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tree-ssa-dom.c (const_and_copies_stack): New.

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* tree-ssa-dom.c (const_and_copies_stack): New.
	(dom_walk_block_data): Remove const_and_copies field.
	(record_const_or_copy): No longer need to pass in varray_type *.
	Use CONST_AND_COPIES_STACK rather than passed in block local stack.
	Callers updated.
	(record_equality): Similarly.
	(restore_vars_to_original_value): Similarly.  Revamp to use new
	single global stack rather than per-block stacks.
	(tree_ssa_dominator_optimize): Initialize the CONST_AND_COPIES_STACK.
	(thread_across_edge): Remove now unused parameters.
	(dom_opt_initialize_block_local_data): No longer test the block
	local CONST_AND_COPIES.
	(dom_opt_initialize_block): Push a marker on CONST_AND_COPIES_STACK.

From-SVN: r87670
This commit is contained in:
Jeff Law 2004-09-17 15:16:07 -06:00 committed by Jeff Law
parent 2c459e7487
commit b5fefcf63d
2 changed files with 56 additions and 54 deletions
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16
gcc/ChangeLog
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@ -1,3 +1,19 @@
2004-09-17 Jeff Law <law@redhat.com>
* tree-ssa-dom.c (const_and_copies_stack): New.
(dom_walk_block_data): Remove const_and_copies field.
(record_const_or_copy): No longer need to pass in varray_type *.
Use CONST_AND_COPIES_STACK rather than passed in block local stack.
Callers updated.
(record_equality): Similarly.
(restore_vars_to_original_value): Similarly. Revamp to use new
single global stack rather than per-block stacks.
(tree_ssa_dominator_optimize): Initialize the CONST_AND_COPIES_STACK.
(thread_across_edge): Remove now unused parameters.
(dom_opt_initialize_block_local_data): No longer test the block
local CONST_AND_COPIES.
(dom_opt_initialize_block): Push a marker on CONST_AND_COPIES_STACK.
2004-09-17 Jan Hubicka <jh@suse.cz>
PR tree-optimization/17509

94
gcc/tree-ssa-dom.c
View File

@ -119,6 +119,12 @@ struct expr_hash_elt
propagation). */
static varray_type const_and_copies;
/* Stack of dest,src pairs that need to be restored during finalization.
A NULL entry is used to mark the end of pairs which need to be
restored during finalization of this block. */
static varray_type const_and_copies_stack;
/* Bitmap of SSA_NAMEs known to have a nonzero value, even if we do not
know their exact value. */
static bitmap nonzero_vars;
@ -201,10 +207,6 @@ static varray_type vrp_data;
struct dom_walk_block_data
{
/* Array of dest, src pairs that need to be restored during finalization
into the global const/copies table during finalization. */
varray_type const_and_copies;
/* Similarly for the nonzero state of variables that needs to be
restored during finalization. */
varray_type nonzero_vars;
@ -236,8 +238,8 @@ static int avail_expr_eq (const void *, const void *);
static void htab_statistics (FILE *, htab_t);
static void record_cond (tree, tree);
static void record_dominating_conditions (tree);
static void record_const_or_copy (tree, tree, varray_type *);
static void record_equality (tree, tree, varray_type *);
static void record_const_or_copy (tree, tree);
static void record_equality (tree, tree);
static tree update_rhs_and_lookup_avail_expr (tree, tree, bool);
static tree simplify_rhs_and_lookup_avail_expr (struct dom_walk_data *,
tree, int);
@ -260,9 +262,7 @@ static void dom_opt_initialize_block_local_data (struct dom_walk_data *,
static void dom_opt_initialize_block (struct dom_walk_data *, basic_block);
static void cprop_into_phis (struct dom_walk_data *, basic_block);
static void remove_local_expressions_from_table (void);
static void restore_vars_to_original_value (varray_type locals,
unsigned limit,
varray_type table);
static void restore_vars_to_original_value (void);
static void restore_currdefs_to_original_value (void);
static void register_definitions_for_stmt (tree);
static edge single_incoming_edge_ignoring_loop_edges (basic_block);
@ -323,6 +323,7 @@ tree_ssa_dominator_optimize (void)
VARRAY_TREE_INIT (avail_exprs_stack, 20, "Available expression stack");
VARRAY_TREE_INIT (block_defs_stack, 20, "Block DEFS stack");
VARRAY_TREE_INIT (const_and_copies, num_ssa_names, "const_and_copies");
VARRAY_TREE_INIT (const_and_copies_stack, 20, "Block const_and_copies stack");
nonzero_vars = BITMAP_XMALLOC ();
VARRAY_GENERIC_PTR_INIT (vrp_data, num_ssa_names, "vrp_data");
need_eh_cleanup = BITMAP_XMALLOC ();
@ -457,8 +458,6 @@ struct tree_opt_pass pass_dominator =
static void
thread_across_edge (struct dom_walk_data *walk_data, edge e)
{
struct dom_walk_block_data *bd
= VARRAY_TOP_GENERIC_PTR (walk_data->block_data_stack);
block_stmt_iterator bsi;
tree stmt = NULL;
tree phi;
@ -468,7 +467,7 @@ thread_across_edge (struct dom_walk_data *walk_data, edge e)
{
tree src = PHI_ARG_DEF_FROM_EDGE (phi, e);
tree dst = PHI_RESULT (phi);
record_const_or_copy (dst, src, &bd->const_and_copies);
record_const_or_copy (dst, src);
register_new_def (dst, &block_defs_stack);
}
@ -583,7 +582,7 @@ thread_across_edge (struct dom_walk_data *walk_data, edge e)
We want to record an equivalence lhs = cache_lhs so that if
the result of this statement is used later we can copy propagate
suitably. */
record_const_or_copy (lhs, cached_lhs, &bd->const_and_copies);
record_const_or_copy (lhs, cached_lhs);
register_new_def (lhs, &block_defs_stack);
}
@ -737,8 +736,6 @@ dom_opt_initialize_block_local_data (struct dom_walk_data *walk_data ATTRIBUTE_U
make sure we clear them before using them! */
if (recycled)
{
gcc_assert (!bd->const_and_copies
|| VARRAY_ACTIVE_SIZE (bd->const_and_copies) == 0);
gcc_assert (!bd->nonzero_vars
|| VARRAY_ACTIVE_SIZE (bd->nonzero_vars) == 0);
gcc_assert (!bd->vrp_variables
@ -760,6 +757,7 @@ dom_opt_initialize_block (struct dom_walk_data *walk_data, basic_block bb)
far to unwind when we finalize this block. */
VARRAY_PUSH_TREE (avail_exprs_stack, NULL_TREE);
VARRAY_PUSH_TREE (block_defs_stack, NULL_TREE);
VARRAY_PUSH_TREE (const_and_copies_stack, NULL_TREE);
record_equivalences_from_incoming_edge (walk_data, bb);
@ -849,27 +847,27 @@ restore_nonzero_vars_to_original_value (varray_type locals,
}
}
/* Use the source/dest pairs in LOCALS to restore TABLE to its original
state, stopping when there are LIMIT entries left in LOCALs. */
/* Use the source/dest pairs in CONST_AND_COPIES_STACK to restore
CONST_AND_COPIES to its original state, stopping when we hit a
NULL marker. */
static void
restore_vars_to_original_value (varray_type locals,
unsigned limit,
varray_type table)
restore_vars_to_original_value (void)
{
if (! locals)
return;
while (VARRAY_ACTIVE_SIZE (locals) > limit)
while (VARRAY_ACTIVE_SIZE (const_and_copies_stack) > 0)
{
tree prev_value, dest;
prev_value = VARRAY_TOP_TREE (locals);
VARRAY_POP (locals);
dest = VARRAY_TOP_TREE (locals);
VARRAY_POP (locals);
dest = VARRAY_TOP_TREE (const_and_copies_stack);
VARRAY_POP (const_and_copies_stack);
set_value_for (dest, prev_value, table);
if (dest == NULL)
break;
prev_value = VARRAY_TOP_TREE (const_and_copies_stack);
VARRAY_POP (const_and_copies_stack);
set_value_for (dest, prev_value, const_and_copies);
}
}
@ -959,16 +957,12 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
if (get_immediate_dominator (CDI_DOMINATORS, true_edge->dest) != bb
|| phi_nodes (true_edge->dest))
{
unsigned const_and_copies_limit;
const_and_copies_limit
= bd->const_and_copies ? VARRAY_ACTIVE_SIZE (bd->const_and_copies)
: 0;
/* Push a marker onto the available expression stack so that we
unwind any expressions related to the TRUE arm before processing
the false arm below. */
VARRAY_PUSH_TREE (avail_exprs_stack, NULL_TREE);
VARRAY_PUSH_TREE (block_defs_stack, NULL_TREE);
VARRAY_PUSH_TREE (const_and_copies_stack, NULL_TREE);
/* Record any equivalences created by following this edge. */
if (TREE_CODE_CLASS (cond_code) == '<')
@ -978,8 +972,7 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
record_cond (inverted, boolean_false_node);
}
else if (cond_code == SSA_NAME)
record_const_or_copy (cond, boolean_true_node,
&bd->const_and_copies);
record_const_or_copy (cond, boolean_true_node);
/* Now thread the edge. */
thread_across_edge (walk_data, true_edge);
@ -987,9 +980,7 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
/* And restore the various tables to their state before
we threaded this edge. */
remove_local_expressions_from_table ();
restore_vars_to_original_value (bd->const_and_copies,
const_and_copies_limit,
const_and_copies);
restore_vars_to_original_value ();
restore_currdefs_to_original_value ();
}
@ -1005,8 +996,7 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
record_dominating_conditions (inverted);
}
else if (cond_code == SSA_NAME)
record_const_or_copy (cond, boolean_false_node,
&bd->const_and_copies);
record_const_or_copy (cond, boolean_false_node);
thread_across_edge (walk_data, false_edge);
@ -1018,7 +1008,7 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
remove_local_expressions_from_table ();
restore_nonzero_vars_to_original_value (bd->nonzero_vars, 0, nonzero_vars);
restore_vars_to_original_value (bd->const_and_copies, 0, const_and_copies);
restore_vars_to_original_value ();
restore_currdefs_to_original_value ();
/* Remove VRP records associated with this basic block. They are no
@ -1282,8 +1272,7 @@ record_equivalences_from_incoming_edge (struct dom_walk_data *walk_data,
new value for VAR, so that occurrences of VAR can be replaced with
VALUE while re-writing the THEN arm of a COND_EXPR. */
if (eq_expr_value.src && eq_expr_value.dst)
record_equality (eq_expr_value.dst, eq_expr_value.src,
&bd->const_and_copies);
record_equality (eq_expr_value.dst, eq_expr_value.src);
}
/* Dump SSA statistics on FILE. */
@ -1527,22 +1516,19 @@ record_dominating_conditions (tree cond)
Do the work of recording the value and undo info. */
static void
record_const_or_copy_1 (tree x, tree y, tree prev_x,
varray_type *block_const_and_copies_p)
record_const_or_copy_1 (tree x, tree y, tree prev_x)
{
set_value_for (x, y, const_and_copies);
if (!*block_const_and_copies_p)
VARRAY_TREE_INIT (*block_const_and_copies_p, 2, "block_const_and_copies");
VARRAY_PUSH_TREE (*block_const_and_copies_p, x);
VARRAY_PUSH_TREE (*block_const_and_copies_p, prev_x);
VARRAY_PUSH_TREE (const_and_copies_stack, prev_x);
VARRAY_PUSH_TREE (const_and_copies_stack, x);
}
/* Record that X is equal to Y in const_and_copies. Record undo
information in the block-local varray. */
static void
record_const_or_copy (tree x, tree y, varray_type *block_const_and_copies_p)
record_const_or_copy (tree x, tree y)
{
tree prev_x = get_value_for (x, const_and_copies);
@ -1553,14 +1539,14 @@ record_const_or_copy (tree x, tree y, varray_type *block_const_and_copies_p)
y = tmp;
}
record_const_or_copy_1 (x, y, prev_x, block_const_and_copies_p);
record_const_or_copy_1 (x, y, prev_x);
}
/* Similarly, but assume that X and Y are the two operands of an EQ_EXPR.
This constrains the cases in which we may treat this as assignment. */
static void
record_equality (tree x, tree y, varray_type *block_const_and_copies_p)
record_equality (tree x, tree y)
{
tree prev_x = NULL, prev_y = NULL;
@ -1594,7 +1580,7 @@ record_equality (tree x, tree y, varray_type *block_const_and_copies_p)
|| REAL_VALUES_EQUAL (dconst0, TREE_REAL_CST (y))))
return;
record_const_or_copy_1 (x, y, prev_x, block_const_and_copies_p);
record_const_or_copy_1 (x, y, prev_x);
}
/* STMT is a MODIFY_EXPR for which we were unable to find RHS in the