
<0,2>. */
- int size_inlining_benefit = 2 * 2;
basic_block bb;
gimple_stmt_iterator bsi;
struct function *my_function = DECL_STRUCT_FUNCTION (node->decl);
int freq;
+ struct inline_summary *info = inline_summary (node);
+ struct predicate bb_predicate;
+ struct ipa_node_params *parms_info;
+
+ parms_info = ipa_node_params_vector && !early ? IPA_NODE_REF (node) : NULL;
+
+ info->conds = 0;
+ info->entry = 0;
+
if (dump_file)
- fprintf (dump_file, "Analyzing function body size: %s\n",
+ fprintf (dump_file, "\nAnalyzing function body size: %s\n",
cgraph_node_name (node));
+ /* When we run into maximal number of entries, we assign everything to the
+ constant truth case. Be sure to have it in list. */
+ bb_predicate = true_predicate ();
+ account_size_time (info, 0, 0, &bb_predicate);
+
+ bb_predicate = not_inlined_predicate ();
+ account_size_time (info, 2 * INLINE_SIZE_SCALE, 0, &bb_predicate);
+
+
gcc_assert (my_function && my_function->cfg);
FOR_EACH_BB_FN (bb, my_function)
{
+ edge e;
+ edge_iterator ei;
+
freq = compute_call_stmt_bb_frequency (node->decl, bb);
+
+ /* TODO: Obviously predicates can be propagated down across CFG. */
+ if (parms_info)
+ {
+ bb_predicate = false_predicate ();
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ {
+ struct predicate ep;
+ ep = edge_execution_predicate (parms_info, info, e);
+ bb_predicate = or_predicates (&ep, &bb_predicate);
+ }
+ }
+ else
+ bb_predicate = true_predicate ();
+
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ fprintf (dump_file, "\n BB %i predicate:", bb->index);
+ dump_predicate (dump_file, info->conds, &bb_predicate);
+ }
+
for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
{
gimple stmt = gsi_stmt (bsi);
if (dump_file && (dump_flags & TDF_DETAILS))
{
- fprintf (dump_file, " freq:%6i size:%3i time:%3i ",
- freq, this_size, this_time);
+ fprintf (dump_file, " ");
print_gimple_stmt (dump_file, stmt, 0, 0);
+ fprintf (dump_file, "\t\tfreq:%3.2f size:%3i time:%3i\n",
+ ((double)freq)/CGRAPH_FREQ_BASE, this_size, this_time);
}
if (is_gimple_call (stmt))
edge->call_stmt_size = this_size;
edge->call_stmt_time = this_time;
- /* Do not inline calls where we cannot triviall work around mismatches
- in argument or return types. */
+ /* Do not inline calls where we cannot triviall work around
+ mismatches in argument or return types. */
if (edge->callee
&& !gimple_check_call_matching_types (stmt, edge->callee->decl))
{
gcc_assert (!gimple_call_cannot_inline_p (stmt));
}
- this_time *= freq;
- time += this_time;
- size += this_size;
+ if (this_time || this_size)
+ {
+ struct predicate will_be_nonconstant;
+ struct predicate p;
+
+ this_time *= freq;
+ time += this_time;
+ size += this_size;
- prob = eliminated_by_inlining_prob (stmt);
- if (prob == 1 && dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, " 50%% will be eliminated by inlining\n");
- if (prob == 2 && dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, " will eliminated by inlining\n");
+ prob = eliminated_by_inlining_prob (stmt);
+ if (prob == 1 && dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\t\t50%% will be eliminated by inlining\n");
+ if (prob == 2 && dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\t\twill eliminated by inlining\n");
+
+ if (parms_info)
+ {
+ will_be_nonconstant
+ = will_be_nonconstant_predicate (parms_info, info, stmt);
+ p = and_predicates (&bb_predicate, &will_be_nonconstant);
+ }
+ else
+ p = true_predicate ();
- size_inlining_benefit += this_size * prob;
- time_inlining_benefit += this_time * prob;
+ /* We account everything but the calls. Calls have their own
+ size/time info attached to cgraph edges. This is neccesary
+ in order to make the cost disappear after inlining. */
+ if (!is_gimple_call (stmt))
+ {
+ if (prob)
+ {
+ struct predicate ip = not_inlined_predicate ();
+ ip = and_predicates (&ip, &p);
+ account_size_time (info, this_size * prob,
+ this_time * prob, &ip);
+ }
+ if (prob != 2)
+ account_size_time (info, this_size * (2 - prob),
+ this_time * (2 - prob), &p);
+ }
- gcc_assert (time >= 0);
- gcc_assert (size >= 0);
+ gcc_assert (time >= 0);
+ gcc_assert (size >= 0);
+ }
}
}
time = (time + CGRAPH_FREQ_BASE / 2) / CGRAPH_FREQ_BASE;
- time_inlining_benefit = ((time_inlining_benefit + CGRAPH_FREQ_BASE)
- / (CGRAPH_FREQ_BASE * 2));
- size_inlining_benefit = (size_inlining_benefit + 1) / 2;
- if (time_inlining_benefit > MAX_TIME)
- time_inlining_benefit = MAX_TIME;
if (time > MAX_TIME)
time = MAX_TIME;
- if (dump_file)
- fprintf (dump_file, "Overall function body time: %i-%i size: %i-%i\n",
- (int)time, (int)time_inlining_benefit,
- size, size_inlining_benefit);
inline_summary (node)->self_time = time;
inline_summary (node)->self_size = size;
- inline_summary (node)->time_inlining_benefit = time_inlining_benefit;
- inline_summary (node)->size_inlining_benefit = size_inlining_benefit;
+ if (dump_file)
+ {
+ fprintf (dump_file, "\n");
+ dump_inline_summary (dump_file, node);
+ }
}
-/* Compute parameters of functions used by inliner. */
+/* Compute parameters of functions used by inliner.
+ EARLY is true when we compute parameters for the early inliner */
void
-compute_inline_parameters (struct cgraph_node *node)
+compute_inline_parameters (struct cgraph_node *node, bool early)
{
HOST_WIDE_INT self_stack_size;
struct cgraph_edge *e;
break;
node->local.can_change_signature = !e;
}
- estimate_function_body_sizes (node);
+ estimate_function_body_sizes (node, early);
/* Inlining characteristics are maintained by the cgraph_mark_inline. */
info->time = info->self_time;
info->size = info->self_size;
- info->estimated_growth = INT_MIN;
info->stack_frame_offset = 0;
info->estimated_stack_size = info->estimated_self_stack_size;
}
static unsigned int
compute_inline_parameters_for_current (void)
{
- compute_inline_parameters (cgraph_get_node (current_function_decl));
+ compute_inline_parameters (cgraph_get_node (current_function_decl), true);
return 0;
}
};
-/* Estimate the time cost for the caller when inlining EDGE. */
+/* Increase SIZE and TIME for size and time needed to handle edge E. */
+
+static void
+estimate_edge_size_and_time (struct cgraph_edge *e, int *size, int *time)
+{
+ *size += e->call_stmt_size * INLINE_SIZE_SCALE;
+ *time += (e->call_stmt_time
+ * e->frequency * (INLINE_TIME_SCALE / CGRAPH_FREQ_BASE));
+ if (*time > MAX_TIME * INLINE_TIME_SCALE)
+ *time = MAX_TIME * INLINE_TIME_SCALE;
+}
+
+
+/* Increase SIZE and TIME for size and time needed to handle all calls in NODE. */
+
+static void
+estimate_calls_size_and_time (struct cgraph_node *node, int *size, int *time)
+{
+ struct cgraph_edge *e;
+ for (e = node->callees; e; e = e->next_callee)
+ if (e->inline_failed)
+ estimate_edge_size_and_time (e, size, time);
+ else
+ estimate_calls_size_and_time (e->callee, size, time);
+ /* TODO: look for devirtualizing oppurtunities. */
+ for (e = node->indirect_calls; e; e = e->next_callee)
+ estimate_edge_size_and_time (e, size, time);
+}
+
+
+/* Estimate size and time needed to execute callee of EDGE assuming
+ that parameters known to be constant at caller of EDGE are
+ propagated. If INLINE_P is true, it is assumed that call will
+ be inlined. */
-static inline int
-estimate_edge_time (struct cgraph_edge *edge)
+static void
+estimate_callee_size_and_time (struct cgraph_edge *edge, bool inline_p,
+ int *ret_size, int *ret_time)
{
- int call_stmt_time;
struct inline_summary *info = inline_summary (edge->callee);
+ clause_t clause = evaulate_conditions_for_edge (edge, inline_p);
+ size_time_entry *e;
+ int size = 0, time = 0;
+ int i;
+
+ if (dump_file
+ && (dump_flags & TDF_DETAILS))
+ {
+ bool found = false;
+ fprintf (dump_file, " Estimating callee body: %s/%i\n"
+ " Known to be false: ",
+ cgraph_node_name (edge->callee),
+ edge->callee->uid);
+
+ for (i = predicate_not_inlined_condition;
+ i < (predicate_first_dynamic_condition
+ + (int)VEC_length (condition, info->conds)); i++)
+ if (!(clause & (1 << i)))
+ {
+ if (found)
+ fprintf (dump_file, ", ");
+ found = true;
+ dump_condition (dump_file, info->conds, i);
+ }
+ }
+
+ for (i = 0; VEC_iterate (size_time_entry, info->entry, i, e); i++)
+ if (evaulate_predicate (&e->predicate, clause))
+ time += e->time, size += e->size;
- call_stmt_time = edge->call_stmt_time;
- gcc_checking_assert (call_stmt_time);
- return (((gcov_type)info->time
- - info->time_inlining_benefit
- - call_stmt_time) * edge->frequency
- + CGRAPH_FREQ_BASE / 2) / CGRAPH_FREQ_BASE;
+ if (time > MAX_TIME * INLINE_TIME_SCALE)
+ time = MAX_TIME * INLINE_TIME_SCALE;
+
+ estimate_calls_size_and_time (edge->callee, &size, &time);
+ time = (time + INLINE_TIME_SCALE / 2) / INLINE_TIME_SCALE;
+ size = (size + INLINE_SIZE_SCALE / 2) / INLINE_SIZE_SCALE;
+
+
+ if (dump_file
+ && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\n size:%i time:%i\n", size, time);
+ if (ret_time)
+ *ret_time = time;
+ if (ret_size)
+ *ret_size = size;
+ return;
+}
+
+
+/* Translate all conditions from callee representation into caller representaiton and
+ symbolically evaulate predicate P into new predicate. */
+
+static struct predicate
+remap_predicate (struct inline_summary *info, struct inline_summary *callee_info,
+ struct predicate *p,
+ VEC (int, heap) *operand_map,
+ clause_t possible_truths)
+{
+ int i;
+ struct predicate out = true_predicate ();
+
+ /* True predicate is easy. */
+ if (p->clause[0] == 0)
+ return *p;
+ for (i = 0; p->clause[i]; i++)
+ {
+ clause_t clause = p->clause[i];
+ int cond;
+ struct predicate clause_predicate = false_predicate ();
+
+ for (cond = 0; cond < NUM_CONDITIONS; cond ++)
+ /* Do we have condition we can't disprove? */
+ if (clause & possible_truths & (1 << cond))
+ {
+ struct predicate cond_predicate;
+ /* Work out if the condition can translate to predicate in the
+ inlined function. */
+ if (cond >= predicate_first_dynamic_condition)
+ {
+ struct condition *c;
+
+ c = VEC_index (condition, callee_info->conds,
+ cond - predicate_first_dynamic_condition);
+ /* See if we can remap condition operand to caller's operand.
+ Otherwise give up. */
+ if (!operand_map
+ || VEC_index (int, operand_map, c->operand_num) == -1)
+ cond_predicate = true_predicate ();
+ else
+ cond_predicate = add_condition (info,
+ VEC_index (int, operand_map,
+ c->operand_num),
+ c->code, c->val);
+ }
+ /* Fixed conditions remains same, construct single
+ condition predicate. */
+ else
+ {
+ cond_predicate.clause[0] = 1 << cond;
+ cond_predicate.clause[1] = 0;
+ }
+ clause_predicate = or_predicates (&clause_predicate, &cond_predicate);
+ }
+ out = and_predicates (&out, &clause_predicate);
+ }
+ return out;
+}
+
+
+/* We inlined EDGE. Update summary of the function we inlined into. */
+
+void
+inline_merge_summary (struct cgraph_edge *edge)
+{
+ struct inline_summary *callee_info = inline_summary (edge->callee);
+ struct cgraph_node *to = (edge->caller->global.inlined_to
+ ? edge->caller->global.inlined_to : edge->caller);
+ struct inline_summary *info = inline_summary (to);
+ clause_t clause = 0; /* not_inline is known to be false. */
+ size_time_entry *e;
+ VEC (int, heap) *operand_map = NULL;
+ int i;
+
+ if (ipa_node_params_vector && callee_info->conds
+ /* FIXME: it seems that we forget to get argument count in some cases,
+ probaby for previously indirect edges or so.
+ Removing the test leads to ICE on tramp3d. */
+ && ipa_get_cs_argument_count (IPA_EDGE_REF (edge)))
+ {
+ struct ipa_edge_args *args = IPA_EDGE_REF (edge);
+ int count = ipa_get_cs_argument_count (args);
+ int i;
+
+ clause = evaulate_conditions_for_edge (edge, true);
+ VEC_safe_grow_cleared (int, heap, operand_map, count);
+ for (i = 0; i < count; i++)
+ {
+ struct ipa_jump_func *jfunc = ipa_get_ith_jump_func (args, i);
+ int map = -1;
+ /* TODO: handle non-NOPs when merging. */
+ if (jfunc->type == IPA_JF_PASS_THROUGH
+ && jfunc->value.pass_through.operation == NOP_EXPR)
+ map = jfunc->value.pass_through.formal_id;
+ VEC_replace (int, operand_map, i, map);
+ }
+ }
+ for (i = 0; VEC_iterate (size_time_entry, callee_info->entry, i, e); i++)
+ {
+ struct predicate p = remap_predicate (info, callee_info,
+ &e->predicate, operand_map, clause);
+ gcov_type add_time = ((gcov_type)e->time * edge->frequency
+ + CGRAPH_FREQ_BASE / 2) / CGRAPH_FREQ_BASE;
+ if (add_time > MAX_TIME)
+ add_time = MAX_TIME;
+ account_size_time (info, e->size, add_time, &p);
+ }
+ info->size = 0;
+ info->time = 0;
+ for (i = 0; VEC_iterate (size_time_entry, info->entry, i, e); i++)
+ info->size += e->size, info->time += e->time;
+ estimate_calls_size_and_time (to, &info->size, &info->time);
+ info->time = (info->time + INLINE_TIME_SCALE / 2) / INLINE_TIME_SCALE;
+ info->size = (info->size + INLINE_SIZE_SCALE / 2) / INLINE_SIZE_SCALE;
+}
+
+
+/* Estimate the time cost for the caller when inlining EDGE.
+ Only to be called via estimate_edge_time, that handles the
+ caching mechanism.
+
+ When caching, also update the cache entry. Compute both time and
+ size, since we always need both metrics eventually. */
+
+int
+do_estimate_edge_time (struct cgraph_edge *edge)
+{
+ int time;
+ int size;
+ gcov_type ret;
+
+ gcc_checking_assert (edge->inline_failed);
+ estimate_callee_size_and_time (edge, true, &size, &time);
+
+ ret = (((gcov_type)time - edge->call_stmt_time) * edge->frequency
+ + CGRAPH_FREQ_BASE / 2) / CGRAPH_FREQ_BASE;
+ if (ret > MAX_TIME)
+ ret = MAX_TIME;
+
+ /* When caching, update the cache entry. */
+ if (edge_growth_cache)
+ {
+ int ret_size;
+ if ((int)VEC_length (edge_growth_cache_entry, edge_growth_cache)
+ <= edge->uid)
+ VEC_safe_grow_cleared (edge_growth_cache_entry, heap, edge_growth_cache,
+ cgraph_edge_max_uid);
+ VEC_index (edge_growth_cache_entry, edge_growth_cache, edge->uid)->time
+ = ret + (ret >= 0);
+
+ ret_size = size - edge->call_stmt_size;
+ gcc_checking_assert (edge->call_stmt_size);
+ VEC_index (edge_growth_cache_entry, edge_growth_cache, edge->uid)->size
+ = ret_size + (ret_size >= 0);
+ }
+ return ret;
+}
+
+
+/* Estimate the growth of the caller when inlining EDGE.
+ Only to be called via estimate_edge_size. */
+
+int
+do_estimate_edge_growth (struct cgraph_edge *edge)
+{
+ int size;
+
+ /* When we do caching, use do_estimate_edge_time to populate the entry. */
+
+ if (edge_growth_cache)
+ {
+ do_estimate_edge_time (edge);
+ size = VEC_index (edge_growth_cache_entry,
+ edge_growth_cache,
+ edge->uid)->size;
+ gcc_checking_assert (size);
+ return size - (size > 0);
+ }
+
+ /* Early inliner runs without caching, go ahead and do the dirty work. */
+ gcc_checking_assert (edge->inline_failed);
+ estimate_callee_size_and_time (edge, true, &size, NULL);
+ gcc_checking_assert (edge->call_stmt_size);
+ return size - edge->call_stmt_size;
}
/* Estimate the growth caused by inlining NODE into all callees. */
int
-estimate_growth (struct cgraph_node *node)
+do_estimate_growth (struct cgraph_node *node)
{
int growth = 0;
struct cgraph_edge *e;
bool self_recursive = false;
struct inline_summary *info = inline_summary (node);
- if (info->estimated_growth != INT_MIN)
- return info->estimated_growth;
-
for (e = node->callers; e; e = e->next_caller)
{
gcc_checking_assert (e->inline_failed);
* (100 - PARAM_VALUE (PARAM_COMDAT_SHARING_PROBABILITY)) + 50) / 100;
}
- info->estimated_growth = growth;
+ if (node_growth_cache)
+ {
+ if ((int)VEC_length (int, node_growth_cache) <= node->uid)
+ VEC_safe_grow_cleared (int, heap, node_growth_cache, cgraph_max_uid);
+ VEC_replace (int, node_growth_cache, node->uid, growth + (growth >= 0));
+ }
return growth;
}
push_cfun (DECL_STRUCT_FUNCTION (node->decl));
current_function_decl = node->decl;
- compute_inline_parameters (node);
+ if (dump_file)
+ fprintf (dump_file, "\nAnalyzing function: %s/%u\n",
+ cgraph_node_name (node), node->uid);
/* FIXME: We should remove the optimize check after we ensure we never run
IPA passes when not optimizing. */
if (flag_indirect_inlining && optimize)
inline_indirect_intraprocedural_analysis (node);
+ compute_inline_parameters (node, false);
current_function_decl = NULL;
pop_cfun ();
}
+/* Stream in inline summaries from the section. */
+
+static void
+inline_read_section (struct lto_file_decl_data *file_data, const char *data,
+ size_t len)
+{
+ const struct lto_function_header *header =
+ (const struct lto_function_header *) data;
+ const int32_t cfg_offset = sizeof (struct lto_function_header);
+ const int32_t main_offset = cfg_offset + header->cfg_size;
+ const int32_t string_offset = main_offset + header->main_size;
+ struct data_in *data_in;
+ struct lto_input_block ib;
+ unsigned int i, count2, j;
+ unsigned int f_count;
+
+ LTO_INIT_INPUT_BLOCK (ib, (const char *) data + main_offset, 0,
+ header->main_size);
+
+ data_in =
+ lto_data_in_create (file_data, (const char *) data + string_offset,
+ header->string_size, NULL);
+ f_count = lto_input_uleb128 (&ib);
+ for (i = 0; i < f_count; i++)
+ {
+ unsigned int index;
+ struct cgraph_node *node;
+ struct inline_summary *info;
+ lto_cgraph_encoder_t encoder;
+ struct bitpack_d bp;
+
+ index = lto_input_uleb128 (&ib);
+ encoder = file_data->cgraph_node_encoder;
+ node = lto_cgraph_encoder_deref (encoder, index);
+ info = inline_summary (node);
+
+ info->estimated_stack_size
+ = info->estimated_self_stack_size = lto_input_uleb128 (&ib);
+ info->size = info->self_size = lto_input_uleb128 (&ib);
+ info->time = info->self_time = lto_input_uleb128 (&ib);
+
+ bp = lto_input_bitpack (&ib);
+ info->inlinable = bp_unpack_value (&bp, 1);
+ info->versionable = bp_unpack_value (&bp, 1);
+
+ count2 = lto_input_uleb128 (&ib);
+ gcc_assert (!info->conds);
+ for (j = 0; j < count2; j++)
+ {
+ struct condition c;
+ c.operand_num = lto_input_uleb128 (&ib);
+ c.code = (enum tree_code) lto_input_uleb128 (&ib);
+ c.val = lto_input_tree (&ib, data_in);
+ VEC_safe_push (condition, gc, info->conds, &c);
+ }
+ count2 = lto_input_uleb128 (&ib);
+ gcc_assert (!info->entry);
+ for (j = 0; j < count2; j++)
+ {
+ struct size_time_entry e;
+ clause_t clause;
+ int k = 0;
+
+ e.size = lto_input_uleb128 (&ib);
+ e.time = lto_input_uleb128 (&ib);
+ do
+ {
+ clause = e.predicate.clause[k++] = lto_input_uleb128 (&ib);
+ }
+ while (clause);
+
+ VEC_safe_push (size_time_entry, gc, info->entry, &e);
+ }
+ }
+
+ lto_free_section_data (file_data, LTO_section_inline_summary, NULL, data,
+ len);
+ lto_data_in_delete (data_in);
+}
+
+
/* Read inline summary. Jump functions are shared among ipa-cp
and inliner, so when ipa-cp is active, we don't need to write them
twice. */
{
size_t len;
const char *data = lto_get_section_data (file_data, LTO_section_inline_summary, NULL, &len);
-
- struct lto_input_block *ib
- = lto_create_simple_input_block (file_data,
- LTO_section_inline_summary,
- &data, &len);
- if (ib)
- {
- unsigned int i;
- unsigned int f_count = lto_input_uleb128 (ib);
-
- for (i = 0; i < f_count; i++)
- {
- unsigned int index;
- struct cgraph_node *node;
- struct inline_summary *info;
- lto_cgraph_encoder_t encoder;
- struct bitpack_d bp;
-
- index = lto_input_uleb128 (ib);
- encoder = file_data->cgraph_node_encoder;
- node = lto_cgraph_encoder_deref (encoder, index);
- info = inline_summary (node);
-
- info->estimated_stack_size
- = info->estimated_self_stack_size = lto_input_uleb128 (ib);
- info->size = info->self_size = lto_input_uleb128 (ib);
- info->size_inlining_benefit = lto_input_uleb128 (ib);
- info->time = info->self_time = lto_input_uleb128 (ib);
- info->time_inlining_benefit = lto_input_uleb128 (ib);
- info->estimated_growth = INT_MIN;
-
- bp = lto_input_bitpack (ib);
- info->inlinable = bp_unpack_value (&bp, 1);
- info->versionable = bp_unpack_value (&bp, 1);
- }
-
- lto_destroy_simple_input_block (file_data,
- LTO_section_inline_summary,
- ib, data, len);
- }
+ if (data)
+ inline_read_section (file_data, data, len);
else
/* Fatal error here. We do not want to support compiling ltrans units with
different version of compiler or different flags than the WPA unit, so
varpool_node_set vset ATTRIBUTE_UNUSED)
{
struct cgraph_node *node;
- struct lto_simple_output_block *ob
- = lto_create_simple_output_block (LTO_section_inline_summary);
+ struct output_block *ob = create_output_block (LTO_section_inline_summary);
lto_cgraph_encoder_t encoder = ob->decl_state->cgraph_node_encoder;
unsigned int count = 0;
int i;
{
struct inline_summary *info = inline_summary (node);
struct bitpack_d bp;
+ int i;
+ size_time_entry *e;
+ struct condition *c;
+
lto_output_uleb128_stream (ob->main_stream,
lto_cgraph_encoder_encode (encoder, node));
lto_output_sleb128_stream (ob->main_stream,
info->self_size);
lto_output_sleb128_stream (ob->main_stream,
- info->size_inlining_benefit);
- lto_output_sleb128_stream (ob->main_stream,
info->self_time);
- lto_output_sleb128_stream (ob->main_stream,
- info->time_inlining_benefit);
bp = bitpack_create (ob->main_stream);
bp_pack_value (&bp, info->inlinable, 1);
bp_pack_value (&bp, info->versionable, 1);
lto_output_bitpack (&bp);
+ lto_output_uleb128_stream (ob->main_stream,
+ VEC_length (condition, info->conds));
+ for (i = 0; VEC_iterate (condition, info->conds, i, c); i++)
+ {
+ lto_output_uleb128_stream (ob->main_stream,
+ c->operand_num);
+ lto_output_uleb128_stream (ob->main_stream,
+ c->code);
+ lto_output_tree (ob, c->val, true);
+ }
+ lto_output_uleb128_stream (ob->main_stream,
+ VEC_length (size_time_entry, info->entry));
+ for (i = 0;
+ VEC_iterate (size_time_entry, info->entry, i, e);
+ i++)
+ {
+ int j;
+ lto_output_uleb128_stream (ob->main_stream,
+ e->time);
+ lto_output_uleb128_stream (ob->main_stream,
+ e->size);
+ for (j = 0; e->predicate.clause[j]; j++)
+ lto_output_uleb128_stream (ob->main_stream,
+ e->predicate.clause[j]);
+ lto_output_uleb128_stream (ob->main_stream, 0);
+ }
}
}
- lto_destroy_simple_output_block (ob);
+ lto_output_1_stream (ob->main_stream, 0);
+ produce_asm (ob, NULL);
+ destroy_output_block (ob);
if (flag_indirect_inlining && !flag_ipa_cp)
ipa_prop_write_jump_functions (set);
if (node_duplication_hook_holder)
cgraph_remove_node_duplication_hook (node_duplication_hook_holder);
node_duplication_hook_holder = NULL;
- VEC_free (inline_summary_t, heap, inline_summary_vec);
+ VEC_free (inline_summary_t, gc, inline_summary_vec);
+ inline_summary_vec = NULL;
}
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