}
/* Assigns the address of OBJ in TYPE to an ssa name, and returns this name.
- The assignment statement is placed before LOOP. DECL_ADDRESS maps decls
+ The assignment statement is placed on edge ENTRY. DECL_ADDRESS maps decls
to their addresses that can be reused. The address of OBJ is known to
be invariant in the whole function. */
static tree
-take_address_of (tree obj, tree type, struct loop *loop, htab_t decl_address)
+take_address_of (tree obj, tree type, edge entry, htab_t decl_address)
{
int uid;
void **dslot;
struct int_tree_map ielt, *nielt;
tree *var_p, name, bvar, stmt, addr;
- edge entry = loop_preheader_edge (loop);
/* Since the address of OBJ is invariant, the trees may be shared.
Avoid rewriting unrelated parts of the code. */
struct elv_data
{
- struct loop *loop;
+ edge entry;
htab_t decl_address;
bool changed;
};
-/* Eliminates references to local variables in *TP out of LOOP. DECL_ADDRESS
- contains addresses of the references that had their address taken already.
- If the expression is changed, CHANGED is set to true. Callback for
- walk_tree. */
+/* Eliminates references to local variables in *TP out of the single
+ entry single exit region starting at DTA->ENTRY.
+ DECL_ADDRESS contains addresses of the references that had their
+ address taken already. If the expression is changed, CHANGED is
+ set to true. Callback for walk_tree. */
static tree
eliminate_local_variables_1 (tree *tp, int *walk_subtrees, void *data)
type = TREE_TYPE (t);
addr_type = build_pointer_type (type);
- addr = take_address_of (t, addr_type, dta->loop, dta->decl_address);
+ addr = take_address_of (t, addr_type, dta->entry, dta->decl_address);
*tp = build1 (INDIRECT_REF, TREE_TYPE (*tp), addr);
dta->changed = true;
return NULL_TREE;
addr_type = TREE_TYPE (t);
- addr = take_address_of (obj, addr_type, dta->loop, dta->decl_address);
+ addr = take_address_of (obj, addr_type, dta->entry, dta->decl_address);
*tp = addr;
dta->changed = true;
return NULL_TREE;
}
-/* Moves the references to local variables in STMT from LOOP. DECL_ADDRESS
- contains addresses for the references for that we have already taken
- them. */
+/* Moves the references to local variables in STMT out of the single
+ entry single exit region starting at ENTRY. DECL_ADDRESS contains
+ addresses of the references that had their address taken
+ already. */
static void
-eliminate_local_variables_stmt (struct loop *loop, tree stmt,
+eliminate_local_variables_stmt (edge entry, tree stmt,
htab_t decl_address)
{
struct elv_data dta;
- dta.loop = loop;
+ dta.entry = entry;
dta.decl_address = decl_address;
dta.changed = false;
update_stmt (stmt);
}
-/* Eliminates the references to local variables from LOOP.
+/* Eliminates the references to local variables from the single entry
+ single exit region between the ENTRY and EXIT edges.
+
This includes:
1) Taking address of a local variable -- these are moved out of the
- loop (and temporary variable is created to hold the address if
+ region (and temporary variable is created to hold the address if
necessary).
+
2) Dereferencing a local variable -- these are replaced with indirect
references. */
static void
-eliminate_local_variables (struct loop *loop)
+eliminate_local_variables (edge entry, edge exit)
{
- basic_block bb, *body = get_loop_body (loop);
+ basic_block bb;
+ VEC (basic_block, heap) *body = VEC_alloc (basic_block, heap, 3);
unsigned i;
block_stmt_iterator bsi;
htab_t decl_address = htab_create (10, int_tree_map_hash, int_tree_map_eq,
free);
+ basic_block entry_bb = entry->src;
+ basic_block exit_bb = exit->dest;
- /* Find and rename the ssa names defined outside of loop. */
- for (i = 0; i < loop->num_nodes; i++)
- {
- bb = body[i];
+ gather_blocks_in_sese_region (entry_bb, exit_bb, &body);
+ for (i = 0; VEC_iterate (basic_block, body, i, bb); i++)
+ if (bb != entry_bb && bb != exit_bb)
for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
- eliminate_local_variables_stmt (loop, bsi_stmt (bsi), decl_address);
- }
+ eliminate_local_variables_stmt (entry, bsi_stmt (bsi),
+ decl_address);
htab_delete (decl_address);
+ VEC_free (basic_block, heap, body);
+}
+
+/* Returns true if expression EXPR is not defined between ENTRY and
+ EXIT, i.e. if all its operands are defined outside of the region. */
+
+static bool
+expr_invariant_in_region_p (edge entry, edge exit, tree expr)
+{
+ basic_block entry_bb = entry->src;
+ basic_block exit_bb = exit->dest;
+ basic_block def_bb;
+ unsigned i, len;
+
+ if (is_gimple_min_invariant (expr))
+ return true;
+
+ if (TREE_CODE (expr) == SSA_NAME)
+ {
+ def_bb = bb_for_stmt (SSA_NAME_DEF_STMT (expr));
+ if (def_bb
+ && dominated_by_p (CDI_DOMINATORS, def_bb, entry_bb)
+ && !dominated_by_p (CDI_DOMINATORS, def_bb, exit_bb))
+ return false;
+
+ return true;
+ }
+
+ if (!EXPR_P (expr) && !GIMPLE_STMT_P (expr))
+ return false;
+
+ len = TREE_OPERAND_LENGTH (expr);
+ for (i = 0; i < len; i++)
+ if (!expr_invariant_in_region_p (entry, exit, TREE_OPERAND (expr, i)))
+ return false;
+
+ return true;
}
/* If COPY_NAME_P is true, creates and returns a duplicate of NAME.
duplicated, storing the copies in DECL_COPIES. */
static tree
-separate_decls_in_loop_name (tree name,
- htab_t name_copies, htab_t decl_copies,
- bool copy_name_p)
+separate_decls_in_region_name (tree name,
+ htab_t name_copies, htab_t decl_copies,
+ bool copy_name_p)
{
tree copy, var, var_copy;
unsigned idx, uid, nuid;
return copy;
}
-/* Finds the ssa names used in STMT that are defined outside of LOOP and
- replaces such ssa names with their duplicates. The duplicates are stored to
- NAME_COPIES. Base decls of all ssa names used in STMT
- (including those defined in LOOP) are replaced with the new temporary
- variables; the replacement decls are stored in DECL_COPIES. */
+/* Finds the ssa names used in STMT that are defined outside the
+ region between ENTRY and EXIT and replaces such ssa names with
+ their duplicates. The duplicates are stored to NAME_COPIES. Base
+ decls of all ssa names used in STMT (including those defined in
+ LOOP) are replaced with the new temporary variables; the
+ replacement decls are stored in DECL_COPIES. */
static void
-separate_decls_in_loop_stmt (struct loop *loop, tree stmt,
- htab_t name_copies, htab_t decl_copies)
+separate_decls_in_region_stmt (edge entry, edge exit, tree stmt,
+ htab_t name_copies, htab_t decl_copies)
{
use_operand_p use;
def_operand_p def;
{
name = DEF_FROM_PTR (def);
gcc_assert (TREE_CODE (name) == SSA_NAME);
- copy = separate_decls_in_loop_name (name, name_copies, decl_copies,
- false);
+ copy = separate_decls_in_region_name (name, name_copies, decl_copies,
+ false);
gcc_assert (copy == name);
}
if (TREE_CODE (name) != SSA_NAME)
continue;
- copy_name_p = expr_invariant_in_loop_p (loop, name);
- copy = separate_decls_in_loop_name (name, name_copies, decl_copies,
- copy_name_p);
+ copy_name_p = expr_invariant_in_region_p (entry, exit, name);
+ copy = separate_decls_in_region_name (name, name_copies, decl_copies,
+ copy_name_p);
SET_USE (use, copy);
}
}
in LOOP. */
static void
-separate_decls_in_loop (struct loop *loop, htab_t reduction_list,
- tree * arg_struct, tree * new_arg_struct,
- struct clsn_data *ld_st_data)
+separate_decls_in_region (edge entry, edge exit, htab_t reduction_list,
+ tree *arg_struct, tree *new_arg_struct,
+ struct clsn_data *ld_st_data)
{
- basic_block bb1 = split_edge (loop_preheader_edge (loop));
+ basic_block bb1 = split_edge (entry);
basic_block bb0 = single_pred (bb1);
htab_t name_copies = htab_create (10, name_to_copy_elt_hash,
name_to_copy_elt_eq, free);
htab_t decl_copies = htab_create (10, int_tree_map_hash, int_tree_map_eq,
free);
- basic_block bb, *body = get_loop_body (loop);
unsigned i;
tree phi, type, type_name, nvar;
block_stmt_iterator bsi;
struct clsn_data clsn_data;
+ VEC (basic_block, heap) *body = VEC_alloc (basic_block, heap, 3);
+ basic_block bb;
+ basic_block entry_bb = bb1;
+ basic_block exit_bb = exit->dest;
- /* Find and rename the ssa names defined outside of loop. */
- for (i = 0; i < loop->num_nodes; i++)
- {
- bb = body[i];
-
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
- separate_decls_in_loop_stmt (loop, phi, name_copies, decl_copies);
+ entry = single_succ_edge(entry_bb);
+ gather_blocks_in_sese_region (entry_bb, exit_bb, &body);
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
- separate_decls_in_loop_stmt (loop, bsi_stmt (bsi), name_copies,
- decl_copies);
+ for (i = 0; VEC_iterate (basic_block, body, i, bb); i++)
+ {
+ if (bb != entry_bb && bb != exit_bb)
+ {
+ for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
+ separate_decls_in_region_stmt (entry, exit, phi, name_copies,
+ decl_copies);
+
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ separate_decls_in_region_stmt (entry, exit, bsi_stmt (bsi),
+ name_copies, decl_copies);
+ }
}
- free (body);
+
+ VEC_free (basic_block, heap, body);
if (htab_elements (name_copies) == 0)
{
TYPE_NAME (type) = type_name;
htab_traverse (name_copies, add_field_for_name, type);
- if (htab_elements (reduction_list) > 0)
+ if (reduction_list && htab_elements (reduction_list) > 0)
{
/* Create the fields for reductions. */
htab_traverse (reduction_list, add_field_for_reduction,
/* Load the calculation from memory (after the join of the threads). */
- if (htab_elements (reduction_list) > 0)
+ if (reduction_list && htab_elements (reduction_list) > 0)
{
htab_traverse (reduction_list, create_stores_for_reduction,
ld_st_data);
clsn_data.load = make_ssa_name (nvar, NULL_TREE);
- clsn_data.load_bb = single_dom_exit (loop)->dest;
+ clsn_data.load_bb = exit->dest;
clsn_data.store = ld_st_data->store;
create_final_loads_for_reduction (reduction_list, &clsn_data);
}
tree many_iterations_cond, type, nit;
tree stmts, arg_struct, new_arg_struct;
basic_block parallel_head;
+ edge entry, exit;
struct clsn_data clsn_data;
unsigned prob;
/* Ensure that the exit condition is the first statement in the loop. */
transform_to_exit_first_loop (loop, reduction_list, nit);
-
/* Generate intializations for reductions. */
-
if (htab_elements (reduction_list) > 0)
htab_traverse (reduction_list, initialize_reductions, loop);
/* Eliminate the references to local variables from the loop. */
- eliminate_local_variables (loop);
+ gcc_assert (single_exit (loop));
+ entry = loop_preheader_edge (loop);
+ exit = single_dom_exit (loop);
+ eliminate_local_variables (entry, exit);
/* In the old loop, move all variables non-local to the loop to a structure
and back, and create separate decls for the variables used in loop. */
- separate_decls_in_loop (loop, reduction_list, &arg_struct, &new_arg_struct, &clsn_data);
+ separate_decls_in_region (entry, exit, reduction_list, &arg_struct,
+ &new_arg_struct, &clsn_data);
/* Create the parallel constructs. */
parallel_head = create_parallel_loop (loop, create_loop_fn (), arg_struct,
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