From: Martin Liska Date: Sun, 22 Mar 2015 22:47:06 +0000 (+0100) Subject: IPA ICF: include hash values of references. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3ab933594942029c75a9f966ba949c8a0ead1de8;p=gcc.git IPA ICF: include hash values of references. * ipa-icf.c (sem_item::update_hash_by_addr_refs): New function. (sem_item::update_hash_by_local_refs): Likewise. (sem_variable::get_hash): Empty line is fixed. (sem_item_optimizer::execute): Include adding of hash references. (sem_item_optimizer::update_hash_by_addr_refs): New function. (sem_item_optimizer::build_hash_based_classes): Use local hash. * ipa-icf.h (sem_item::update_hash_by_addr_refs): New function. (sem_item::update_hash_by_local_refs): Likewise. From-SVN: r221576 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 44eaf45415c..36c88ee3499 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,14 @@ +2015-03-22 Martin Liska + + * ipa-icf.c (sem_item::update_hash_by_addr_refs): New function. + (sem_item::update_hash_by_local_refs): Likewise. + (sem_variable::get_hash): Empty line is fixed. + (sem_item_optimizer::execute): Include adding of hash references. + (sem_item_optimizer::update_hash_by_addr_refs): New function. + (sem_item_optimizer::build_hash_based_classes): Use local hash. + * ipa-icf.h (sem_item::update_hash_by_addr_refs): New function. + (sem_item::update_hash_by_local_refs): Likewise. + 2015-03-20 Jan Hubicka PR ipa/65502 diff --git a/gcc/ipa-icf.c b/gcc/ipa-icf.c index 360cf17199c..bdfbd3ba362 100644 --- a/gcc/ipa-icf.c +++ b/gcc/ipa-icf.c @@ -557,6 +557,72 @@ sem_function::equals_wpa (sem_item *item, return true; } +/* Update hash by address sensitive references. We iterate over all + sensitive references (address_matters_p) and we hash ultime alias + target of these nodes, which can improve a semantic item hash. + TODO: stronger SCC based hashing would be desirable here. */ + +void +sem_item::update_hash_by_addr_refs (hash_map &m_symtab_node_map) +{ + if (is_a (node) && DECL_VIRTUAL_P (node->decl)) + return; + + ipa_ref* ref; + inchash::hash hstate (hash); + for (unsigned i = 0; i < node->num_references (); i++) + { + ref = node->iterate_reference (i, ref); + if (ref->address_matters_p () || !m_symtab_node_map.get (ref->referred)) + hstate.add_ptr (ref->referred->ultimate_alias_target ()); + } + + if (is_a (node)) + { + for (cgraph_edge *e = dyn_cast (node)->callers; e; + e = e->next_caller) + { + sem_item **result = m_symtab_node_map.get (e->callee); + if (!result) + hstate.add_ptr (e->callee->ultimate_alias_target ()); + } + } + + hash = hstate.end (); +} + +/* Update hash by computed local hash values taken from different + semantic items. */ + +void +sem_item::update_hash_by_local_refs (hash_map &m_symtab_node_map) +{ + inchash::hash state (hash); + for (unsigned j = 0; j < node->num_references (); j++) + { + ipa_ref *ref; + ref = node->iterate_reference (j, ref); + sem_item **result = m_symtab_node_map.get (ref->referring); + if (result) + state.merge_hash ((*result)->hash); + } + + if (type == FUNC) + { + for (cgraph_edge *e = dyn_cast (node)->callees; e; + e = e->next_callee) + { + sem_item **result = m_symtab_node_map.get (e->caller); + if (result) + state.merge_hash ((*result)->hash); + } + } + + global_hash = state.end (); +} + /* Returns true if the item equals to ITEM given as argument. */ bool @@ -1749,8 +1815,8 @@ hashval_t sem_variable::get_hash (void) { if (hash) - return hash; + /* All WPA streamed in symbols should have their hashes computed at compile time. At this point, the constructor may not be in memory at all. DECL_INITIAL (decl) would be error_mark_node in that case. */ @@ -2216,6 +2282,8 @@ sem_item_optimizer::execute (void) filter_removed_items (); unregister_hooks (); + build_graph (); + update_hash_by_addr_refs (); build_hash_based_classes (); if (dump_file) @@ -2225,8 +2293,6 @@ sem_item_optimizer::execute (void) for (unsigned int i = 0; i < m_items.length(); i++) m_items[i]->init_wpa (); - build_graph (); - subdivide_classes_by_equality (true); if (dump_file) @@ -2315,6 +2381,27 @@ sem_item_optimizer::add_item_to_class (congruence_class *cls, sem_item *item) item->cls = cls; } +/* For each semantic item, append hash values of references. */ + +void +sem_item_optimizer::update_hash_by_addr_refs () +{ + /* First, append to hash sensitive references. */ + for (unsigned i = 0; i < m_items.length (); i++) + m_items[i]->update_hash_by_addr_refs (m_symtab_node_map); + + /* Once all symbols have enhanced hash value, we can append + hash values of symbols that are seen by IPA ICF and are + references by a semantic item. Newly computed values + are saved to global_hash member variable. */ + for (unsigned i = 0; i < m_items.length (); i++) + m_items[i]->update_hash_by_local_refs (m_symtab_node_map); + + /* Global hash value replace current hash values. */ + for (unsigned i = 0; i < m_items.length (); i++) + m_items[i]->hash = m_items[i]->global_hash; +} + /* Congruence classes are built by hash value. */ void @@ -2324,7 +2411,7 @@ sem_item_optimizer::build_hash_based_classes (void) { sem_item *item = m_items[i]; - congruence_class_group *group = get_group_by_hash (item->get_hash (), + congruence_class_group *group = get_group_by_hash (item->hash, item->type); if (!group->classes.length ()) diff --git a/gcc/ipa-icf.h b/gcc/ipa-icf.h index 8245b5445cc..cd21cacc94b 100644 --- a/gcc/ipa-icf.h +++ b/gcc/ipa-icf.h @@ -189,6 +189,15 @@ public: /* Dump symbol to FILE. */ virtual void dump_to_file (FILE *file) = 0; + /* Update hash by address sensitive references. */ + void update_hash_by_addr_refs (hash_map &m_symtab_node_map); + + /* Update hash by computed local hash values taken from different + semantic items. */ + void update_hash_by_local_refs (hash_map &m_symtab_node_map); + /* Return base tree that can be used for compatible_types_p and contains_polymorphic_type_p comparison. */ static bool get_base_types (tree *t1, tree *t2); @@ -226,9 +235,13 @@ public: /* A set with symbol table references. */ hash_set refs_set; + /* Hash of item. */ + hashval_t hash; + + /* Temporary hash used where hash values of references are added. */ + hashval_t global_hash; protected: /* Cached, once calculated hash for the item. */ - hashval_t hash; /* Accumulate to HSTATE a hash of constructor expression EXP. */ static void add_expr (const_tree exp, inchash::hash &hstate); @@ -494,6 +507,9 @@ public: private: + /* For each semantic item, append hash values of references. */ + void update_hash_by_addr_refs (); + /* Congruence classes are built by hash value. */ void build_hash_based_classes (void);