return vn_nary_build_or_lookup_1 (&op, false);
}
+/* Elimination engine. */
+
+class eliminate_dom_walker : public dom_walker
+{
+public:
+ eliminate_dom_walker (cdi_direction, bitmap);
+ ~eliminate_dom_walker ();
+
+ virtual edge before_dom_children (basic_block);
+ virtual void after_dom_children (basic_block);
+
+ virtual tree eliminate_avail (basic_block, tree op);
+ virtual void eliminate_push_avail (basic_block, tree op);
+ tree eliminate_insert (basic_block, gimple_stmt_iterator *gsi, tree val);
+
+ void eliminate_stmt (basic_block, gimple_stmt_iterator *);
+
+ unsigned eliminate_cleanup (bool region_p = false);
+
+ bool do_pre;
+ unsigned int el_todo;
+ unsigned int eliminations;
+ unsigned int insertions;
+
+ /* SSA names that had their defs inserted by PRE if do_pre. */
+ bitmap inserted_exprs;
+
+ /* Blocks with statements that have had their EH properties changed. */
+ bitmap need_eh_cleanup;
+
+ /* Blocks with statements that have had their AB properties changed. */
+ bitmap need_ab_cleanup;
+
+ /* Local state for the eliminate domwalk. */
+ auto_vec<gimple *> to_remove;
+ auto_vec<gimple *> to_fixup;
+ auto_vec<tree> avail;
+ auto_vec<tree> avail_stack;
+};
+
+/* Adaptor to the elimination engine using RPO availability. */
+
+class rpo_elim : public eliminate_dom_walker
+{
+public:
+ rpo_elim(basic_block entry_)
+ : eliminate_dom_walker (CDI_DOMINATORS, NULL), entry (entry_) {}
+ ~rpo_elim();
+
+ virtual tree eliminate_avail (basic_block, tree op);
+
+ virtual void eliminate_push_avail (basic_block, tree);
+
+ basic_block entry;
+ /* Instead of having a local availability lattice for each
+ basic-block and availability at X defined as union of
+ the local availabilities at X and its dominators we're
+ turning this upside down and track availability per
+ value given values are usually made available at very
+ few points (at least one).
+ So we have a value -> vec<location, leader> map where
+ LOCATION is specifying the basic-block LEADER is made
+ available for VALUE. We push to this vector in RPO
+ order thus for iteration we can simply pop the last
+ entries.
+ LOCATION is the basic-block index and LEADER is its
+ SSA name version. */
+ /* ??? We'd like to use auto_vec here with embedded storage
+ but that doesn't play well until we can provide move
+ constructors and use std::move on hash-table expansion.
+ So for now this is a bit more expensive than necessary.
+ We eventually want to switch to a chaining scheme like
+ for hashtable entries for unwinding which would make
+ making the vector part of the vn_ssa_aux structure possible. */
+ typedef hash_map<tree, vec<std::pair<int, int> > > rpo_avail_t;
+ rpo_avail_t m_rpo_avail;
+};
+
+/* Global RPO state for access from hooks. */
+static rpo_elim *rpo_avail;
basic_block vn_context_bb;
/* Callback for walk_non_aliased_vuses. Tries to perform a lookup
ops[0] = vn_nary_op_lookup_pieces
(2, gimple_assign_rhs_code (def), type, ops, NULL);
/* We have wider operation available. */
- if (ops[0])
+ if (ops[0]
+ /* If the leader is a wrapping operation we can
+ insert it for code hoisting w/o introducing
+ undefined overflow. If it is not it has to
+ be available. See PR86554. */
+ && (TYPE_OVERFLOW_WRAPS (TREE_TYPE (ops[0]))
+ || (rpo_avail && vn_context_bb
+ && rpo_avail->eliminate_avail (vn_context_bb,
+ ops[0]))))
{
unsigned lhs_prec = TYPE_PRECISION (type);
unsigned rhs_prec = TYPE_PRECISION (TREE_TYPE (rhs1));
return false;
}
-
-class eliminate_dom_walker : public dom_walker
-{
-public:
- eliminate_dom_walker (cdi_direction, bitmap);
- ~eliminate_dom_walker ();
-
- virtual edge before_dom_children (basic_block);
- virtual void after_dom_children (basic_block);
-
- virtual tree eliminate_avail (basic_block, tree op);
- virtual void eliminate_push_avail (basic_block, tree op);
- tree eliminate_insert (basic_block, gimple_stmt_iterator *gsi, tree val);
-
- void eliminate_stmt (basic_block, gimple_stmt_iterator *);
-
- unsigned eliminate_cleanup (bool region_p = false);
-
- bool do_pre;
- unsigned int el_todo;
- unsigned int eliminations;
- unsigned int insertions;
-
- /* SSA names that had their defs inserted by PRE if do_pre. */
- bitmap inserted_exprs;
-
- /* Blocks with statements that have had their EH properties changed. */
- bitmap need_eh_cleanup;
-
- /* Blocks with statements that have had their AB properties changed. */
- bitmap need_ab_cleanup;
-
- /* Local state for the eliminate domwalk. */
- auto_vec<gimple *> to_remove;
- auto_vec<gimple *> to_fixup;
- auto_vec<tree> avail;
- auto_vec<tree> avail_stack;
-};
-
eliminate_dom_walker::eliminate_dom_walker (cdi_direction direction,
bitmap inserted_exprs_)
: dom_walker (direction), do_pre (inserted_exprs_ != NULL),
BITMAP_FREE (constant_value_ids);
}
-/* Adaptor to the elimination engine using RPO availability. */
-
-class rpo_elim : public eliminate_dom_walker
-{
-public:
- rpo_elim(basic_block entry_)
- : eliminate_dom_walker (CDI_DOMINATORS, NULL), entry (entry_) {}
- ~rpo_elim();
-
- virtual tree eliminate_avail (basic_block, tree op);
-
- virtual void eliminate_push_avail (basic_block, tree);
-
- basic_block entry;
- /* Instead of having a local availability lattice for each
- basic-block and availability at X defined as union of
- the local availabilities at X and its dominators we're
- turning this upside down and track availability per
- value given values are usually made available at very
- few points (at least one).
- So we have a value -> vec<location, leader> map where
- LOCATION is specifying the basic-block LEADER is made
- available for VALUE. We push to this vector in RPO
- order thus for iteration we can simply pop the last
- entries.
- LOCATION is the basic-block index and LEADER is its
- SSA name version. */
- /* ??? We'd like to use auto_vec here with embedded storage
- but that doesn't play well until we can provide move
- constructors and use std::move on hash-table expansion.
- So for now this is a bit more expensive than necessary.
- We eventually want to switch to a chaining scheme like
- for hashtable entries for unwinding which would make
- making the vector part of the vn_ssa_aux structure possible. */
- typedef hash_map<tree, vec<std::pair<int, int> > > rpo_avail_t;
- rpo_avail_t m_rpo_avail;
-};
-
-/* Global RPO state for access from hooks. */
-static rpo_elim *rpo_avail;
-
/* Hook for maybe_push_res_to_seq, lookup the expression in the VN tables. */
static tree
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